Move the action from Deno to Node.js and Vite+

2026-10-16 02:20:49 +09:00
parent 9b55e98d8c
commit 8f23da2b42
45 changed files with 5664 additions and 1731 deletions
@@ -5,17 +5,18 @@ on:
    branches: [main]

 jobs:
-  deno:
+  check:
    runs-on: self-hosted
    steps:
      - uses: actions/checkout@v4

-      - run: apt-get update && apt-get install -y unzip
+      # The action runs on this same image; src/post.ts needs Node 24.2+.
+      - run: node --version

-      - uses: denoland/setup-deno@v2
+      - run: npm ci

-      - run: >-
-          deno fmt --check . &&
-          deno lint . &&
-          deno check src/prepare.ts src/run.ts src/post.ts &&
-          deno test --allow-all
+      # Formatting, lint, and type checks, then every test. The job runs as
+      # root, so the isolation tests run rather than skip.
+      - run: npx vp check
+
+      - run: npx vp test
@@ -0,0 +1,2 @@
+node_modules/
+coverage/
@@ -10,6 +10,21 @@ comment `@bot` to request an AI-bot review. Wait for green CI and the bot's
 approval on the current head before merging. Never merge without the user's
 explicit permission.

-Repository TypeScript and checks use Deno. The composite action uses npm only to
-install the externally distributed Claude Code and Codex command-line tools; do
-not treat those vendor executables as repository TypeScript dependencies.
+# Runtime and checks
+
+The action's TypeScript runs directly on the job image's Node.js (24.2 or
+newer), which strips the types itself: there is no build step and no runtime
+dependency. Keep the sources to erasable syntax and `.ts` imports, which
+`tsconfig.json` enforces. Checks use Vite+: `vp check` formats, lints, and
+type-checks, and `vp test` runs Vitest. Unit tests sit next to the code as
+`src/*.test.ts`; repository-level tests live in `tests/`.
+
+The only config files are `package.json`, `tsconfig.json`, and
+`vite.config.ts`, plus `package-lock.json`. Repo-local lint rules and the rule
+list live in `scripts/project-lint.ts`. Lint disable comments are not allowed;
+fix the source instead.
+
+The composite action uses npm only to install the externally distributed
+Claude Code, Codex, and OpenCode command-line tools, plus Deno for agents that
+check Deno-based repositories; do not treat those vendor executables as
+repository TypeScript dependencies.
@@ -15,7 +15,9 @@ runs:
      with:
        fetch-depth: 0
        token: ${{ gitea.token }}
-    # This step assumes this is `node:24-bookworm` container.
+    # This step assumes this is `node:24-bookworm` container. The action runs
+    # its TypeScript on that Node directly; Deno stays for the agents, which
+    # still check Deno-based repositories with it.
    - name: Install dependencies
      shell: bash
      run: npm install -g @openai/codex @anthropic-ai/claude-code opencode-ai deno
@@ -34,7 +36,7 @@ runs:
    - name: Prepare credentials
      id: prepare
      shell: bash
-      run: deno run -A "${{ steps.source.outputs.path }}/src/prepare.ts"
+      run: node "${{ steps.source.outputs.path }}/src/prepare.ts"
      env:
        ACTION_PATH: ${{ steps.source.outputs.path }}
        BOT_AGENTS_MASTER_KEY: ${{ inputs.master-key }}
@@ -42,7 +44,7 @@ runs:
    - name: Run bot
      id: agent
      shell: bash
-      run: deno run -A "${{ steps.source.outputs.path }}/src/run.ts"
+      run: node "${{ steps.source.outputs.path }}/src/run.ts"
      env:
        BOT_AGENTS_MANIFEST: ${{ steps.prepare.outputs.manifest }}
        GITEA_TOKEN: ${{ gitea.token }}
@@ -55,7 +57,7 @@ runs:
      id: post
      if: always() && steps.prepare.outputs.manifest != ''
      shell: bash
-      run: deno run -A "${{ steps.source.outputs.path }}/src/post.ts"
+      run: node "${{ steps.source.outputs.path }}/src/post.ts"
      env:
        BOT_AGENTS_MANIFEST: ${{ steps.prepare.outputs.manifest }}
        GITEA_API_URL: ${{ gitea.api_url }}
@@ -0,0 +1,16 @@
+{
+  "name": "bot-agents",
+  "description": "A Gitea composite action that runs a coding agent for approved issue and pull request automation.",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=24.2"
+  },
+  "devDependencies": {
+    "@eslint/core": "^0.17.0",
+    "@types/node": "^24.19.2",
+    "@typescript-eslint/types": "^8.71.2",
+    "vite-plus": "^1.2.0",
+    "yaml": "^2.9.1"
+  }
+}
@@ -0,0 +1,19 @@
+{
+  "reviewer-token": "v1:XFUvCI9PnXVaW-ig:_3S9BvXywUp29cVYGA_EzFScKwC5oHkV9x2Ld8k-V_uiG7iA8n3fmjXCArzh2Lz-JDgy3IMTHoY",
+  "profiles": [
+    {
+      "type": "codex",
+      "model": "gpt-5.6-terra"
+    },
+    {
+      "type": "claude",
+      "model": "claude-sonnet-5",
+      "token": "v1:-dyfF6ZicEhjPk4C:WCuMaGd09tYjtzUCl7abloRzPITvP5C35WpR372w3O_tcaD-ls-yV5sJBdU8iIVApZVCC98sY2gOyM3o9RMa8ciJq8Fuys7KxlYOp8QiluL9AYMSQi6rEsSH71EPWnxSACgo3uDQY8bWQpUlEZvXH9O-ZN9A58dh6b3vRg"
+    },
+    {
+      "type": "opencode",
+      "model": "openrouter/qwen/qwen3.8-27b",
+      "token": "v1:4qdfJCdUx9jfiabC:8X0ic_J82lPlq_R3uTLaEbQy7UmEh7BgtG0bDKAcc8FeJ0xvEwkGCKaDoLmT5nta03hgjGdcWKjDdOSMi1kSDfp8J7tRTLtMRzDT8GX8OU_PVDPVahQIAU0"
+    }
+  ]
+}
@@ -1,10 +0,0 @@
-reviewer-token: v1:XFUvCI9PnXVaW-ig:_3S9BvXywUp29cVYGA_EzFScKwC5oHkV9x2Ld8k-V_uiG7iA8n3fmjXCArzh2Lz-JDgy3IMTHoY
-profiles:
-  - type: codex
-    model: gpt-5.6-terra
-  - type: claude
-    model: claude-sonnet-5
-    token: v1:-dyfF6ZicEhjPk4C:WCuMaGd09tYjtzUCl7abloRzPITvP5C35WpR372w3O_tcaD-ls-yV5sJBdU8iIVApZVCC98sY2gOyM3o9RMa8ciJq8Fuys7KxlYOp8QiluL9AYMSQi6rEsSH71EPWnxSACgo3uDQY8bWQpUlEZvXH9O-ZN9A58dh6b3vRg
-  - type: opencode
-    model: openrouter/qwen/qwen3.8-27b
-    token: v1:4qdfJCdUx9jfiabC:8X0ic_J82lPlq_R3uTLaEbQy7UmEh7BgtG0bDKAcc8FeJ0xvEwkGCKaDoLmT5nta03hgjGdcWKjDdOSMi1kSDfp8J7tRTLtMRzDT8GX8OU_PVDPVahQIAU0
@@ -0,0 +1,232 @@
+/**
+ * `project` — lint rules this repository holds its own source to. Deno lint
+ * ran here with its `recommended` rules and no plugins; the Oxlint categories
+ * in `vite.config.ts` plus the rule list below keep at least that coverage.
+ * Its rules of its own are `no-disable-comments` and `no-non-ts-imports`.
+ *
+ * Loaded by `vite.config.ts` as an Oxlint `jsPlugins` entry.
+ *
+ * @module
+ */
+
+import type { LanguageOptions, RuleDefinition, RuleVisitor, TextSourceCode } from "@eslint/core";
+import type { TSESTree } from "@typescript-eslint/types";
+import type { DummyRuleMap } from "vite-plus/lint";
+
+/** The source code both hosts hand a rule, with the comment list. */
+interface ProjectSourceCode extends TextSourceCode {
+  getAllComments(): TSESTree.Comment[];
+}
+
+/** ESLint's default rule types, reporting TypeScript-ESTree nodes. */
+interface ProjectRuleTypes {
+  LangOptions: LanguageOptions;
+  Code: ProjectSourceCode;
+  RuleOptions: [];
+  Visitor: RuleVisitor;
+  Node: TSESTree.Node;
+  MessageIds: string;
+  ExtRuleDocs: unknown;
+}
+
+/** A repo-local rule, in ESLint's standard `create` form. */
+type ProjectRule = RuleDefinition<ProjectRuleTypes>;
+
+/** A comment that turns lint rules off or back on, in ESLint or Oxlint form. */
+const DIRECTIVE_PATTERN: RegExp = /^\s*(?:eslint|oxlint)-(?:disable|enable)/u;
+
+/** This rule's own name, which a directive may not use to silence it. */
+const RULE_NAME: string = "no-disable-comments";
+
+/**
+ * `no-disable-comments` — rejects every `eslint-disable*`, `eslint-enable*`,
+ * `oxlint-disable*`, and `oxlint-enable*` comment, line or block. Oxlint has
+ * no `noInlineConfig` and no `eslint-comments` rules, so this repo bans them
+ * itself: when a rule fires, fix the source.
+ *
+ * A directive can silence the report on itself, so two built-in checks close
+ * the gaps: `unicorn/no-abusive-eslint-disable` fails one that names no rule,
+ * and this rule skips one that names it, which then silences nothing and fails
+ * `reportUnusedDisableDirectives` in `vite.config.ts`.
+ */
+const noDisableCommentsRule: ProjectRule = {
+  meta: {
+    type: "problem",
+    docs: { description: "Disallow lint disable and enable comments" },
+    schema: [],
+    messages: { directive: "Lint disable comments are not allowed; fix the source." },
+  },
+  create(context) {
+    return {
+      Program(_node: TSESTree.Program): void {
+        for (const comment of context.sourceCode.getAllComments()) {
+          if (DIRECTIVE_PATTERN.test(comment.value) && !comment.value.includes(RULE_NAME)) {
+            context.report({ loc: comment.loc, messageId: "directive" });
+          }
+        }
+      },
+    };
+  },
+};
+
+/** A module specifier read as a path: relative, absolute, or a `#` alias. */
+const PATH_SPECIFIER_PATTERN: RegExp = /^[./#]/u;
+
+/**
+ * Whether `source` names something other than a `.ts` module: a query string
+ * such as `?raw`, or a final path segment with any other extension. Bare
+ * package names are left alone, dots and all, as are extensionless paths.
+ */
+function isNonTsSource(source: string): boolean {
+  if (source.includes("?")) {
+    return true;
+  }
+  const segments: string[] = source.split("/");
+  if (!PATH_SPECIFIER_PATTERN.test(source)) {
+    const nameLength: number = source.startsWith("@") ? 2 : 1;
+    if (segments.length <= nameLength) {
+      return false;
+    }
+  }
+  const lastSegment: string = segments.at(-1) ?? "";
+  if (lastSegment === "." || lastSegment === ".." || !lastSegment.includes(".")) {
+    return false;
+  }
+  return !lastSegment.endsWith(".ts");
+}
+
+/**
+ * `no-non-ts-imports` — rejects importing anything but a `.ts` module: a
+ * source path, static or a dynamic `import()` with a string literal, ending in
+ * another extension (`.css`, `.json`, `.svg`, `.js`, `.tsx`) or carrying a
+ * query string (`?raw`, `?url`), and any import or export with import
+ * attributes. Bare package names, `#` aliases, and `node:` builtins without an
+ * extension pass; package subpaths are checked like paths.
+ */
+const noNonTsImportsRule: ProjectRule = {
+  meta: {
+    type: "problem",
+    docs: { description: "Disallow importing modules other than .ts files" },
+    schema: [],
+    messages: {
+      extension: "Only .ts modules may be imported.",
+      attributes: "Import attributes are not allowed.",
+    },
+  },
+  create(context) {
+    function checkSource(source: TSESTree.StringLiteral): void {
+      if (isNonTsSource(source.value)) {
+        context.report({ node: source, messageId: "extension" });
+      }
+    }
+    function checkDeclaration(
+      node:
+        | TSESTree.ImportDeclaration
+        | TSESTree.ExportNamedDeclaration
+        | TSESTree.ExportAllDeclaration,
+    ): void {
+      if (node.source === null) {
+        return;
+      }
+      checkSource(node.source);
+      if (node.attributes.length > 0) {
+        context.report({ node, messageId: "attributes" });
+      }
+    }
+    return {
+      ImportDeclaration: checkDeclaration,
+      ExportNamedDeclaration: checkDeclaration,
+      ExportAllDeclaration: checkDeclaration,
+      ImportExpression(node: TSESTree.ImportExpression): void {
+        if (node.source.type === "Literal" && typeof node.source.value === "string") {
+          checkSource(node.source);
+        }
+        if (node.options !== null) {
+          context.report({ node, messageId: "attributes" });
+        }
+      },
+    };
+  },
+};
+
+/**
+ * This repository's own rule list, spread by `vite.config.ts`: Deno's
+ * `recommended` rules that sit outside the Oxlint categories, plus the
+ * template's extras. Built-in Oxlint rule ids sit here too, so
+ * `vite.config.ts` lists no rule by name.
+ */
+const rules: DummyRuleMap = {
+  // The explicit-types template's `camelcase` stand-in: no `_` inside a name
+  // once leading and trailing ones are trimmed, unless it has no lowercase
+  // ASCII letter (UPPER_SNAKE).
+  "id-match": [
+    "error",
+    "^_*[^_]*_*$|^[^a-z]*$",
+    { properties: false, classFields: false, onlyDeclarations: false, ignoreDestructuring: true },
+  ],
+  // Deno's `recommended` rules outside the categories.
+  "no-array-constructor": "error",
+  "no-case-declarations": "error",
+  "no-empty": "error",
+  "no-fallthrough": "error",
+  "no-inner-declarations": "error",
+  "no-prototype-builtins": "error",
+  "no-redeclare": "error",
+  "no-regex-spaces": "error",
+  "no-var": "error",
+  "prefer-const": "error",
+  "require-await": "error",
+  "require-yield": "error",
+  "typescript/adjacent-overload-signatures": "error",
+  "typescript/ban-ts-comment": "error",
+  "typescript/no-empty-interface": "error",
+  "typescript/no-empty-object-type": "error",
+  "typescript/no-explicit-any": "error",
+  "typescript/no-namespace": "error",
+  "typescript/no-non-null-asserted-optional-chain": "error",
+  "typescript/no-unsafe-function-type": "error",
+  "typescript/no-wrapper-object-types": "error",
+  "typescript/prefer-as-const": "error",
+  "typescript/prefer-namespace-keyword": "error",
+  "typescript/triple-slash-reference": "error",
+  // Deno's `no-window`, `no-process-global`, and `no-node-globals`: on Node,
+  // these come from an explicit `node:` import instead of the global scope.
+  "no-restricted-globals": [
+    "error",
+    "window",
+    "process",
+    "Buffer",
+    "global",
+    "setImmediate",
+    "clearImmediate",
+  ],
+  // The explicit-types template's extras.
+  "import/no-cycle": "error",
+  "typescript/consistent-type-imports": "error",
+  "typescript/no-import-type-side-effects": "error",
+  "typescript/no-non-null-assertion": "error",
+  // Deno's `ban-untagged-ignore` and `ban-unused-ignore`, made stricter: no
+  // disable comments at all.
+  "project/no-disable-comments": "error",
+  "project/no-non-ts-imports": "error",
+  "unicorn/no-abusive-eslint-disable": "error",
+  // Pedantic, but Node's and the web's own types (`Response`, `Stats`,
+  // `RequestInit`) are mutable, so no parameter of theirs can pass; the
+  // explicit-types template and the app repos turn it off too.
+  "typescript/prefer-readonly-parameter-types": "off",
+};
+
+/**
+ * The repo-local plugin, namespace `project`: its own rules, enabled as
+ * `project/<rule>`, and `configs.project`, the rule list above.
+ */
+const plugin = {
+  meta: { name: "project" },
+  rules: {
+    "no-disable-comments": noDisableCommentsRule,
+    "no-non-ts-imports": noNonTsImportsRule,
+  },
+  configs: { project: { rules } },
+};
+
+export default plugin;
@@ -4,6 +4,7 @@ set -euo pipefail
 path=$(mktemp -d "${RUNNER_TEMP}/bot-agents-source-XXXXXX")
 mkdir "${path}/src"
 cp -a "${ACTION_PATH}"/src/*.ts "${path}/src/"
-cp -a "${ACTION_PATH}/profiles.yml" "${ACTION_PATH}/prompt.md" "${path}/"
+# package.json makes Node load the TypeScript sources as ES modules.
+cp -a "${ACTION_PATH}/package.json" "${ACTION_PATH}/profiles.json" "${ACTION_PATH}/prompt.md" "${path}/"
 chmod -R go-w "${path}"
 printf 'path=%s\n' "${path}" >> "${GITHUB_OUTPUT}"
@@ -0,0 +1,119 @@
+// Runs Claude Code for one profile and returns its final result text.
+import { createInterface } from "node:readline";
+import type { Readable } from "node:stream";
+
+import { isClaudeAuthFailure } from "./auth.ts";
+import type { ClaudeFailureFields } from "./auth.ts";
+import { chunks } from "./command.ts";
+import { agentCommand } from "./isolation.ts";
+import { isObject } from "./json.ts";
+import type { JsonObject } from "./json.ts";
+import { AgentAuthError, agentEnvironment } from "./profiles.ts";
+import { PROCESS_ENV, WORKSPACE } from "./run-context.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+
+// Claude Code's stream-json `result` event, in its own field names.
+type ClaudeResult = ClaudeFailureFields &
+  Partial<Record<"is_error", boolean>> & {
+    subtype: string;
+  };
+
+// Echoes stderr as it arrives and resolves with all of it.
+async function copyError(stream: Readable): Promise<string> {
+  const decoder = new TextDecoder();
+  let error = "";
+  for await (const chunk of chunks(stream)) {
+    const text = decoder.decode(chunk, { stream: true });
+    error += text;
+    console.error(text);
+  }
+  return error + decoder.decode();
+}
+
+// Prints the visible text of each streamed message part.
+function printParts(event: JsonObject): void {
+  const content = isObject(event.message) ? event.message.content : undefined;
+  for (const part of Array.isArray(content) ? content : []) {
+    if (isObject(part)) {
+      const text = part.thinking ?? part.text ?? part.name;
+      if (typeof text === "string" && text !== "") {
+        console.log(text);
+      }
+    }
+  }
+}
+
+function toResult(event: JsonObject): ClaudeResult {
+  const { is_error: isError, result, subtype, api_error_status: apiErrorStatus } = event;
+  return {
+    ...(typeof isError === "boolean" && { is_error: isError }),
+    ...(typeof result === "string" && { result }),
+    subtype: String(subtype),
+    ...((typeof apiErrorStatus === "number" || apiErrorStatus === null) && {
+      api_error_status: apiErrorStatus,
+    }),
+  };
+}
+
+// Prints each streamed message part and returns the final `result` event.
+async function readEvents(stream: Readable): Promise<ClaudeResult | undefined> {
+  let result: ClaudeResult | undefined;
+  for await (const line of createInterface({ input: stream, crlfDelay: Infinity })) {
+    if (line !== "") {
+      const event: unknown = JSON.parse(line);
+      if (isObject(event)) {
+        printParts(event);
+        if (event.type === "result") {
+          result = toResult(event);
+        }
+      }
+    }
+  }
+  return result;
+}
+
+function checkResult(result: ClaudeResult | undefined, error: string): string {
+  if (result?.is_error === true) {
+    const failure = new Error(result.result ?? `claude ended with ${result.subtype}`);
+    if (isClaudeAuthFailure(result)) {
+      throw new AgentAuthError("claude sign-in failed", { cause: failure });
+    }
+    throw failure;
+  }
+  if (result?.result === undefined) {
+    throw new Error(error.trim() || `claude ended with ${result?.subtype ?? "no result"}`);
+  }
+  return result.result;
+}
+
+export async function runClaude(
+  profile: RuntimeProfile,
+  token: string,
+  prompt: string,
+): Promise<string> {
+  const args = [
+    "--print",
+    "--dangerously-skip-permissions",
+    "--model",
+    profile.model,
+    "--output-format",
+    "stream-json",
+    "--verbose",
+    prompt,
+  ];
+  const claude = agentCommand(profile, "claude", args, {
+    cwd: WORKSPACE,
+    env: { ...agentEnvironment(PROCESS_ENV, profile, token), IS_SANDBOX: "1" },
+    clearEnv: true,
+    stdout: "piped",
+    stderr: "piped",
+  }).spawn();
+  const errorText = copyError(claude.stderr);
+  const result = await readEvents(claude.stdout);
+  const [status, error] = await Promise.all([claude.status, errorText]);
+  const body = checkResult(result, error);
+  if (!status.success) {
+    throw new Error(error.trim() || `claude exited with ${status.code}`);
+  }
+  return body;
+}
@@ -0,0 +1,174 @@
+// Signs Codex in for one profile, runs it, and returns its result file path.
+import process from "node:process";
+import type { Readable } from "node:stream";
+import { text } from "node:stream/consumers";
+import { setTimeout as sleep } from "node:timers/promises";
+
+import { isCodexAuthFailure, retryInvalidToken } from "./auth.ts";
+import type { CodexAuthentication } from "./auth.ts";
+import { chunks, endWith, writeChunk } from "./command.ts";
+import type { CommandStatus } from "./command.ts";
+import { agentCommand } from "./isolation.ts";
+import { AgentAuthError, agentEnvironment, withProfile } from "./profiles.ts";
+import {
+  makeProfileFile,
+  postAuthorComment,
+  PROCESS_ENV,
+  runAgentCommand,
+  WORKSPACE,
+} from "./run-context.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+
+interface CodexAttempt {
+  status: CommandStatus;
+  error: string;
+}
+
+async function collectText(stream: Readable, append: (chunk: string) => void): Promise<void> {
+  const decoder = new TextDecoder();
+  for await (const chunk of chunks(stream)) {
+    append(decoder.decode(chunk, { stream: true }));
+  }
+  append(decoder.decode());
+}
+
+// Polls every 100 ms until the login prints something, failing if it exits first.
+async function pollForInstructions(
+  shownText: () => string,
+  status: Promise<CommandStatus>,
+): Promise<void> {
+  if (shownText().trim() !== "") {
+    return;
+  }
+  const exited = await Promise.race([status.then(() => true), sleep(100, false)]);
+  if (exited) {
+    throw new AgentAuthError("AI bot login produced no instructions");
+  }
+  await pollForInstructions(shownText, status);
+}
+
+async function codexDeviceLogin(
+  profile: RuntimeProfile,
+  environment: Record<string, string>,
+): Promise<void> {
+  const login = agentCommand(profile, "codex", ["login", "--device-auth"], {
+    cwd: WORKSPACE,
+    env: environment,
+    clearEnv: true,
+    stdout: "piped",
+    stderr: "piped",
+  }).spawn();
+  let shown = "";
+  const append = (chunk: string): void => {
+    shown += chunk;
+  };
+  const drained = Promise.all([
+    collectText(login.stdout, append),
+    collectText(login.stderr, append),
+  ]);
+  await sleep(3000);
+  await pollForInstructions(() => shown, login.status);
+  await postAuthorComment(withProfile(shown, profile));
+  const [result] = await Promise.all([login.status, drained]);
+  if (!result.success) {
+    throw new AgentAuthError(`codex login exited with ${result.code}`);
+  }
+}
+
+async function codexApiLogin(
+  profile: RuntimeProfile,
+  environment: Record<string, string>,
+  token: string,
+): Promise<void> {
+  const login = agentCommand(profile, "codex", ["login", "--with-api-key"], {
+    cwd: WORKSPACE,
+    env: environment,
+    clearEnv: true,
+    stdin: "piped",
+    stderr: "piped",
+  }).spawn();
+  await endWith(login.stdin, `${token}\n`);
+  const [status, error] = await Promise.all([login.status, text(login.stderr)]);
+  if (!status.success) {
+    throw new Error(error.trim() || `codex login exited with ${status.code}`);
+  }
+}
+
+async function signIn(
+  profile: RuntimeProfile,
+  environment: Record<string, string>,
+  authentication: CodexAuthentication,
+): Promise<void> {
+  if (authentication.kind === "api-key") {
+    await codexApiLogin(profile, environment, authentication.token);
+    return;
+  }
+  const loggedIn = await agentCommand(profile, "codex", ["login", "status"], {
+    cwd: WORKSPACE,
+    env: environment,
+    clearEnv: true,
+  }).output();
+  if (!loggedIn.success) {
+    await codexDeviceLogin(profile, environment);
+  }
+}
+
+async function execCodex(
+  profile: RuntimeProfile,
+  environment: Record<string, string>,
+  prompt: string,
+  outputPath: string,
+): Promise<CodexAttempt> {
+  const args = [
+    "exec",
+    "--model",
+    profile.model,
+    "--dangerously-bypass-approvals-and-sandbox",
+    "--output-last-message",
+    outputPath,
+    prompt,
+  ];
+  const codex = agentCommand(profile, "codex", args, {
+    cwd: WORKSPACE,
+    env: environment,
+    clearEnv: true,
+    stdout: "inherit",
+    stderr: "piped",
+  }).spawn();
+  const decoder = new TextDecoder();
+  let error = "";
+  for await (const chunk of chunks(codex.stderr)) {
+    await writeChunk(process.stderr, chunk);
+    error += decoder.decode(chunk, { stream: true });
+  }
+  error += decoder.decode();
+  // Codex echoes the prompt, whose comments may quote auth errors.
+  return { status: await codex.status, error: error.replaceAll(prompt, "") };
+}
+
+export async function runCodex(
+  profile: RuntimeProfile,
+  prompt: string,
+  authentication: CodexAuthentication,
+): Promise<string> {
+  const token = authentication.kind === "api-key" ? authentication.token : undefined;
+  const environment = agentEnvironment(PROCESS_ENV, profile, token);
+  await signIn(profile, environment, authentication);
+  const outputPath = await makeProfileFile(profile, "result.md");
+  const attempt = (): Promise<CodexAttempt> => execCodex(profile, environment, prompt, outputPath);
+  const result =
+    authentication.kind === "api-key"
+      ? await attempt()
+      : await retryInvalidToken(attempt, async () => {
+          await runAgentCommand(profile, "codex", ["logout"]);
+          await codexDeviceLogin(profile, environment);
+        });
+  if (!result.status.success) {
+    const failure = new Error(result.error.trim() || `codex exited with ${result.status.code}`);
+    if (isCodexAuthFailure(result.error)) {
+      throw new AgentAuthError("codex sign-in failed", { cause: failure });
+    }
+    throw failure;
+  }
+  return outputPath;
+}
@@ -0,0 +1,46 @@
+// Runs OpenCode for one profile and returns its final visible text.
+import process from "node:process";
+
+import { chunks, writeChunk } from "./command.ts";
+import { agentCommand } from "./isolation.ts";
+import {
+  collectOpenCodeOutput,
+  openCodeArgs,
+  openCodeError,
+  parseOpenCodeEvents,
+} from "./opencode.ts";
+import { agentEnvironment } from "./profiles.ts";
+import { PROCESS_ENV, WORKSPACE } from "./run-context.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+
+export async function runOpenCode(
+  profile: RuntimeProfile,
+  token: string,
+  prompt: string,
+): Promise<string> {
+  const child = agentCommand(profile, "opencode", openCodeArgs(profile.model, prompt), {
+    cwd: WORKSPACE,
+    env: agentEnvironment(PROCESS_ENV, profile, token),
+    clearEnv: true,
+    stdout: "piped",
+    stderr: "piped",
+  }).spawn();
+  const collected = collectOpenCodeOutput(
+    chunks(child.stdout),
+    chunks(child.stderr),
+    async (chunk) => {
+      await writeChunk(process.stdout, chunk);
+    },
+    async (chunk) => {
+      await writeChunk(process.stderr, chunk);
+    },
+  );
+  const [status, streams] = await Promise.all([child.status, collected]);
+  const error = streams.stderr.trim();
+  if (!status.success) {
+    throw (
+      openCodeError(streams.stdout) ?? new Error(error || `opencode exited with ${status.code}`)
+    );
+  }
+  return parseOpenCodeEvents(streams.stdout);
+}
@@ -0,0 +1,30 @@
+// Dispatches one attempt to the agent CLI its profile names.
+import { runClaude } from "./agent-claude.ts";
+import { runCodex } from "./agent-codex.ts";
+import { runOpenCode } from "./agent-opencode.ts";
+import { codexAuthentication } from "./auth.ts";
+import type { CodexAuthentication } from "./auth.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+
+export interface AgentAnswer {
+  body?: string;
+  resultPath?: string;
+}
+
+// Runs the selected agent; Codex leaves its answer in a file, the others return it.
+export async function runAgent(
+  profile: RuntimeProfile,
+  token: string | undefined,
+  prompt: string,
+  authentication: CodexAuthentication | null,
+): Promise<AgentAnswer> {
+  if (profile.type === "claude") {
+    return { body: await runClaude(profile, token ?? "", prompt) };
+  }
+  if (profile.type === "codex") {
+    return {
+      resultPath: await runCodex(profile, prompt, authentication ?? codexAuthentication(token)),
+    };
+  }
+  return { body: await runOpenCode(profile, token ?? "", prompt) };
+}
@@ -1,4 +1,6 @@
-import { assertEquals, assertRejects } from "jsr:@std/assert@1";
+import { expect, test } from "vite-plus/test";
+import { mkdir, readFile, rm, stat, symlink, writeFile } from "node:fs/promises";
+
 import {
  codexAuthentication,
  isClaudeAuthFailure,
@@ -7,8 +9,9 @@ import {
  retryInvalidToken,
  stageCodexAuth,
 } from "./auth.ts";
+import { currentGid, currentUid, IS_WINDOWS, makeTempDir } from "./testing.ts";

-Deno.test("retries once after an invalid refresh token", async () => {
+test("retries once after an invalid refresh token", async () => {
  let attempts = 0;
  let relogins = 0;
  const result = await retryInvalidToken(
@@ -23,17 +26,14 @@ Deno.test("retries once after an invalid refresh token", async () => {
    },
  );

-  assertEquals(
-    { attempts, relogins, error: result.error },
-    {
+  expect({ attempts, relogins, error: result.error }).toStrictEqual({
    attempts: 2,
    relogins: 1,
    error: "still failed",
-    },
-  );
+  });
 });

-Deno.test("does not retry an unrelated failure", async () => {
+test("does not retry an unrelated failure", async () => {
  let attempts = 0;
  let relogins = 0;
  await retryInvalidToken(
@@ -50,7 +50,7 @@ Deno.test("does not retry an unrelated failure", async () => {
    },
  );

-  assertEquals({ attempts, relogins }, { attempts: 1, relogins: 0 });
+  expect({ attempts, relogins }).toStrictEqual({ attempts: 1, relogins: 0 });
 });

 // Verbatim stderr lines from the revoked-login job on lead/memona-home#36.
@@ -61,27 +61,26 @@ const REVOKED_CODEX = [
  "ERROR: workspace routing discovery unauthorized (401)",
 ];

-Deno.test("recognizes each Codex sign-in failure line", () => {
+test("recognizes each Codex sign-in failure line", () => {
  for (const line of [
    ...REVOKED_CODEX,
    `2026-10-12T02:28:05Z ERROR codex_login::auth::manager: Failed to refresh token status=401 Unauthorized detail=TokenErrorDetail { error_code: Some("refresh_token_expired"), .. }`,
    `ERROR: Your access token could not be refreshed because your refresh token was already used. Please log out and sign in again. (refresh_token_reused)`,
    "ERROR: unexpected status 401 Unauthorized: Incorrect API key provided: sk-inval*d123., auth error: 401, auth error code: invalid_api_key",
  ]) {
-    assertEquals(isCodexAuthFailure(`exec\n${line}\n`), true, line);
+    expect(isCodexAuthFailure(`exec\n${line}\n`), line).toBe(true);
  }
 });

-Deno.test("ignores auth words outside Codex error lines", () => {
-  assertEquals(
+test("ignores auth words outside Codex error lines", () => {
+  expect(
    isCodexAuthFailure(
-      "exec\ncurl returned 401 Unauthorized\ntoken_revoked in fixture\n" + "ERROR: tests failed\n",
+      "exec\ncurl returned 401 Unauthorized\ntoken_revoked in fixture\nERROR: tests failed\n",
    ),
-    false,
-  );
+  ).toBe(false);
 });

-Deno.test("re-logs in after the job 9837 revoked-session stderr", async () => {
+test("re-logs in after the job 9837 revoked-session stderr", async () => {
  let relogins = 0;
  let attempts = 0;
  const result = await retryInvalidToken(
@@ -96,91 +95,84 @@ Deno.test("re-logs in after the job 9837 revoked-session stderr", async () => {
    },
  );

-  assertEquals(
-    { relogins, success: result.status.success },
-    {
+  expect({ relogins, success: result.status.success }).toStrictEqual({
    relogins: 1,
    success: true,
-    },
-  );
+  });
 });

-Deno.test("recognizes a rejected Claude OAuth token", () => {
-  assertEquals(
+test("recognizes a rejected Claude OAuth token", () => {
+  expect(
    isClaudeAuthFailure({
      api_error_status: 401,
      result: "Failed to authenticate. API Error: 401 OAuth access token is invalid.",
    }),
-    true,
-  );
-  assertEquals(
+  ).toBe(true);
+  expect(
    isClaudeAuthFailure({
      result: "OAuth token has expired. Please obtain a new token or refresh your existing token.",
    }),
-    true,
-  );
-  assertEquals(isClaudeAuthFailure({ api_error_status: 429, result: "API Error: 429" }), false);
+  ).toBe(true);
+  expect(isClaudeAuthFailure({ api_error_status: 429, result: "API Error: 429" })).toBe(false);
 });

-Deno.test("selects API-key login only for a configured Codex token", () => {
-  assertEquals(codexAuthentication("selected-key"), {
+test("selects API-key login only for a configured Codex token", () => {
+  expect(codexAuthentication("selected-key")).toStrictEqual({
    kind: "api-key",
    token: "selected-key",
  });
-  assertEquals(codexAuthentication(undefined), { kind: "persistent" });
+  expect(codexAuthentication()).toStrictEqual({ kind: "persistent" });
 });

-const AUTH = JSON.stringify({
-  auth_mode: "chatgpt",
-  tokens: {
+const AUTH_TOKENS = {
  access_token: "access",
  refresh_token: "refresh",
  id_token: "id",
  account_id: "account",
-  },
-});
+};
+const AUTH = JSON.stringify({ auth_mode: "chatgpt", tokens: AUTH_TOKENS });

-Deno.test("stages and persists only a regular private Codex login", async () => {
-  if (Deno.build.os === "windows") return;
-  const root = await Deno.makeTempDir();
+test.skipIf(IS_WINDOWS)("stages and persists only a regular private Codex login", async () => {
+  const root = await makeTempDir();
  try {
    const canonical = `${root}/persistent/auth.json`;
-    await Deno.mkdir(`${root}/persistent`);
-    await Deno.writeTextFile(canonical, AUTH, { mode: 0o600 });
+    await mkdir(`${root}/persistent`);
+    await writeFile(canonical, AUTH, { mode: 0o600 });
    const home = `${root}/profile`;
-    await Deno.mkdir(home);
+    await mkdir(home);

-    const staged = await stageCodexAuth(canonical, home, Deno.uid()!, Deno.gid()!);
-    assertEquals(await Deno.readTextFile(staged), AUTH);
-    assertEquals((await Deno.stat(staged)).mode! & 0o777, 0o600);
+    const staged = await stageCodexAuth(canonical, home, currentUid(), currentGid());
+    expect(await readFile(staged, "utf8")).toStrictEqual(AUTH);
+    expect((await stat(staged)).mode & 0o777).toBe(0o600);

    const refreshed = JSON.stringify({
-      ...JSON.parse(AUTH),
-      tokens: { ...JSON.parse(AUTH).tokens, access_token: "refreshed" },
+      auth_mode: "chatgpt",
+      tokens: { ...AUTH_TOKENS, access_token: "refreshed" },
    });
-    await Deno.writeTextFile(staged, refreshed);
+    await writeFile(staged, refreshed);
    await persistCodexAuth(staged, canonical);
-    assertEquals(await Deno.readTextFile(canonical), refreshed);
-    assertEquals((await Deno.stat(canonical)).mode! & 0o777, 0o600);
+    expect(await readFile(canonical, "utf8")).toStrictEqual(refreshed);
+    expect((await stat(canonical)).mode & 0o777).toBe(0o600);
  } finally {
-    await Deno.remove(root, { recursive: true });
+    await rm(root, { recursive: true });
  }
 });

-Deno.test("rejects a symlink or malformed Codex login", async () => {
-  if (Deno.build.os === "windows") return;
-  const root = await Deno.makeTempDir();
+test.skipIf(IS_WINDOWS)("rejects a symlink or malformed Codex login", async () => {
+  const root = await makeTempDir();
  try {
    const canonical = `${root}/auth.json`;
    const malformed = `${root}/malformed.json`;
    const linked = `${root}/linked.json`;
-    await Deno.writeTextFile(canonical, AUTH, { mode: 0o600 });
-    await Deno.writeTextFile(malformed, '{"tokens":{}}', { mode: 0o600 });
-    await Deno.symlink(canonical, linked);
+    await writeFile(canonical, AUTH, { mode: 0o600 });
+    await writeFile(malformed, '{"tokens":{}}', { mode: 0o600 });
+    await symlink(canonical, linked);

-    await assertRejects(() => persistCodexAuth(linked, canonical), Error, "regular file");
-    await assertRejects(() => persistCodexAuth(malformed, canonical), Error, "invalid Codex login");
+    await expect(() => persistCodexAuth(linked, canonical)).rejects.toThrow("regular file");
+    await expect(() => persistCodexAuth(malformed, canonical)).rejects.toThrow(
+      "invalid Codex login",
+    );
  } finally {
-    await Deno.remove(root, { recursive: true });
+    await rm(root, { recursive: true });
  }
 });
@@ -1,4 +1,19 @@
-import { dirname, join } from "jsr:@std/path@1";
+import { randomUUID } from "node:crypto";
+import {
+  chmod,
+  chown,
+  lstat,
+  mkdir,
+  open,
+  readFile,
+  rename,
+  rm,
+  writeFile,
+} from "node:fs/promises";
+import { dirname, join } from "node:path";
+
+import { isNotFound } from "./errors.ts";
+import { isObject } from "./json.ts";

 export type CodexAuthentication = { kind: "api-key"; token: string } | { kind: "persistent" };

@@ -9,7 +24,7 @@ export function codexAuthentication(token?: string): CodexAuthentication {
 // Codex logs revoked, expired, or reused ChatGPT sign-ins and rejected API keys
 // on its own ERROR lines; tool output and the echoed prompt must not count.
 const CODEX_AUTH_FAILURE =
-  /^(?:\S+\s+)?ERROR\b.*(?:\b401\b|unauthorized|invalid_refresh_token|refresh_token_(?:expired|reused|invalidated)|token_(?:revoked|expired)|invalid_api_key|(?:log|sign) in again)/im;
+  /^(?:\S+\s+)?ERROR\b.*(?:\b401\b|unauthorized|invalid_refresh_token|refresh_token_(?:expired|reused|invalidated)|token_(?:revoked|expired)|invalid_api_key|(?:log|sign) in again)/imu;

 export function isCodexAuthFailure(error: string): boolean {
  return CODEX_AUTH_FAILURE.test(error);
@@ -18,13 +33,16 @@ export function isCodexAuthFailure(error: string): boolean {
 // Claude Code reports a rejected CLAUDE_CODE_OAUTH_TOKEN as an is_error
 // stream-json result, e.g. "Failed to authenticate. API Error: 401 OAuth
 // access token is invalid." with api_error_status 401.
-export function isClaudeAuthFailure(result: {
-  api_error_status?: number | null;
+// The fields of Claude Code's stream-json `result` event that tell a sign-in
+// failure apart, under their own names.
+export type ClaudeFailureFields = Partial<Record<"api_error_status", number | null>> & {
  result?: string;
-}): boolean {
+};
+
+export function isClaudeAuthFailure(result: ClaudeFailureFields): boolean {
  return (
    result.api_error_status === 401 ||
-    /failed to authenticate|oauth (?:access )?token (?:is invalid|has expired)|invalid api key|authentication_error|please run \/login|not logged in/i.test(
+    /failed to authenticate|oauth (?:access )?token (?:is invalid|has expired)|invalid api key|authentication_error|please run \/login|not logged in/iu.test(
      result.result ?? "",
    )
  );
@@ -42,33 +60,35 @@ export async function retryInvalidToken<T extends { status: { success: boolean }
  return result;
 }

+function hasCodexTokens(tokens: unknown): boolean {
+  return (
+    isObject(tokens) &&
+    ["access_token", "refresh_token", "id_token", "account_id"].every(
+      (name) => typeof tokens[name] === "string" && tokens[name] !== "",
+    )
+  );
+}
+
 async function readCodexAuth(path: string): Promise<string> {
-  const stat = await Deno.lstat(path);
-  if (!stat.isFile || stat.isSymlink) {
+  const stat = await lstat(path);
+  if (!stat.isFile() || stat.isSymbolicLink()) {
    throw new Error("Codex login must be a regular file");
  }
-  if ((stat.mode! & 0o077) !== 0) {
+  if ((stat.mode & 0o077) !== 0) {
    throw new Error("Codex login must be private");
  }
-  const text = await Deno.readTextFile(path);
+  const text = await readFile(path, "utf8");
  let value: unknown;
  try {
    value = JSON.parse(text);
  } catch {
    throw new Error("invalid Codex login");
  }
-  const record = value as Record<string, unknown> | null;
-  const tokens = record?.tokens as Record<string, unknown> | null;
  if (
-    record === null ||
-    typeof record !== "object" ||
-    typeof record.auth_mode !== "string" ||
-    record.auth_mode === "" ||
-    tokens === null ||
-    typeof tokens !== "object" ||
-    !["access_token", "refresh_token", "id_token", "account_id"].every(
-      (name) => typeof tokens[name] === "string" && tokens[name] !== "",
-    )
+    !isObject(value) ||
+    typeof value.auth_mode !== "string" ||
+    value.auth_mode === "" ||
+    !hasCodexTokens(value.tokens)
  ) {
    throw new Error("invalid Codex login");
  }
@@ -82,33 +102,39 @@ export async function stageCodexAuth(
  gid: number,
 ): Promise<string> {
  const codexHome = join(profileHome, ".codex");
-  await Deno.mkdir(codexHome, { recursive: true, mode: 0o700 });
-  await Deno.chmod(codexHome, 0o700);
-  await Deno.chown(codexHome, uid, gid);
+  await mkdir(codexHome, { recursive: true, mode: 0o700 });
+  await chmod(codexHome, 0o700);
+  await chown(codexHome, uid, gid);
  const stagedPath = join(codexHome, "auth.json");
  try {
-    await Deno.writeTextFile(stagedPath, await readCodexAuth(canonicalPath), {
-      mode: 0o600,
-    });
-    await Deno.chmod(stagedPath, 0o600);
-    await Deno.chown(stagedPath, uid, gid);
+    await writeFile(stagedPath, await readCodexAuth(canonicalPath), { mode: 0o600 });
+    await chmod(stagedPath, 0o600);
+    await chown(stagedPath, uid, gid);
  } catch (error) {
-    if (!(error instanceof Deno.errors.NotFound)) throw error;
+    if (!isNotFound(error)) throw error;
  }
  return stagedPath;
 }

+// Creates an empty private file under a fresh name, as Deno.makeTempFile did.
+async function makeTempFile(directory: string): Promise<string> {
+  const path = join(directory, `.tmp-${randomUUID()}`);
+  const handle = await open(path, "wx", 0o600);
+  await handle.close();
+  return path;
+}
+
 export async function persistCodexAuth(stagedPath: string, canonicalPath: string): Promise<void> {
  const text = await readCodexAuth(stagedPath);
  const directory = dirname(canonicalPath);
-  await Deno.mkdir(directory, { recursive: true, mode: 0o700 });
-  const temporary = await Deno.makeTempFile({ dir: directory });
+  await mkdir(directory, { recursive: true, mode: 0o700 });
+  const temporary = await makeTempFile(directory);
  try {
-    await Deno.writeTextFile(temporary, text, { mode: 0o600 });
-    await Deno.chmod(temporary, 0o600);
-    await Deno.rename(temporary, canonicalPath);
+    await writeFile(temporary, text, { mode: 0o600 });
+    await chmod(temporary, 0o600);
+    await rename(temporary, canonicalPath);
  } catch (error) {
-    await Deno.remove(temporary).catch(() => undefined);
+    await rm(temporary).catch(() => {});
    throw error;
  }
 }
@@ -0,0 +1,160 @@
+// A child process with the call shapes the runner was reviewed with: `output()`
+// collects both streams, `spawn()` hands them out, and `clearEnv` passes only
+// the given environment. Streams default as Deno's did: stdin is inherited,
+// stdout and stderr are piped for `output()` and inherited for `spawn()`.
+import { spawn as spawnProcess } from "node:child_process";
+import type { ChildProcess, StdioOptions } from "node:child_process";
+import { Buffer } from "node:buffer";
+import { constants } from "node:os";
+import process from "node:process";
+import type { Readable, Writable } from "node:stream";
+import { buffer } from "node:stream/consumers";
+import { finished } from "node:stream/promises";
+
+export type StdioMode = "inherit" | "piped" | "null";
+
+export interface CommandOptions {
+  args?: string[];
+  cwd?: string;
+  env?: Record<string, string>;
+  clearEnv?: boolean;
+  uid?: number;
+  gid?: number;
+  stdin?: StdioMode;
+  stdout?: StdioMode;
+  stderr?: StdioMode;
+}
+
+export interface CommandStatus {
+  success: boolean;
+  code: number;
+}
+
+export interface CommandOutput extends CommandStatus {
+  stdout: Uint8Array;
+  stderr: Uint8Array;
+}
+
+export interface CommandChild {
+  status: Promise<CommandStatus>;
+  stdin: Writable;
+  stdout: Readable;
+  stderr: Readable;
+}
+
+const STDIO: Record<StdioMode, "inherit" | "pipe" | "ignore"> = {
+  inherit: "inherit",
+  piped: "pipe",
+  null: "ignore",
+};
+
+function signalNumber(signal: NodeJS.Signals): number {
+  return constants.signals[signal];
+}
+
+function startProcess(
+  command: string,
+  options: CommandOptions,
+  outputDefault: StdioMode,
+): ChildProcess {
+  const stdio: StdioOptions = [
+    STDIO[options.stdin ?? "inherit"],
+    STDIO[options.stdout ?? outputDefault],
+    STDIO[options.stderr ?? outputDefault],
+  ];
+  const environment = options.clearEnv === true ? options.env : { ...process.env, ...options.env };
+  return spawnProcess(command, options.args ?? [], {
+    stdio,
+    ...(options.cwd !== undefined && { cwd: options.cwd }),
+    ...(environment !== undefined && { env: environment }),
+    ...(options.uid !== undefined && { uid: options.uid }),
+    ...(options.gid !== undefined && { gid: options.gid }),
+  });
+}
+
+// Settles when the process exits, before its streams close, as Deno's did. A
+// signal-killed process reports 128 plus the signal number, as a shell does.
+function waitForStatus(child: ChildProcess): Promise<CommandStatus> {
+  return new Promise((resolve, reject) => {
+    child.once("error", reject);
+    child.once("exit", (code, signal) => {
+      const exitCode = code ?? (signal === null ? 1 : 128 + signalNumber(signal));
+      resolve({ success: exitCode === 0, code: exitCode });
+    });
+  });
+}
+
+function piped<T>(stream: T | null, name: string): T {
+  if (stream === null) {
+    throw new TypeError(`${name} is not piped`);
+  }
+  return stream;
+}
+
+function collect(stream: Readable | null): Promise<Uint8Array> {
+  return stream === null ? Promise.resolve(new Uint8Array()) : buffer(stream);
+}
+
+// A stream's chunks as bytes, whether or not it has an encoding set.
+export async function* chunks(stream: Readable): AsyncGenerator<Uint8Array> {
+  for await (const chunk of stream) {
+    const value: unknown = chunk;
+    if (value instanceof Uint8Array) {
+      yield value;
+    } else if (typeof value === "string") {
+      yield Buffer.from(value);
+    }
+  }
+}
+
+export function spawn(command: string, options: CommandOptions = {}): CommandChild {
+  const child = startProcess(command, options, "inherit");
+  const status = waitForStatus(child);
+  // A failed start rejects `status`; the caller sees it once it awaits that.
+  status.catch(() => {});
+  return {
+    status,
+    get stdin(): Writable {
+      return piped(child.stdin, "stdin");
+    },
+    get stdout(): Readable {
+      return piped(child.stdout, "stdout");
+    },
+    get stderr(): Readable {
+      return piped(child.stderr, "stderr");
+    },
+  };
+}
+
+export async function output(
+  command: string,
+  options: CommandOptions = {},
+): Promise<CommandOutput> {
+  const child = startProcess(command, options, "piped");
+  const [status, stdout, stderr] = await Promise.all([
+    waitForStatus(child),
+    collect(child.stdout),
+    collect(child.stderr),
+  ]);
+  return { ...status, stdout, stderr };
+}
+
+// Writes one chunk and settles once the stream has taken it, as Deno's
+// `Deno.stdout.write` did.
+export async function writeChunk(stream: Writable, chunk: Uint8Array): Promise<void> {
+  await new Promise<void>((resolve, reject) => {
+    stream.write(chunk, (error) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve();
+      }
+    });
+  });
+}
+
+// Writes the last chunk and settles once the stream has flushed and closed.
+export async function endWith(stream: Writable, chunk: string): Promise<void> {
+  stream.end(chunk);
+  await finished(stream);
+}
@@ -0,0 +1,68 @@
+import { expect, test } from "vite-plus/test";
+import { decryptCredential, encryptCredential, parseCredentials } from "./credentials.ts";
+
+const MASTER_KEY = "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8";
+const OTHER_KEY = "AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE";
+const NONCE = Uint8Array.from({ length: 12 }, (_, index) => index + 32);
+const ENCRYPTED = "v1:ICEiIyQlJicoKSor:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA";
+
+test("decrypts a known AES-256-GCM credential", async () => {
+  expect(await decryptCredential(ENCRYPTED, MASTER_KEY)).toBe("secret-token");
+});
+
+test("encrypts a credential with a fresh supplied nonce", async () => {
+  expect(await encryptCredential("secret-token", MASTER_KEY, NONCE)).toStrictEqual(ENCRYPTED);
+});
+
+test("rejects a credential encrypted by another master key", async () => {
+  await expect(() => decryptCredential(ENCRYPTED, OTHER_KEY)).rejects.toThrow();
+});
+
+test("rejects a credential with a nonstandard nonce", async () => {
+  await expect(() =>
+    decryptCredential("v1:AA:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA", MASTER_KEY),
+  ).rejects.toThrow("nonce must be 12 bytes");
+});
+
+test("decrypts the central reviewer token and ordered profiles", async () => {
+  expect(
+    await parseCredentials(
+      JSON.stringify({
+        "reviewer-token": ENCRYPTED,
+        profiles: [
+          { type: "codex", model: "gpt-custom" },
+          { type: "claude", token: ENCRYPTED },
+          { type: "opencode", token: ENCRYPTED },
+        ],
+      }),
+      MASTER_KEY,
+    ),
+  ).toStrictEqual({
+    reviewerToken: "secret-token",
+    profiles: [
+      { type: "codex", model: "gpt-custom" },
+      {
+        type: "claude",
+        model: "claude-sonnet-5",
+        token: "secret-token",
+      },
+      {
+        type: "opencode",
+        model: "openrouter/qwen/qwen3.8-27b",
+        token: "secret-token",
+      },
+    ],
+  });
+});
+
+test("rejects malformed central credentials", async () => {
+  await expect(() => parseCredentials('{"profiles": []}', MASTER_KEY)).rejects.toThrow(
+    "reviewer-token",
+  );
+  await expect(() =>
+    parseCredentials(
+      JSON.stringify({ "reviewer-token": ENCRYPTED, profiles: [{ type: "claude" }] }),
+      MASTER_KEY,
+    ),
+  ).rejects.toThrow("profiles[0].token");
+});
@@ -1,4 +1,6 @@
-import { parse } from "jsr:@std/yaml@1";
+import { webcrypto } from "node:crypto";
+
+import { isMapping } from "./json.ts";
 import type { BotProfile } from "./profiles.ts";

 const DEFAULT_MODELS: Record<BotProfile["type"], string> = {
@@ -7,40 +9,40 @@ const DEFAULT_MODELS: Record<BotProfile["type"], string> = {
  opencode: "openrouter/qwen/qwen3.8-27b",
 };

-export type BotCredentials = {
+export interface BotCredentials {
  reviewerToken: string;
  profiles: BotProfile[];
-};
+}

 function decodeBase64Url(value: string): Uint8Array {
  const base64 = value.replaceAll("-", "+").replaceAll("_", "/");
  const padded = base64.padEnd(Math.ceil(base64.length / 4) * 4, "=");
-  return Uint8Array.from(atob(padded), (character) => character.charCodeAt(0));
+  return Uint8Array.from(atob(padded), (character) => character.codePointAt(0) ?? 0);
 }

 function encodeBase64Url(value: Uint8Array): string {
-  const binary = Array.from(value, (byte) => String.fromCharCode(byte)).join("");
+  const binary = Array.from(value, (byte) => String.fromCodePoint(byte)).join("");
  return btoa(binary).replaceAll("+", "-").replaceAll("/", "_").replaceAll("=", "");
 }

 const buffer = (value: Uint8Array): ArrayBuffer => Uint8Array.from(value).buffer;

-async function importMasterKey(encoded: string, usage: KeyUsage): Promise<CryptoKey> {
+function importMasterKey(encoded: string, usage: webcrypto.KeyUsage): Promise<webcrypto.CryptoKey> {
  const bytes = decodeBase64Url(encoded);
  if (bytes.length !== 32) {
    throw new Error("master-key must be 32 bytes encoded as base64url");
  }
-  return await crypto.subtle.importKey("raw", buffer(bytes), "AES-GCM", false, [usage]);
+  return webcrypto.subtle.importKey("raw", buffer(bytes), "AES-GCM", false, [usage]);
 }

 export async function decryptCredential(encrypted: string, masterKey: string): Promise<string> {
-  const [version, encodedNonce, encodedCiphertext, extra] = encrypted.split(":");
-  if (version !== "v1" || !encodedNonce || !encodedCiphertext || extra) {
+  const [version, encodedNonce = "", encodedCiphertext = "", extra = ""] = encrypted.split(":");
+  if (version !== "v1" || encodedNonce === "" || encodedCiphertext === "" || extra !== "") {
    throw new Error("credential must use v1:<nonce>:<ciphertext>");
  }
  const nonce = decodeBase64Url(encodedNonce);
  if (nonce.length !== 12) throw new Error("credential nonce must be 12 bytes");
-  const plaintext = await crypto.subtle.decrypt(
+  const plaintext = await webcrypto.subtle.decrypt(
    { name: "AES-GCM", iv: buffer(nonce) },
    await importMasterKey(masterKey, "decrypt"),
    buffer(decodeBase64Url(encodedCiphertext)),
@@ -51,10 +53,10 @@ export async function decryptCredential(encrypted: string, masterKey: string): P
 export async function encryptCredential(
  plaintext: string,
  masterKey: string,
-  nonce: Uint8Array = crypto.getRandomValues(new Uint8Array(12)),
+  nonce: Uint8Array = webcrypto.getRandomValues(new Uint8Array(12)),
 ): Promise<string> {
  if (nonce.length !== 12) throw new Error("AES-GCM nonce must be 12 bytes");
-  const ciphertext = await crypto.subtle.encrypt(
+  const ciphertext = await webcrypto.subtle.encrypt(
    { name: "AES-GCM", iv: buffer(nonce) },
    await importMasterKey(masterKey, "encrypt"),
    new TextEncoder().encode(plaintext),
@@ -62,38 +64,19 @@ export async function encryptCredential(
  return `v1:${encodeBase64Url(nonce)}:${encodeBase64Url(new Uint8Array(ciphertext))}`;
 }

-export async function parseCredentials(text: string, masterKey: string): Promise<BotCredentials> {
-  const value: unknown = parse(text);
-  if (typeof value !== "object" || value === null || Array.isArray(value)) {
-    throw new Error("credentials must be a mapping");
-  }
-  const record = value as Record<string, unknown>;
-  for (const key of Object.keys(record)) {
-    if (key !== "reviewer-token" && key !== "profiles") {
-      throw new Error(`${key}: unknown field`);
-    }
-  }
-  if (typeof record["reviewer-token"] !== "string") {
-    throw new Error("reviewer-token: expected an encrypted credential");
-  }
-  if (!Array.isArray(record.profiles) || record.profiles.length === 0) {
-    throw new Error("profiles must contain at least one profile");
-  }
-  const profiles = await Promise.all(
-    record.profiles.map(async (entry: unknown, index): Promise<BotProfile> => {
+async function parseProfile(entry: unknown, index: number, masterKey: string): Promise<BotProfile> {
  const at = `profiles[${index}]`;
-      if (typeof entry !== "object" || entry === null || Array.isArray(entry)) {
-        throw new Error(`${at}: expected a mapping`);
+  if (!isMapping(entry)) {
+    throw new TypeError(`${at}: expected a mapping`);
  }
-      const profile = entry as Record<string, unknown>;
-      for (const key of Object.keys(profile)) {
+  for (const key of Object.keys(entry)) {
    if (key !== "type" && key !== "model" && key !== "token") {
      throw new Error(`${at}.${key}: unknown field`);
    }
  }
-      const { type, model, token } = profile;
+  const { type, model, token } = entry;
  if (type !== "claude" && type !== "codex" && type !== "opencode") {
-        throw new Error(`${at}.type: expected \"claude\", \"codex\", or \"opencode\"`);
+    throw new Error(`${at}.type: expected "claude", "codex", or "opencode"`);
  }
  if (model !== undefined && (typeof model !== "string" || model === "")) {
    throw new Error(`${at}.model: expected a model name`);
@@ -111,10 +94,27 @@ export async function parseCredentials(text: string, masterKey: string): Promise
      token: await decryptCredential(token, masterKey),
    }),
  };
-    }),
-  );
-  return {
-    reviewerToken: await decryptCredential(record["reviewer-token"], masterKey),
-    profiles,
-  };
+}
+
+export async function parseCredentials(text: string, masterKey: string): Promise<BotCredentials> {
+  const value: unknown = JSON.parse(text);
+  if (!isMapping(value)) {
+    throw new TypeError("credentials must be a mapping");
+  }
+  for (const key of Object.keys(value)) {
+    if (key !== "reviewer-token" && key !== "profiles") {
+      throw new Error(`${key}: unknown field`);
+    }
+  }
+  const { "reviewer-token": reviewerToken, profiles } = value;
+  if (typeof reviewerToken !== "string") {
+    throw new TypeError("reviewer-token: expected an encrypted credential");
+  }
+  if (!Array.isArray(profiles) || profiles.length === 0) {
+    throw new Error("profiles must contain at least one profile");
+  }
+  const parsed = await Promise.all(
+    profiles.map((entry: unknown, index) => parseProfile(entry, index, masterKey)),
+  );
+  return { reviewerToken: await decryptCredential(reviewerToken, masterKey), profiles: parsed };
 }
@@ -1,70 +0,0 @@
-import { assertEquals, assertRejects } from "jsr:@std/assert@1";
-import { decryptCredential, encryptCredential, parseCredentials } from "./credentials.ts";
-
-const MASTER_KEY = "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8";
-const OTHER_KEY = "AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE";
-const NONCE = Uint8Array.from({ length: 12 }, (_, index) => index + 32);
-const ENCRYPTED = "v1:ICEiIyQlJicoKSor:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA";
-
-Deno.test("decrypts a known AES-256-GCM credential", async () => {
-  assertEquals(await decryptCredential(ENCRYPTED, MASTER_KEY), "secret-token");
-});
-
-Deno.test("encrypts a credential with a fresh supplied nonce", async () => {
-  assertEquals(await encryptCredential("secret-token", MASTER_KEY, NONCE), ENCRYPTED);
-});
-
-Deno.test("rejects a credential encrypted by another master key", async () => {
-  await assertRejects(() => decryptCredential(ENCRYPTED, OTHER_KEY));
-});
-
-Deno.test("rejects a credential with a nonstandard nonce", async () => {
-  await assertRejects(
-    () => decryptCredential("v1:AA:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA", MASTER_KEY),
-    Error,
-    "nonce must be 12 bytes",
-  );
-});
-
-Deno.test("decrypts the central reviewer token and ordered profiles", async () => {
-  assertEquals(
-    await parseCredentials(
-      `
-reviewer-token: ${ENCRYPTED}
-profiles:
-  - type: codex
-    model: gpt-custom
-  - type: claude
-    token: ${ENCRYPTED}
-  - type: opencode
-    token: ${ENCRYPTED}
-`,
-      MASTER_KEY,
-    ),
-    {
-      reviewerToken: "secret-token",
-      profiles: [
-        { type: "codex", model: "gpt-custom" },
-        {
-          type: "claude",
-          model: "claude-sonnet-5",
-          token: "secret-token",
-        },
-        {
-          type: "opencode",
-          model: "openrouter/qwen/qwen3.8-27b",
-          token: "secret-token",
-        },
-      ],
-    },
-  );
-});
-
-Deno.test("rejects malformed central credentials", async () => {
-  await assertRejects(() => parseCredentials("profiles: []", MASTER_KEY), Error, "reviewer-token");
-  await assertRejects(
-    () => parseCredentials(`reviewer-token: ${ENCRYPTED}\nprofiles:\n  - type: claude`, MASTER_KEY),
-    Error,
-    "profiles[0].token",
-  );
-});
@@ -0,0 +1,8 @@
+// Node reports a missing file as ENOENT and a missing process as ESRCH, where
+// Deno threw `Deno.errors.NotFound` for both.
+export function isNotFound(error: unknown): boolean {
+  if (!(error instanceof Error) || !("code" in error)) {
+    return false;
+  }
+  return error.code === "ENOENT" || error.code === "ESRCH";
+}
@@ -0,0 +1,112 @@
+import { expect, test } from "vite-plus/test";
+import { chmod, chown, mkdir, readFile, rm, symlink, writeFile } from "node:fs/promises";
+import process from "node:process";
+
+import { isNotFound } from "./errors.ts";
+import {
+  agentCommand,
+  isRunnableProfileProcess,
+  killProfileProcesses,
+  readProfileFile,
+} from "./isolation.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+import { currentUid, IS_ROOT, IS_WINDOWS, makeTempDir } from "./testing.ts";
+
+const profile = (uid: number, home: string): RuntimeProfile => ({
+  index: uid - 20_000,
+  type: "claude",
+  model: "test",
+  uid,
+  gid: uid,
+  home,
+  tokenFile: null,
+});
+
+test("zombie process entries are already quiescent", () => {
+  const status = "State:\tZ (zombie)\nUid:\t20010\t20010\t20010\t20010\n";
+  expect(isRunnableProfileProcess(status, 20_010)).toBe(false);
+});
+
+test.skipIf(IS_WINDOWS)("refuses to read a profile result symlink as root", async () => {
+  const root = await makeTempDir();
+  try {
+    const secret = `${root}/reviewer-token`;
+    const result = `${root}/result.md`;
+    await writeFile(secret, "reviewer-secret", { mode: 0o600 });
+    await symlink(secret, result);
+
+    await expect(() => readProfileFile(profile(currentUid(), root), result)).rejects.toThrow(
+      "regular private file",
+    );
+  } finally {
+    await rm(root, { recursive: true });
+  }
+});
+
+test.skipIf(!IS_ROOT)("a profile process can read only its own private files", async () => {
+  const root = await makeTempDir();
+  await chmod(root, 0o711);
+  try {
+    const homeA = `${root}/a`;
+    const homeB = `${root}/b`;
+    await mkdir(homeA, { mode: 0o700 });
+    await mkdir(homeB, { mode: 0o700 });
+    await chown(homeA, 20_000, 20_000);
+    await chown(homeB, 20_001, 20_001);
+    await writeFile(`${homeA}/token`, "own", { mode: 0o600 });
+    await chown(`${homeA}/token`, 20_000, 20_000);
+    await writeFile(`${homeB}/token`, "sibling", { mode: 0o600 });
+    await chown(`${homeB}/token`, 20_001, 20_001);
+    await writeFile(`${root}/reviewer`, "root", { mode: 0o600 });
+
+    const selected = profile(20_000, homeA);
+    const own = await agentCommand(selected, "/bin/cat", [`${homeA}/token`], {
+      cwd: "/",
+    }).output();
+    const sibling = await agentCommand(selected, "/bin/cat", [`${homeB}/token`], {
+      cwd: "/",
+    }).output();
+    const reviewer = await agentCommand(selected, "/bin/cat", [`${root}/reviewer`], {
+      cwd: "/",
+    }).output();
+
+    expect(new TextDecoder().decode(own.stdout)).toBe("own");
+    expect(own.success).toBe(true);
+    expect(sibling.success).toBe(false);
+    expect(reviewer.success).toBe(false);
+  } finally {
+    await rm(root, { recursive: true });
+  }
+});
+
+test.skipIf(!IS_ROOT)("cleanup leaves no runnable daemonized process", async () => {
+  const selected = profile(20_010, "/tmp");
+  const launched = await agentCommand(
+    selected,
+    "/bin/sh",
+    ["-c", "sleep 60 >/dev/null 2>&1 & echo $!"],
+    { cwd: "/" },
+  ).output();
+  const pid = Number(new TextDecoder().decode(launched.stdout).trim());
+  expect(Number.isInteger(pid)).toBe(true);
+
+  await killProfileProcesses(selected.uid);
+
+  const status = await readFile(`/proc/${pid}/status`, "utf8").catch((error: unknown) => {
+    if (isNotFound(error)) return null;
+    throw error;
+  });
+  expect(status === null || !isRunnableProfileProcess(status, selected.uid)).toBe(true);
+});
+
+test.skipIf(!IS_ROOT)("the agent process cannot read its coordinator environment", async () => {
+  const selected = profile(20_020, "/tmp");
+  const result = await agentCommand(selected, "/usr/bin/cat", [`/proc/${process.pid}/environ`], {
+    cwd: "/",
+    env: { PARENT_SECRET: "must-not-cross-boundary" },
+    clearEnv: true,
+    stderr: "piped",
+  }).output();
+
+  expect(result.success).toBe(false);
+});
@@ -1,57 +1,89 @@
+import { lstat, readdir, readFile } from "node:fs/promises";
+import process from "node:process";
+import { setTimeout as sleep } from "node:timers/promises";
+
+import { output, spawn } from "./command.ts";
+import type { CommandChild, CommandOptions, CommandOutput } from "./command.ts";
+import { isNotFound } from "./errors.ts";
 import type { RuntimeProfile } from "./runtime.ts";

+export type AgentCommandOptions = Omit<CommandOptions, "args" | "uid" | "gid">;
+
+export interface AgentCommand {
+  output(): Promise<CommandOutput>;
+  spawn(): CommandChild;
+}
+
 export function agentCommand(
  profile: RuntimeProfile,
  command: string,
  args: string[],
-  options: Omit<Deno.CommandOptions, "args" | "uid" | "gid"> = {},
-): Deno.Command {
-  return new Deno.Command(command, {
-    ...options,
-    args,
-    uid: profile.uid,
-    gid: profile.gid,
-  });
+  options: AgentCommandOptions = {},
+): AgentCommand {
+  const full: CommandOptions = { ...options, args, uid: profile.uid, gid: profile.gid };
+  return {
+    output: () => output(command, full),
+    spawn: () => spawn(command, full),
+  };
 }

 export function isRunnableProfileProcess(status: string, uid: number): boolean {
-  const owner = status.match(/^Uid:\s+(\d+)/m)?.[1];
-  const state = status.match(/^State:\s+(\w)/m)?.[1];
+  const owner = /^Uid:\s+(\d+)/mu.exec(status)?.[1];
+  const state = /^State:\s+(\w)/mu.exec(status)?.[1];
  return owner !== undefined && Number(owner) === uid && state !== "Z";
 }

 async function profileProcessIds(uid: number): Promise<number[]> {
-  const ids: number[] = [];
-  for await (const entry of Deno.readDir("/proc")) {
-    if (!entry.isDirectory || !/^\d+$/.test(entry.name)) continue;
-    const status = await Deno.readTextFile(`/proc/${entry.name}/status`).catch(() => null);
-    if (status !== null && isRunnableProfileProcess(status, uid)) {
-      ids.push(Number(entry.name));
-    }
-  }
-  return ids;
+  const entries = await readdir("/proc", { withFileTypes: true });
+  const pids = entries
+    .filter((entry) => entry.isDirectory() && /^\d+$/u.test(entry.name))
+    .map((entry) => entry.name);
+  const statuses = await Promise.all(
+    pids.map((pid) => readFile(`/proc/${pid}/status`, "utf8").catch(() => null)),
+  );
+  return pids
+    .filter((_pid, index) => {
+      const status = statuses[index];
+      return status !== null && status !== undefined && isRunnableProfileProcess(status, uid);
+    })
+    .map(Number);
 }

-export async function killProfileProcesses(uid: number): Promise<void> {
-  for (let attempt = 0; attempt < 100; attempt++) {
-    const ids = await profileProcessIds(uid);
-    if (ids.length === 0) return;
-    for (const pid of ids) {
+function killProcess(pid: number): void {
  try {
-        Deno.kill(pid, "SIGKILL");
+    process.kill(pid, "SIGKILL");
  } catch (error) {
-        if (!(error instanceof Deno.errors.NotFound)) throw error;
+    if (!isNotFound(error)) {
+      throw error;
    }
  }
-    await new Promise((resolve) => setTimeout(resolve, 10));
-  }
+}
+
+// Kills the UID's processes every 10 ms until none is left, for up to 100 rounds.
+export async function killProfileProcesses(uid: number, attempt = 0): Promise<void> {
+  if (attempt === 100) {
    throw new Error(`profile UID ${uid} still owns processes after cleanup`);
+  }
+  const ids = await profileProcessIds(uid);
+  if (ids.length === 0) {
+    return;
+  }
+  for (const pid of ids) {
+    killProcess(pid);
+  }
+  await sleep(10);
+  await killProfileProcesses(uid, attempt + 1);
 }

 export async function readProfileFile(profile: RuntimeProfile, path: string): Promise<string> {
-  const stat = await Deno.lstat(path);
-  if (!stat.isFile || stat.isSymlink || stat.uid !== profile.uid || (stat.mode! & 0o077) !== 0) {
+  const stat = await lstat(path);
+  if (
+    !stat.isFile() ||
+    stat.isSymbolicLink() ||
+    stat.uid !== profile.uid ||
+    (stat.mode & 0o077) !== 0
+  ) {
    throw new Error(`${path}: expected a profile-owned regular private file`);
  }
-  return await Deno.readTextFile(path);
+  return readFile(path, "utf8");
 }
@@ -1,129 +0,0 @@
-import { assertEquals, assertRejects } from "jsr:@std/assert@1";
-import {
-  agentCommand,
-  isRunnableProfileProcess,
-  killProfileProcesses,
-  readProfileFile,
-} from "./isolation.ts";
-import type { RuntimeProfile } from "./runtime.ts";
-
-const profile = (uid: number, home: string): RuntimeProfile => ({
-  index: uid - 20_000,
-  type: "claude",
-  model: "test",
-  uid,
-  gid: uid,
-  home,
-  tokenFile: null,
-});
-
-Deno.test("zombie process entries are already quiescent", () => {
-  const status = "State:\tZ (zombie)\nUid:\t20010\t20010\t20010\t20010\n";
-  assertEquals(isRunnableProfileProcess(status, 20_010), false);
-});
-
-Deno.test({
-  name: "refuses to read a profile result symlink as root",
-  permissions: { read: true, write: true, sys: ["uid"] },
-  async fn() {
-    if (Deno.build.os === "windows") return;
-    const root = await Deno.makeTempDir();
-    try {
-      const secret = `${root}/reviewer-token`;
-      const result = `${root}/result.md`;
-      await Deno.writeTextFile(secret, "reviewer-secret", { mode: 0o600 });
-      await Deno.symlink(secret, result);
-
-      await assertRejects(
-        () => readProfileFile(profile(Deno.uid()!, root), result),
-        Error,
-        "regular private file",
-      );
-    } finally {
-      await Deno.remove(root, { recursive: true });
-    }
-  },
-});
-
-Deno.test({
-  name: "a profile process can read only its own private files",
-  permissions: { read: true, write: true, run: true, sys: ["uid"] },
-  async fn() {
-    if (Deno.uid() !== 0) return;
-    const root = await Deno.makeTempDir();
-    await Deno.chmod(root, 0o711);
-    try {
-      const homeA = `${root}/a`;
-      const homeB = `${root}/b`;
-      await Deno.mkdir(homeA, { mode: 0o700 });
-      await Deno.mkdir(homeB, { mode: 0o700 });
-      await Deno.chown(homeA, 20_000, 20_000);
-      await Deno.chown(homeB, 20_001, 20_001);
-      await Deno.writeTextFile(`${homeA}/token`, "own", { mode: 0o600 });
-      await Deno.chown(`${homeA}/token`, 20_000, 20_000);
-      await Deno.writeTextFile(`${homeB}/token`, "sibling", { mode: 0o600 });
-      await Deno.chown(`${homeB}/token`, 20_001, 20_001);
-      await Deno.writeTextFile(`${root}/reviewer`, "root", { mode: 0o600 });
-
-      const selected = profile(20_000, homeA);
-      const own = await agentCommand(selected, "/bin/cat", [`${homeA}/token`], {
-        cwd: "/",
-      }).output();
-      const sibling = await agentCommand(selected, "/bin/cat", [`${homeB}/token`], {
-        cwd: "/",
-      }).output();
-      const reviewer = await agentCommand(selected, "/bin/cat", [`${root}/reviewer`], {
-        cwd: "/",
-      }).output();
-
-      assertEquals(new TextDecoder().decode(own.stdout), "own");
-      assertEquals(own.success, true);
-      assertEquals(sibling.success, false);
-      assertEquals(reviewer.success, false);
-    } finally {
-      await Deno.remove(root, { recursive: true });
-    }
-  },
-});
-
-Deno.test({
-  name: "cleanup leaves no runnable daemonized process",
-  permissions: "inherit",
-  async fn() {
-    if (Deno.uid() !== 0) return;
-    const selected = profile(20_010, "/tmp");
-    const launched = await agentCommand(
-      selected,
-      "/bin/sh",
-      ["-c", "sleep 60 >/dev/null 2>&1 & echo $!"],
-      { cwd: "/" },
-    ).output();
-    const pid = Number(new TextDecoder().decode(launched.stdout).trim());
-    assertEquals(Number.isInteger(pid), true);
-
-    await killProfileProcesses(selected.uid);
-
-    const status = await Deno.readTextFile(`/proc/${pid}/status`).catch((error) => {
-      if (error instanceof Deno.errors.NotFound) return null;
-      throw error;
-    });
-    assertEquals(status === null || !isRunnableProfileProcess(status, selected.uid), true);
-  },
-});
-
-Deno.test({
-  name: "the agent process cannot read its coordinator environment",
-  permissions: { run: true, sys: ["uid"] },
-  async fn() {
-    if (Deno.uid() !== 0) return;
-    const selected = profile(20_020, "/tmp");
-    const result = await agentCommand(selected, "/usr/bin/cat", [`/proc/${Deno.pid}/environ`], {
-      cwd: "/",
-      env: { PARENT_SECRET: "must-not-cross-boundary" },
-      clearEnv: true,
-      stderr: "piped",
-    }).output();
-
-    assertEquals(result.success, false);
-  },
-});
@@ -0,0 +1,12 @@
+// Type guards for values read from JSON, which arrive as `unknown`.
+export type JsonObject = Record<string, unknown>;
+
+// Any non-null object, arrays included: reading a missing key yields undefined.
+export function isObject(value: unknown): value is JsonObject {
+  return typeof value === "object" && value !== null;
+}
+
+// A plain mapping, which an array is not.
+export function isMapping(value: unknown): value is JsonObject {
+  return isObject(value) && !Array.isArray(value);
+}
@@ -1,4 +1,4 @@
-import { assertEquals, assertInstanceOf, assertRejects, assertThrows } from "jsr:@std/assert@1";
+import { assert, expect, test } from "vite-plus/test";
 import {
  collectOpenCodeOutput,
  openCodeArgs,
@@ -7,8 +7,8 @@ import {
 } from "./opencode.ts";
 import { AgentAuthError } from "./profiles.ts";

-Deno.test("builds a non-interactive auto-approved OpenCode command", () => {
-  assertEquals(openCodeArgs("openrouter/qwen/qwen3.8-27b", "Review this"), [
+test("builds a non-interactive auto-approved OpenCode command", () => {
+  expect(openCodeArgs("openrouter/qwen/qwen3.8-27b", "Review this")).toStrictEqual([
    "run",
    "--format",
    "json",
@@ -19,8 +19,8 @@ Deno.test("builds a non-interactive auto-approved OpenCode command", () => {
  ]);
 });

-Deno.test("returns the final visible OpenCode text event", () => {
-  assertEquals(
+test("returns the final visible OpenCode text event", () => {
+  expect(
    parseOpenCodeEvents(
      [
        JSON.stringify({ type: "step_start", part: { type: "step-start" } }),
@@ -29,23 +29,19 @@ Deno.test("returns the final visible OpenCode text event", () => {
        JSON.stringify({ type: "step_finish", part: { type: "step-finish" } }),
      ].join("\n"),
    ),
-    "done",
-  );
+  ).toBe("done");
 });

-Deno.test("rejects a successful OpenCode run without visible text", async () => {
-  await assertRejects(
-    async () => {
+test("rejects a successful OpenCode run without visible text", async () => {
+  await expect(async () => {
    parseOpenCodeEvents('{"type":"step_start"}');
    await Promise.resolve();
-    },
-    Error,
-    "no text output",
-  );
+  }).rejects.toThrow("no text output");
 });

-Deno.test("streams OpenCode output while collecting it", async () => {
-  const encode = (value: string) => new TextEncoder().encode(value);
+const encode = (value: string): Uint8Array => new TextEncoder().encode(value);
+
+test("streams OpenCode output while collecting it", async () => {
  const stdout = new ReadableStream<Uint8Array>({
    start(controller) {
      controller.enqueue(encode("first\n"));
@@ -72,8 +68,8 @@ Deno.test("streams OpenCode output while collecting it", async () => {
    },
  );

-  assertEquals(result, { stdout: "first\nsecond\n", stderr: "warning\n" });
-  assertEquals(shown, ["out:first\n", "err:warning\n", "out:second\n"]);
+  expect(result).toStrictEqual({ stdout: "first\nsecond\n", stderr: "warning\n" });
+  expect(shown).toStrictEqual(["out:first\n", "err:warning\n", "out:second\n"]);
 });

 const openRouterError = (statusCode: number, message: string): string =>
@@ -91,21 +87,17 @@ const openRouterError = (statusCode: number, message: string): string =>
    },
  });

-Deno.test("reports a rejected OpenRouter key as a sign-in failure", () => {
+test("reports a rejected OpenRouter key as a sign-in failure", () => {
  const error = openCodeError(openRouterError(401, "User not found."));
-  assertInstanceOf(error, AgentAuthError);
-  assertEquals(error.message, "opencode sign-in failed");
-  assertEquals(
-    (error.cause as Error).message,
-    "opencode APIError (API error 401): User not found.",
-  );
+  assert.instanceOf(error, AgentAuthError);
+  expect(error.message).toBe("opencode sign-in failed");
+  assert.instanceOf(error.cause, Error);
+  expect(error.cause.message).toBe("opencode APIError (API error 401): User not found.");
 });

-Deno.test("surfaces an OpenCode error event instead of empty output", () => {
-  assertThrows(
-    () => parseOpenCodeEvents(openRouterError(429, "Rate limit exceeded")),
-    Error,
+test("surfaces an OpenCode error event instead of empty output", () => {
+  expect(() => parseOpenCodeEvents(openRouterError(429, "Rate limit exceeded"))).toThrow(
    "API error 429",
  );
-  assertEquals(openCodeError('{"type":"text","part":{"text":"ok"}}'), undefined);
+  expect(openCodeError('{"type":"text","part":{"text":"ok"}}')).toBe(undefined);
 });
@@ -1,3 +1,4 @@
+import { isObject } from "./json.ts";
 import { AgentAuthError } from "./profiles.ts";

 export function openCodeArgs(model: string, prompt: string): string[] {
@@ -7,12 +8,12 @@ export function openCodeArgs(model: string, prompt: string): string[] {
 type ChunkWriter = (chunk: Uint8Array) => void | Promise<void>;

 export async function collectOpenCodeOutput(
-  stdout: ReadableStream<Uint8Array>,
-  stderr: ReadableStream<Uint8Array>,
+  stdout: AsyncIterable<Uint8Array>,
+  stderr: AsyncIterable<Uint8Array>,
  writeStdout: ChunkWriter,
  writeStderr: ChunkWriter,
 ): Promise<{ stdout: string; stderr: string }> {
-  const collect = async (stream: ReadableStream<Uint8Array>, write: ChunkWriter) => {
+  const collect = async (stream: AsyncIterable<Uint8Array>, write: ChunkWriter) => {
    const chunks: Uint8Array[] = [];
    for await (const chunk of stream) {
      chunks.push(chunk);
@@ -47,13 +48,13 @@ export function openCodeError(output: string): Error | undefined {
    } catch {
      continue;
    }
-    if (typeof event !== "object" || event === null) continue;
-    const { type, error } = event as Record<string, unknown>;
-    if (type !== "error" || typeof error !== "object" || error === null) {
+    if (!isObject(event)) continue;
+    const { type, error } = event;
+    if (type !== "error" || !isObject(error)) {
      continue;
    }
-    const { name, data } = error as Record<string, unknown>;
-    const { message, statusCode } = (data ?? {}) as Record<string, unknown>;
+    const { name, data } = error;
+    const { message, statusCode } = isObject(data) ? data : {};
    const detail = `opencode ${typeof name === "string" ? name : "error"}${
      typeof statusCode === "number" ? ` (API error ${statusCode})` : ""
    }: ${typeof message === "string" ? message : "unknown error"}`;
@@ -72,10 +73,10 @@ export function parseOpenCodeEvents(output: string): string {
  for (const line of output.split("\n")) {
    if (line.trim() === "") continue;
    const event: unknown = JSON.parse(line);
-    if (typeof event !== "object" || event === null) continue;
-    const { type, part } = event as Record<string, unknown>;
-    if (type !== "text" || typeof part !== "object" || part === null) continue;
-    const text = (part as Record<string, unknown>).text;
+    if (!isObject(event)) continue;
+    const { type, part } = event;
+    if (type !== "text" || !isObject(part)) continue;
+    const { text } = part;
    if (typeof text === "string" && text.trim() !== "") result = text;
  }
  if (result === undefined) {
@@ -0,0 +1,114 @@
+// Reads what the agent phase left behind: its outcome, and the review and
+// anchors files it wrote into a profile home.
+import type { Stats } from "node:fs";
+import { lstat, readFile } from "node:fs/promises";
+import { join } from "node:path";
+
+import { isNotFound } from "./errors.ts";
+import { isObject } from "./json.ts";
+import { isFailureReason, isProfileType } from "./profiles.ts";
+import type { ProfileFailure } from "./profiles.ts";
+import type { RuntimeManifest, RuntimeOutcome } from "./runtime.ts";
+
+export interface Anchor {
+  path: string;
+  line: number;
+  side: "new" | "old";
+  body: string;
+}
+
+function parseAnchor(entry: unknown, at: string): Anchor {
+  if (!isObject(entry)) {
+    throw new TypeError(`${at}: not an object`);
+  }
+  const { path, line, side = "new", body } = entry;
+  if (typeof path !== "string" || path === "") {
+    throw new TypeError(`${at}.path: expected a repository path`);
+  }
+  if (typeof line !== "number" || !Number.isInteger(line) || line < 1) {
+    throw new TypeError(`${at}.line: expected a line number`);
+  }
+  if (side !== "new" && side !== "old") {
+    throw new Error(`${at}.side: expected "new" or "old"`);
+  }
+  if (typeof body !== "string" || body.trim() === "") {
+    throw new TypeError(`${at}.body: expected the finding`);
+  }
+  return { path, line, side, body };
+}
+
+export function parseAnchors(text: string, sourcePath: string): Anchor[] {
+  const entries: unknown = JSON.parse(text);
+  if (!Array.isArray(entries)) {
+    throw new TypeError(`${sourcePath}: not an array`);
+  }
+  return entries.map((entry: unknown, index) => parseAnchor(entry, `${sourcePath}[${index}]`));
+}
+
+// Only known labels reach the comment, never raw agent output.
+function knownFailures(failures: unknown): ProfileFailure[] {
+  return (Array.isArray(failures) ? failures : []).flatMap((entry: unknown) => {
+    if (!isObject(entry)) {
+      return [];
+    }
+    const { type, model, reason } = entry;
+    return isProfileType(type) && typeof model === "string" && isFailureReason(reason)
+      ? [{ type, model, reason }]
+      : [];
+  });
+}
+
+export async function readOutcome(path: string): Promise<RuntimeOutcome> {
+  const value: unknown = JSON.parse(await readFile(path, "utf8"));
+  if (!isObject(value) || !("ok" in value)) {
+    throw new Error("invalid agent outcome");
+  }
+  if (value.ok === false) {
+    return { ok: false, failures: knownFailures(value.failures) };
+  }
+  const { ok, body, reviewPath, anchorsPath, profile } = value;
+  if (
+    ok !== true ||
+    typeof body !== "string" ||
+    typeof reviewPath !== "string" ||
+    typeof anchorsPath !== "string" ||
+    !isObject(profile) ||
+    !isProfileType(profile.type) ||
+    typeof profile.model !== "string"
+  ) {
+    throw new Error("invalid agent outcome");
+  }
+  return {
+    ok: true,
+    body,
+    reviewPath,
+    anchorsPath,
+    profile: { type: profile.type, model: profile.model },
+  };
+}
+
+export async function readAgentArtifact(
+  manifest: RuntimeManifest,
+  path: string,
+  name: string,
+): Promise<string | null> {
+  const profile = manifest.profiles.find((entry) => join(entry.home, name) === path);
+  if (profile === undefined) throw new Error(`${name}: outside profile home`);
+  let stat: Stats;
+  try {
+    stat = await lstat(path);
+  } catch (error) {
+    if (isNotFound(error)) return null;
+    throw error;
+  }
+  if (
+    !stat.isFile() ||
+    stat.isSymbolicLink() ||
+    stat.uid !== profile.uid ||
+    (stat.mode & 0o077) !== 0
+  ) {
+    throw new Error(`${name}: expected a profile-owned regular private file`);
+  }
+  const text = await readFile(path, "utf8");
+  return text === "" ? null : text;
+}
@@ -0,0 +1,296 @@
+import { chmod, mkdir, rm, stat, symlink, writeFile } from "node:fs/promises";
+
+import { assert, expect, test } from "vite-plus/test";
+
+import { isNotFound } from "./errors.ts";
+import { postRuntime } from "./post.ts";
+import type { PostContext } from "./post.ts";
+import type { RuntimeManifest, RuntimeOutcome } from "./runtime.ts";
+import { currentGid, currentUid, IS_WINDOWS, makeTempDir } from "./testing.ts";
+
+const context: PostContext = {
+  apiUrl: "https://gitea.example/api/v1",
+  repository: "owner/repo",
+  issueIndex: "7",
+  eventName: "issue_comment",
+};
+
+interface Fixture {
+  manifestPath: string;
+  runtimeDir: string;
+  reviewerFile: string;
+  reviewPath: string;
+  outcomeFile: string;
+}
+
+type FixtureSource = Extract<RuntimeOutcome, { ok: false }> | { ok: true; body: string };
+
+async function writePrivate(path: string, text: string): Promise<void> {
+  await writeFile(path, text, { mode: 0o600 });
+  await chmod(path, 0o600);
+}
+
+async function writeArtifacts(
+  outcome: RuntimeOutcome,
+  review: string | undefined,
+  anchors: unknown,
+): Promise<void> {
+  if (!outcome.ok) return;
+  if (review !== undefined) await writePrivate(outcome.reviewPath, review);
+  if (anchors !== undefined) await writePrivate(outcome.anchorsPath, JSON.stringify(anchors));
+}
+
+function manifestFor(runtimeDir: string, profileHome: string): RuntimeManifest {
+  return {
+    runtimeDir,
+    manifestPath: `${runtimeDir}/manifest.json`,
+    reviewerFile: `${runtimeDir}/reviewer-token`,
+    outcomeFile: `${runtimeDir}/outcome.json`,
+    profiles: [
+      {
+        index: 0,
+        type: "claude",
+        model: "test",
+        uid: currentUid(),
+        gid: currentGid(),
+        home: profileHome,
+        tokenFile: null,
+      },
+    ],
+  };
+}
+
+async function fixture(
+  source: FixtureSource,
+  review?: string,
+  anchors?: unknown,
+): Promise<Fixture> {
+  const runtimeDir = await makeTempDir();
+  const profileHome = `${runtimeDir}/profile-0`;
+  const manifest = manifestFor(runtimeDir, profileHome);
+  await mkdir(profileHome);
+  await writeFile(manifest.reviewerFile, "reviewer-secret");
+  const outcome: RuntimeOutcome = source.ok
+    ? {
+        ...source,
+        profile: { type: "codex", model: "gpt-test" },
+        reviewPath: `${profileHome}/review.md`,
+        anchorsPath: `${profileHome}/anchors.json`,
+      }
+    : source;
+  await writeFile(manifest.outcomeFile, JSON.stringify(outcome));
+  await writeArtifacts(outcome, review, anchors);
+  await writeFile(manifest.manifestPath, JSON.stringify(manifest));
+  const { manifestPath, reviewerFile, outcomeFile } = manifest;
+  return {
+    manifestPath,
+    runtimeDir,
+    reviewerFile,
+    reviewPath: `${profileHome}/review.md`,
+    outcomeFile,
+  };
+}
+
+const missing = async (path: string): Promise<boolean> => {
+  try {
+    await stat(path);
+    return false;
+  } catch (error) {
+    if (isNotFound(error)) return true;
+    throw error;
+  }
+};
+
+// The JSON body of one request the fake Gitea received.
+function requestBody(init?: RequestInit): unknown {
+  return typeof init?.body === "string" ? JSON.parse(init.body) : undefined;
+}
+
+// A fake Gitea that records each request body and answers with `status`.
+function recordingFetch(bodies: unknown[], status = 201): typeof fetch {
+  return (_url, init) => {
+    bodies.push(requestBody(init));
+    return Promise.resolve(new Response(null, { status }));
+  };
+}
+
+test("posts a successful issue result and removes runtime credentials", async () => {
+  const result = await fixture({ ok: true, body: "done" });
+  const requests: { url: unknown; init: RequestInit | undefined }[] = [];
+
+  await postRuntime(result.manifestPath, context, (url, init) => {
+    requests.push({ url, init });
+    return Promise.resolve(new Response(null, { status: 201 }));
+  });
+
+  expect(requests.length).toBe(1);
+  const [request] = requests;
+  expect(request?.url).toStrictEqual(`${context.apiUrl}/repos/owner/repo/issues/7/comments`);
+  expect(requestBody(request?.init)).toStrictEqual({
+    body: "done\n\n> Profile: `codex` · `gpt-test`",
+  });
+  expect(request?.init?.headers).toStrictEqual({
+    Authorization: "token reviewer-secret",
+    "Content-Type": "application/json",
+  });
+  assert(await missing(result.runtimeDir));
+});
+
+test("retries a rejected inline review without anchors", async () => {
+  const result = await fixture({ ok: true, body: "ignored final response" }, "Approved\nReady", [
+    { path: "run.ts", line: 1, side: "new", body: "Finding" },
+  ]);
+  const bodies: unknown[] = [];
+
+  await postRuntime(
+    result.manifestPath,
+    {
+      ...context,
+      eventName: "pull_request",
+    },
+    (_url, init) => {
+      bodies.push(requestBody(init));
+      return Promise.resolve(new Response(null, { status: bodies.length === 1 ? 422 : 200 }));
+    },
+  );
+
+  expect(bodies[0]).toMatchObject({
+    comments: [{ body: "Finding\n\n> Profile: `codex` · `gpt-test`" }],
+  });
+  expect(bodies[1]).toMatchObject({
+    comments: [],
+    body: "✅ Approved\nReady\n\n> Profile: `codex` · `gpt-test`",
+  });
+  assert(await missing(result.runtimeDir));
+});
+
+test("reports each tried profile and keeps the action failed", async () => {
+  const result = await fixture({
+    ok: false,
+    failures: [
+      { type: "codex", model: "gpt-test", reason: "sign-in failed" },
+      { type: "claude", model: "claude-test", reason: "usage exhausted" },
+      { type: "opencode", model: "openrouter/test", reason: "failed" },
+    ],
+  });
+  const bodies: unknown[] = [];
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
+  ).rejects.toThrow("agent phase failed");
+
+  expect(bodies).toStrictEqual([
+    {
+      body:
+        "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (sign-in failed), " +
+        "`claude` · `claude-test` (usage exhausted), " +
+        "`opencode` · `openrouter/test` (failed)",
+    },
+  ]);
+  assert(!JSON.stringify(bodies).includes("reviewer-secret"));
+  assert(await missing(result.runtimeDir));
+});
+
+test("drops failure entries that are not known labels", async () => {
+  const result = await fixture({ ok: false, failures: [] });
+  await writeFile(
+    result.outcomeFile,
+    JSON.stringify({
+      ok: false,
+      failures: [
+        { type: "codex", model: "gpt-test", reason: "token sk-secret leaked" },
+        { type: "shell", model: "x", reason: "failed" },
+        { type: "claude", model: "claude-test", reason: "sign-in failed" },
+      ],
+    }),
+  );
+  const bodies: unknown[] = [];
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
+  ).rejects.toThrow("agent phase failed");
+
+  expect(bodies).toStrictEqual([
+    {
+      body: "AI bot failed.\n\n> Tried: `claude` · `claude-test` (sign-in failed)",
+    },
+  ]);
+});
+
+test("reports a generic failure when the runner wrote no outcome", async () => {
+  const result = await fixture({ ok: false, failures: [] });
+  await rm(result.outcomeFile);
+  const bodies: unknown[] = [];
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
+  ).rejects.toThrow("agent phase failed");
+
+  expect(bodies).toStrictEqual([{ body: "AI bot failed.\n\n> Profile: none" }]);
+  assert(await missing(result.runtimeDir));
+});
+
+test("removes runtime credentials when posting fails", async () => {
+  const result = await fixture({ ok: true, body: "done" });
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, () =>
+      Promise.resolve(new Response("failed", { status: 500 })),
+    ),
+  ).rejects.toThrow("500");
+  assert(await missing(result.runtimeDir));
+});
+
+test("preserves a Gitea transport failure without retrying a comment", async () => {
+  const result = await fixture({ ok: true, body: "done" });
+  let requests = 0;
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, () => {
+      requests += 1;
+      return Promise.reject(new Error(`network failure ${requests}`));
+    }),
+  ).rejects.toThrow("network failure 1");
+
+  expect(requests).toBe(1);
+  assert(await missing(result.runtimeDir));
+});
+
+test.skipIf(IS_WINDOWS)("refuses to follow an agent artifact symlink", async () => {
+  const result = await fixture({ ok: true, body: "done" });
+  await symlink(result.reviewerFile, result.reviewPath);
+  let requests = 0;
+
+  await expect(() =>
+    postRuntime(result.manifestPath, context, () => {
+      requests += 1;
+      return Promise.resolve(new Response(null, { status: 200 }));
+    }),
+  ).rejects.toThrow("regular private file");
+
+  expect(requests).toBe(1);
+  assert(await missing(result.runtimeDir));
+});
+
+test("reports an attributed failure when a pull request review is missing", async () => {
+  const result = await fixture({ ok: true, body: "done" });
+  const bodies: unknown[] = [];
+
+  await expect(() =>
+    postRuntime(
+      result.manifestPath,
+      {
+        ...context,
+        eventName: "pull_request",
+      },
+      recordingFetch(bodies),
+    ),
+  ).rejects.toThrow("did not write");
+
+  expect(bodies).toStrictEqual([
+    {
+      body: "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (failed)",
+    },
+  ]);
+  assert(await missing(result.runtimeDir));
+});
@@ -1,147 +1,48 @@
-import { join } from "jsr:@std/path@1";
-import { readRuntimeManifest, type RuntimeManifest, type RuntimeOutcome } from "./runtime.ts";
-import { failureFooter, type FailureReason, type ProfileFailure, withProfile } from "./profiles.ts";
+import { readFile, rm } from "node:fs/promises";
+import process from "node:process";

-export type PostContext = {
+import { isNotFound } from "./errors.ts";
+import { parseAnchors, readAgentArtifact, readOutcome } from "./post-artifacts.ts";
+import type { Anchor } from "./post-artifacts.ts";
+import { failureFooter, withProfile } from "./profiles.ts";
+import type { ProfileFailure } from "./profiles.ts";
+import { readRuntimeManifest } from "./runtime.ts";
+import type { RuntimeManifest, RuntimeOutcome } from "./runtime.ts";
+
+export interface PostContext {
  apiUrl: string;
  repository: string;
  issueIndex: string;
  eventName: string;
-};
+}

-type Anchor = {
-  path: string;
-  line: number;
-  side: "new" | "old";
-  body: string;
-};
+type SuccessOutcome = Extract<RuntimeOutcome, { ok: true }>;

-const ANSI = new RegExp(`${String.fromCharCode(27)}\\[[0-9;]*[A-Za-z]`, "g");
+type GiteaRequest = (path: string, body: unknown) => Promise<void>;
+
+// The reviewer's view of one issue or pull request.
+interface Publisher {
+  context: PostContext;
+  request: GiteaRequest;
+  postComment(body: string): Promise<void>;
+}
+
+const ANSI = new RegExp(`${String.fromCodePoint(27)}\\[[0-9;]*[A-Za-z]`, "gu");
 const stripAnsi = (text: string): string => text.replace(ANSI, "");
 const VERDICTS: Record<string, [event: string, mark: string]> = {
  Approved: ["APPROVED", "✅"],
  "Changes requested": ["REQUEST_CHANGES", "🛑"],
 };
-const PROFILE_TYPES = ["claude", "codex", "opencode"];
-const FAILURE_REASONS = ["sign-in failed", "usage exhausted", "failed"];
 const failureComment = (failures: ProfileFailure[]): string =>
  `AI bot failed.\n\n${failureFooter(failures)}`;

 class GiteaRequestError extends Error {}

-function parseAnchors(text: string, sourcePath: string): Anchor[] {
-  const entries: unknown = JSON.parse(text);
-  if (!Array.isArray(entries)) throw new Error(`${sourcePath}: not an array`);
-  return entries.map((entry: unknown, index) => {
-    const at = `${sourcePath}[${index}]`;
-    if (typeof entry !== "object" || entry === null) {
-      throw new Error(`${at}: not an object`);
-    }
-    const { path, line, side = "new", body } = entry as Record<string, unknown>;
-    if (typeof path !== "string" || path === "") {
-      throw new Error(`${at}.path: expected a repository path`);
-    }
-    if (typeof line !== "number" || !Number.isInteger(line) || line < 1) {
-      throw new Error(`${at}.line: expected a line number`);
-    }
-    if (side !== "new" && side !== "old") {
-      throw new Error(`${at}.side: expected \"new\" or \"old\"`);
-    }
-    if (typeof body !== "string" || body.trim() === "") {
-      throw new Error(`${at}.body: expected the finding`);
-    }
-    return { path, line, side, body };
-  });
-}
-
-async function readOutcome(path: string): Promise<RuntimeOutcome> {
-  const value: unknown = JSON.parse(await Deno.readTextFile(path));
-  if (typeof value !== "object" || value === null || !("ok" in value)) {
-    throw new Error("invalid agent outcome");
-  }
-  const outcome = value as Record<string, unknown>;
-  if (outcome.ok === false) {
-    // Only known labels reach the comment, never raw agent output.
-    const failures = Array.isArray(outcome.failures) ? outcome.failures : [];
-    return {
-      ok: false,
-      failures: failures.flatMap((entry: unknown) => {
-        const { type, model, reason } = (entry ?? {}) as Record<string, unknown>;
-        return typeof type === "string" &&
-          PROFILE_TYPES.includes(type) &&
-          typeof model === "string" &&
-          typeof reason === "string" &&
-          FAILURE_REASONS.includes(reason)
-          ? [
-              {
-                type: type as ProfileFailure["type"],
-                model,
-                reason: reason as FailureReason,
-              },
-            ]
-          : [];
-      }),
-    };
-  }
-  if (
-    outcome.ok !== true ||
-    typeof outcome.body !== "string" ||
-    typeof outcome.reviewPath !== "string" ||
-    typeof outcome.anchorsPath !== "string" ||
-    typeof outcome.profile !== "object" ||
-    outcome.profile === null
-  ) {
-    throw new Error("invalid agent outcome");
-  }
-  const profile = outcome.profile as Record<string, unknown>;
-  if (typeof profile.type !== "string" || typeof profile.model !== "string") {
-    throw new Error("invalid agent outcome");
-  }
-  return {
-    ok: true,
-    body: outcome.body,
-    reviewPath: outcome.reviewPath,
-    anchorsPath: outcome.anchorsPath,
-    profile: {
-      type: profile.type as "claude" | "codex" | "opencode",
-      model: profile.model,
-    },
-  };
-}
-
-async function readAgentArtifact(
-  manifest: RuntimeManifest,
-  path: string,
-  name: string,
-): Promise<string | null> {
-  const profile = manifest.profiles.find((entry) => join(entry.home, name) === path);
-  if (profile === undefined) throw new Error(`${name}: outside profile home`);
-  let stat: Deno.FileInfo;
-  try {
-    stat = await Deno.lstat(path);
-  } catch (error) {
-    if (error instanceof Deno.errors.NotFound) return null;
-    throw error;
-  }
-  if (!stat.isFile || stat.isSymlink || stat.uid !== profile.uid || (stat.mode! & 0o077) !== 0) {
-    throw new Error(`${name}: expected a profile-owned regular private file`);
-  }
-  const text = await Deno.readTextFile(path);
-  return text === "" ? null : text;
-}
-
-export async function postRuntime(
-  manifestPath: string,
-  context: PostContext,
-  fetcher: typeof fetch = fetch,
-): Promise<void> {
-  const manifest = await readRuntimeManifest(manifestPath);
-  try {
-    const reviewerToken = (await Deno.readTextFile(manifest.reviewerFile)).trim();
-    const request = async (path: string, body: unknown): Promise<void> => {
+function giteaRequest(apiUrl: string, reviewerToken: string, fetcher: typeof fetch): GiteaRequest {
+  return async (path, body) => {
    let response: Response;
    try {
-        response = await fetcher(`${context.apiUrl}/${path}`, {
+      response = await fetcher(`${apiUrl}/${path}`, {
        method: "POST",
        headers: {
          Authorization: `token ${reviewerToken}`,
@@ -157,39 +58,37 @@ export async function postRuntime(
      throw new GiteaRequestError(`${path}: ${response.status} ${await response.text()}`);
    }
  };
-    const postComment = (body: string) =>
-      request(`repos/${context.repository}/issues/${context.issueIndex}/comments`, {
-        body: stripAnsi(body),
-      });
+}

+async function readSuccess(
+  manifest: RuntimeManifest,
+  publisher: Publisher,
+): Promise<SuccessOutcome> {
  let outcome: RuntimeOutcome;
  try {
    outcome = await readOutcome(manifest.outcomeFile);
  } catch (error) {
-      await postComment(failureComment([]));
+    await publisher.postComment(failureComment([]));
    throw new Error("agent phase failed", { cause: error });
  }
  if (!outcome.ok) {
-      await postComment(failureComment(outcome.failures));
+    await publisher.postComment(failureComment(outcome.failures));
    throw new Error("agent phase failed");
  }
+  return outcome;
+}

-    try {
-      const review = await readAgentArtifact(manifest, outcome.reviewPath, "review.md");
-      if (review === null) {
-        if (context.eventName === "pull_request") {
-          throw new Error("agent did not write a pull request review");
-        }
-        await postComment(withProfile(outcome.body, outcome.profile));
-        return;
-      }
-
-      const [verdict, ...rest] = review.split("\n");
+async function postReview(
+  publisher: Publisher,
+  outcome: SuccessOutcome,
+  review: string,
+  anchors: Anchor[],
+): Promise<void> {
+  const { context, request } = publisher;
+  const [verdict = "", ...rest] = review.split("\n");
  const [event, mark] = VERDICTS[verdict.trim()] ?? ["COMMENT", "💬"];
-      const anchorText = await readAgentArtifact(manifest, outcome.anchorsPath, "anchors.json");
-      const anchors = anchorText === null ? [] : parseAnchors(anchorText, outcome.anchorsPath);
-      const postReview = (entries: Anchor[]) =>
-        request(`repos/${context.repository}/pulls/${context.issueIndex}/reviews`, {
+  const send = async (entries: Anchor[]): Promise<void> => {
+    await request(`repos/${context.repository}/pulls/${context.issueIndex}/reviews`, {
      body: stripAnsi(
        withProfile([`${mark} ${verdict.trim()}`, ...rest].join("\n"), outcome.profile),
      ),
@@ -201,29 +100,82 @@ export async function postRuntime(
        old_position: side === "old" ? line : 0,
      })),
    });
-      await postReview(anchors).catch(async (error: Error) => {
+  };
+  await send(anchors).catch(async (error: unknown) => {
    if (anchors.length === 0) throw error;
-        console.error(`inline comments rejected: ${error.message}`);
-        await postReview([]);
+    console.error(
+      `inline comments rejected: ${error instanceof Error ? error.message : String(error)}`,
+    );
+    await send([]);
  });
+}
+
+async function publishResult(
+  manifest: RuntimeManifest,
+  outcome: SuccessOutcome,
+  publisher: Publisher,
+): Promise<void> {
+  const review = await readAgentArtifact(manifest, outcome.reviewPath, "review.md");
+  if (review === null) {
+    if (publisher.context.eventName === "pull_request") {
+      throw new Error("agent did not write a pull request review");
+    }
+    await publisher.postComment(withProfile(outcome.body, outcome.profile));
+    return;
+  }
+  const anchorText = await readAgentArtifact(manifest, outcome.anchorsPath, "anchors.json");
+  const anchors = anchorText === null ? [] : parseAnchors(anchorText, outcome.anchorsPath);
+  await postReview(publisher, outcome, review, anchors);
+}
+
+async function publish(
+  manifest: RuntimeManifest,
+  context: PostContext,
+  fetcher: typeof fetch,
+): Promise<void> {
+  const reviewerToken = (await readFile(manifest.reviewerFile, "utf8")).trim();
+  const request = giteaRequest(context.apiUrl, reviewerToken, fetcher);
+  const publisher: Publisher = {
+    context,
+    request,
+    postComment: async (body) => {
+      await request(`repos/${context.repository}/issues/${context.issueIndex}/comments`, {
+        body: stripAnsi(body),
+      });
+    },
+  };
+  const outcome = await readSuccess(manifest, publisher);
+  try {
+    await publishResult(manifest, outcome, publisher);
  } catch (error) {
    if (error instanceof GiteaRequestError) throw error;
-      await postComment(failureComment([{ ...outcome.profile, reason: "failed" }]));
+    await publisher.postComment(failureComment([{ ...outcome.profile, reason: "failed" }]));
    throw error;
  }
+}
+
+export async function postRuntime(
+  manifestPath: string,
+  context: PostContext,
+  fetcher: typeof fetch = fetch,
+): Promise<void> {
+  const manifest = await readRuntimeManifest(manifestPath);
+  try {
+    await publish(manifest, context, fetcher);
  } finally {
-    await Deno.remove(manifest.runtimeDir, { recursive: true }).catch((error) => {
-      if (!(error instanceof Deno.errors.NotFound)) throw error;
+    await rm(manifest.runtimeDir, { recursive: true }).catch((error: unknown) => {
+      if (!isNotFound(error)) throw error;
    });
  }
 }

-if (import.meta.main) {
-  const required = (name: string): string => {
-    const value = Deno.env.get(name);
-    if (!value) throw new Error(`${name} is not set`);
+function required(name: string): string {
+  const value = process.env[name];
+  if (value === undefined || value === "") throw new Error(`${name} is not set`);
  return value;
-  };
+}
+
+if (import.meta.main) {
  await postRuntime(required("BOT_AGENTS_MANIFEST"), {
    apiUrl: required("GITEA_API_URL"),
    repository: required("GITEA_REPOSITORY"),
@@ -1,303 +0,0 @@
-import { assert, assertEquals, assertRejects } from "jsr:@std/assert@1";
-import { type PostContext, postRuntime } from "./post.ts";
-import type { RuntimeManifest, RuntimeOutcome } from "./runtime.ts";
-
-const context: PostContext = {
-  apiUrl: "https://gitea.example/api/v1",
-  repository: "owner/repo",
-  issueIndex: "7",
-  eventName: "issue_comment",
-};
-
-async function fixture(
-  source: Extract<RuntimeOutcome, { ok: false }> | { ok: true; body: string },
-  review?: string,
-  anchors?: unknown,
-): Promise<{
-  manifestPath: string;
-  runtimeDir: string;
-  reviewerFile: string;
-  reviewPath: string;
-  outcomeFile: string;
-}> {
-  const runtimeDir = await Deno.makeTempDir();
-  const reviewerFile = `${runtimeDir}/reviewer-token`;
-  const outcomeFile = `${runtimeDir}/outcome.json`;
-  const profileHome = `${runtimeDir}/profile-0`;
-  await Deno.mkdir(profileHome);
-  await Deno.writeTextFile(reviewerFile, "reviewer-secret");
-  const outcome: RuntimeOutcome = source.ok
-    ? {
-        ...source,
-        profile: { type: "codex", model: "gpt-test" },
-        reviewPath: `${profileHome}/review.md`,
-        anchorsPath: `${profileHome}/anchors.json`,
-      }
-    : source;
-  await Deno.writeTextFile(outcomeFile, JSON.stringify(outcome));
-  if (outcome.ok) {
-    if (review !== undefined) {
-      await Deno.writeTextFile(outcome.reviewPath, review, { mode: 0o600 });
-      await Deno.chmod(outcome.reviewPath, 0o600);
-    }
-    if (anchors !== undefined) {
-      await Deno.writeTextFile(outcome.anchorsPath, JSON.stringify(anchors), {
-        mode: 0o600,
-      });
-      await Deno.chmod(outcome.anchorsPath, 0o600);
-    }
-  }
-  const manifestPath = `${runtimeDir}/manifest.json`;
-  const manifest: RuntimeManifest = {
-    runtimeDir,
-    manifestPath,
-    reviewerFile,
-    outcomeFile,
-    profiles: [
-      {
-        index: 0,
-        type: "claude",
-        model: "test",
-        uid: Deno.uid()!,
-        gid: Deno.gid()!,
-        home: profileHome,
-        tokenFile: null,
-      },
-    ],
-  };
-  await Deno.writeTextFile(manifestPath, JSON.stringify(manifest));
-  return {
-    manifestPath,
-    runtimeDir,
-    reviewerFile,
-    reviewPath: `${profileHome}/review.md`,
-    outcomeFile,
-  };
-}
-
-const missing = async (path: string): Promise<boolean> => {
-  try {
-    await Deno.stat(path);
-    return false;
-  } catch (error) {
-    if (error instanceof Deno.errors.NotFound) return true;
-    throw error;
-  }
-};
-
-Deno.test("posts a successful issue result and removes runtime credentials", async () => {
-  const result = await fixture({ ok: true, body: "done" });
-  const requests: Array<{ url: string; init?: RequestInit }> = [];
-
-  await postRuntime(result.manifestPath, context, (url, init) => {
-    requests.push({ url: String(url), init });
-    return Promise.resolve(new Response(null, { status: 201 }));
-  });
-
-  assertEquals(requests.length, 1);
-  assertEquals(requests[0].url, `${context.apiUrl}/repos/owner/repo/issues/7/comments`);
-  assertEquals(JSON.parse(String(requests[0].init?.body)), {
-    body: "done\n\n> Profile: `codex` · `gpt-test`",
-  });
-  assertEquals(requests[0].init?.headers, {
-    Authorization: "token reviewer-secret",
-    "Content-Type": "application/json",
-  });
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("retries a rejected inline review without anchors", async () => {
-  const result = await fixture({ ok: true, body: "ignored final response" }, "Approved\nReady", [
-    { path: "run.ts", line: 1, side: "new", body: "Finding" },
-  ]);
-  const bodies: unknown[] = [];
-
-  await postRuntime(
-    result.manifestPath,
-    {
-      ...context,
-      eventName: "pull_request",
-    },
-    (_url, init) => {
-      bodies.push(JSON.parse(String(init?.body)));
-      return Promise.resolve(new Response(null, { status: bodies.length === 1 ? 422 : 200 }));
-    },
-  );
-
-  assertEquals((bodies[0] as { comments: unknown[] }).comments.length, 1);
-  assertEquals(
-    (bodies[0] as { comments: Array<{ body: string }> }).comments[0].body,
-    "Finding\n\n> Profile: `codex` · `gpt-test`",
-  );
-  assertEquals((bodies[1] as { comments: unknown[] }).comments, []);
-  assertEquals(
-    (bodies[1] as { body: string }).body,
-    "✅ Approved\nReady\n\n> Profile: `codex` · `gpt-test`",
-  );
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("reports each tried profile and keeps the action failed", async () => {
-  const result = await fixture({
-    ok: false,
-    failures: [
-      { type: "codex", model: "gpt-test", reason: "sign-in failed" },
-      { type: "claude", model: "claude-test", reason: "usage exhausted" },
-      { type: "opencode", model: "openrouter/test", reason: "failed" },
-    ],
-  });
-  const bodies: unknown[] = [];
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, (_url, init) => {
-        bodies.push(JSON.parse(String(init?.body)));
-        return Promise.resolve(new Response(null, { status: 201 }));
-      }),
-    Error,
-    "agent phase failed",
-  );
-
-  assertEquals(bodies, [
-    {
-      body:
-        "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (sign-in failed), " +
-        "`claude` · `claude-test` (usage exhausted), " +
-        "`opencode` · `openrouter/test` (failed)",
-    },
-  ]);
-  assert(!JSON.stringify(bodies).includes("reviewer-secret"));
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("drops failure entries that are not known labels", async () => {
-  const result = await fixture({ ok: false, failures: [] });
-  await Deno.writeTextFile(
-    result.outcomeFile,
-    JSON.stringify({
-      ok: false,
-      failures: [
-        { type: "codex", model: "gpt-test", reason: "token sk-secret leaked" },
-        { type: "shell", model: "x", reason: "failed" },
-        { type: "claude", model: "claude-test", reason: "sign-in failed" },
-      ],
-    }),
-  );
-  const bodies: unknown[] = [];
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, (_url, init) => {
-        bodies.push(JSON.parse(String(init?.body)));
-        return Promise.resolve(new Response(null, { status: 201 }));
-      }),
-    Error,
-    "agent phase failed",
-  );
-
-  assertEquals(bodies, [
-    {
-      body: "AI bot failed.\n\n> Tried: `claude` · `claude-test` (sign-in failed)",
-    },
-  ]);
-});
-
-Deno.test("reports a generic failure when the runner wrote no outcome", async () => {
-  const result = await fixture({ ok: false, failures: [] });
-  await Deno.remove(result.outcomeFile);
-  const bodies: unknown[] = [];
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, (_url, init) => {
-        bodies.push(JSON.parse(String(init?.body)));
-        return Promise.resolve(new Response(null, { status: 201 }));
-      }),
-    Error,
-    "agent phase failed",
-  );
-
-  assertEquals(bodies, [{ body: "AI bot failed.\n\n> Profile: none" }]);
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("removes runtime credentials when posting fails", async () => {
-  const result = await fixture({ ok: true, body: "done" });
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, () =>
-        Promise.resolve(new Response("failed", { status: 500 })),
-      ),
-    Error,
-    "500",
-  );
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("preserves a Gitea transport failure without retrying a comment", async () => {
-  const result = await fixture({ ok: true, body: "done" });
-  let requests = 0;
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, () => {
-        requests++;
-        return Promise.reject(new Error(`network failure ${requests}`));
-      }),
-    Error,
-    "network failure 1",
-  );
-
-  assertEquals(requests, 1);
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("refuses to follow an agent artifact symlink", async () => {
-  if (Deno.build.os === "windows") return;
-  const result = await fixture({ ok: true, body: "done" });
-  await Deno.symlink(result.reviewerFile, result.reviewPath);
-  let requests = 0;
-
-  await assertRejects(
-    () =>
-      postRuntime(result.manifestPath, context, () => {
-        requests++;
-        return Promise.resolve(new Response(null, { status: 200 }));
-      }),
-    Error,
-    "regular private file",
-  );
-
-  assertEquals(requests, 1);
-  assert(await missing(result.runtimeDir));
-});
-
-Deno.test("reports an attributed failure when a pull request review is missing", async () => {
-  const result = await fixture({ ok: true, body: "done" });
-  const bodies: unknown[] = [];
-
-  await assertRejects(
-    () =>
-      postRuntime(
-        result.manifestPath,
-        {
-          ...context,
-          eventName: "pull_request",
-        },
-        (_url, init) => {
-          bodies.push(JSON.parse(String(init?.body)));
-          return Promise.resolve(new Response(null, { status: 201 }));
-        },
-      ),
-    Error,
-    "did not write",
-  );
-
-  assertEquals(bodies, [
-    {
-      body: "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (failed)",
-    },
-  ]);
-  assert(await missing(result.runtimeDir));
-});
@@ -1,8 +1,13 @@
+import { appendFile, rm } from "node:fs/promises";
+import process from "node:process";
+
 import { prepareRuntime } from "./runtime.ts";

 const env = (name: string): string => {
-  const value = Deno.env.get(name);
-  if (!value) throw new Error(`${name} is not set`);
+  const value = process.env[name];
+  if (value === undefined || value === "") {
+    throw new Error(`${name} is not set`);
+  }
  return value;
 };

@@ -12,10 +17,8 @@ const manifest = await prepareRuntime(
  env("BOT_AGENTS_MASTER_KEY"),
 );
 try {
-  await Deno.writeTextFile(env("GITHUB_OUTPUT"), `manifest=${manifest.manifestPath}\n`, {
-    append: true,
-  });
+  await appendFile(env("GITHUB_OUTPUT"), `manifest=${manifest.manifestPath}\n`);
 } catch (error) {
-  await Deno.remove(manifest.runtimeDir, { recursive: true }).catch(() => undefined);
+  await rm(manifest.runtimeDir, { recursive: true }).catch(() => {});
  throw error;
 }
@@ -1,4 +1,4 @@
-import { assertEquals, assertRejects } from "jsr:@std/assert@1";
+import { expect, test } from "vite-plus/test";
 import {
  AgentAuthError,
  agentEnvironment,
@@ -9,14 +9,13 @@ import {
  sanitizedEnvironment,
 } from "./profiles.ts";

-Deno.test("formats profile attribution as a Markdown quote", () => {
-  assertEquals(
-    profileFooter({ type: "opencode", model: "openrouter/qwen/qwen3.8-27b" }),
+test("formats profile attribution as a Markdown quote", () => {
+  expect(profileFooter({ type: "opencode", model: "openrouter/qwen/qwen3.8-27b" })).toBe(
    "> Profile: `opencode` · `openrouter/qwen/qwen3.8-27b`",
  );
 });

-Deno.test("falls through only after usage exhaustion", async () => {
+test("falls through only after usage exhaustion", async () => {
  const visited: string[] = [];
  const result = await runProfiles(
    [
@@ -32,11 +31,11 @@ Deno.test("falls through only after usage exhaustion", async () => {
    },
  );

-  assertEquals(result, "done");
-  assertEquals(visited, ["claude", "codex"]);
+  expect(result).toBe("done");
+  expect(visited).toStrictEqual(["claude", "codex"]);
 });

-Deno.test("recognizes Claude's weekly limit message", async () => {
+test("recognizes Claude's weekly limit message", async () => {
  const result = await runProfiles(
    [
      { type: "claude", model: "claude-sonnet-5", token: "first" },
@@ -50,10 +49,10 @@ Deno.test("recognizes Claude's weekly limit message", async () => {
    },
  );

-  assertEquals(result, "fallback");
+  expect(result).toBe("fallback");
 });

-Deno.test("recognizes provider API exhaustion status", async () => {
+test("recognizes provider API exhaustion status", async () => {
  const results = await Promise.all(
    ["API Error: 402 Insufficient funds", "HTTP error: 429"].map((message) =>
      runProfiles(
@@ -69,10 +68,10 @@ Deno.test("recognizes provider API exhaustion status", async () => {
    ),
  );

-  assertEquals(results, ["fallback", "fallback"]);
+  expect(results).toStrictEqual(["fallback", "fallback"]);
 });

-Deno.test("falls through after a sign-in failure and records each try", async () => {
+test("falls through after a sign-in failure and records each try", async () => {
  const failures: ProfileFailure[] = [];
  const result = await runProfiles(
    [
@@ -90,22 +89,20 @@ Deno.test("falls through after a sign-in failure and records each try", async ()
    failures,
  );

-  assertEquals(result, "fallback");
-  assertEquals(failures, [
+  expect(result).toBe("fallback");
+  expect(failures).toStrictEqual([
    { type: "codex", model: "gpt-5.6-terra", reason: "sign-in failed" },
    { type: "claude", model: "claude-sonnet-5", reason: "usage exhausted" },
  ]);
-  assertEquals(
-    failureFooter(failures),
+  expect(failureFooter(failures)).toStrictEqual(
    "> Tried: `codex` · `gpt-5.6-terra` (sign-in failed), " +
      "`claude` · `claude-sonnet-5` (usage exhausted)",
  );
 });

-Deno.test("throws the last sign-in failure when every profile fails", async () => {
+test("throws the last sign-in failure when every profile fails", async () => {
  const failures: ProfileFailure[] = [];
-  await assertRejects(
-    () =>
+  await expect(() =>
    runProfiles(
      [
        { type: "codex", model: "gpt-5.6-terra" },
@@ -116,19 +113,17 @@ Deno.test("throws the last sign-in failure when every profile fails", async () =
      },
      failures,
    ),
-    AgentAuthError,
-    "claude sign-in failed",
-  );
-  assertEquals(
-    failures.map(({ reason }) => reason),
-    ["sign-in failed", "sign-in failed"],
+  ).rejects.toThrow(
+    expect.toSatisfy(
+      (e: unknown) => e instanceof AgentAuthError && e.message.includes("claude sign-in failed"),
+    ),
  );
+  expect(failures.map(({ reason }) => reason)).toStrictEqual(["sign-in failed", "sign-in failed"]);
 });

-Deno.test("preserves an ordinary agent failure", async () => {
+test("preserves an ordinary agent failure", async () => {
  const visited: string[] = [];
-  await assertRejects(
-    () =>
+  await expect(() =>
    runProfiles(
      [
        { type: "claude", model: "claude-sonnet-5", token: "first" },
@@ -139,16 +134,13 @@ Deno.test("preserves an ordinary agent failure", async () => {
        throw new Error("tests failed");
      },
    ),
-    Error,
-    "tests failed",
-  );
-  assertEquals(visited, ["claude"]);
+  ).rejects.toThrow("tests failed");
+  expect(visited).toStrictEqual(["claude"]);
 });

-Deno.test("does not mistake incidental quota text for exhaustion", async () => {
+test("does not mistake incidental quota text for exhaustion", async () => {
  const visited: string[] = [];
-  await assertRejects(
-    () =>
+  await expect(() =>
    runProfiles(
      [
        { type: "claude", model: "claude-sonnet-5", token: "first" },
@@ -159,13 +151,11 @@ Deno.test("does not mistake incidental quota text for exhaustion", async () => {
        throw new Error("quota parser test failed at line 429");
      },
    ),
-    Error,
-    "quota parser test failed",
-  );
-  assertEquals(visited, ["claude"]);
+  ).rejects.toThrow("quota parser test failed");
+  expect(visited).toStrictEqual(["claude"]);
 });

-Deno.test("exposes only the selected profile credential to the agent", () => {
+test("exposes only the selected profile credential to the agent", () => {
  const base = {
    PATH: "/usr/bin",
    HOME: "/home/bot",
@@ -190,18 +180,18 @@ Deno.test("exposes only the selected profile credential to the agent", () => {
    tokenFile: "/runtime/profile-0/token",
  };

-  assertEquals(agentEnvironment(base, profile, "selected"), {
+  expect(agentEnvironment(base, profile, "selected")).toStrictEqual({
    PATH: "/usr/bin",
    HOME: "/runtime/profile-0",
    CLAUDE_CODE_OAUTH_TOKEN: "selected",
  });
-  assertEquals(sanitizedEnvironment(base), {
+  expect(sanitizedEnvironment(base)).toStrictEqual({
    PATH: "/usr/bin",
    HOME: "/home/bot",
  });
 });

-Deno.test("uses a private Codex home without inventing an API credential", () => {
+test("uses a private Codex home without inventing an API credential", () => {
  const profile = {
    index: 1,
    type: "codex" as const,
@@ -212,14 +202,14 @@ Deno.test("uses a private Codex home without inventing an API credential", () =>
    tokenFile: null,
  };

-  assertEquals(agentEnvironment({ PATH: "/bin" }, profile), {
+  expect(agentEnvironment({ PATH: "/bin" }, profile)).toStrictEqual({
    PATH: "/bin",
    HOME: "/runtime/profile-1",
    CODEX_HOME: "/runtime/profile-1/.codex",
  });
 });

-Deno.test("exposes an OpenRouter key only to the OpenCode profile", () => {
+test("exposes an OpenRouter key only to the OpenCode profile", () => {
  const profile = {
    index: 2,
    type: "opencode" as const,
@@ -230,7 +220,7 @@ Deno.test("exposes an OpenRouter key only to the OpenCode profile", () => {
    tokenFile: "/runtime/profile-2/token",
  };

-  assertEquals(agentEnvironment({ PATH: "/bin" }, profile, "selected"), {
+  expect(agentEnvironment({ PATH: "/bin" }, profile, "selected")).toStrictEqual({
    PATH: "/bin",
    HOME: "/runtime/profile-2",
    OPENROUTER_API_KEY: "selected",
@@ -1,8 +1,17 @@
-export type BotProfile = {
-  type: "claude" | "codex" | "opencode";
+export type ProfileType = "claude" | "codex" | "opencode";
+
+export interface BotProfile {
+  type: ProfileType;
  model: string;
  token?: string;
-};
+}
+
+const PROFILE_TYPES: Set<unknown> = new Set(["claude", "codex", "opencode"]);
+const FAILURE_REASONS: Set<unknown> = new Set(["sign-in failed", "usage exhausted", "failed"]);
+
+export function isProfileType(value: unknown): value is ProfileType {
+  return PROFILE_TYPES.has(value);
+}

 export function profileFooter(profile: Pick<BotProfile, "type" | "model">): string {
  return `> Profile: \`${profile.type}\` · \`${profile.model}\``;
@@ -14,6 +23,10 @@ export function withProfile(body: string, profile: Pick<BotProfile, "type" | "mo

 export type FailureReason = "sign-in failed" | "usage exhausted" | "failed";

+export function isFailureReason(value: unknown): value is FailureReason {
+  return FAILURE_REASONS.has(value);
+}
+
 export type ProfileFailure = Pick<BotProfile, "type" | "model"> & {
  reason: FailureReason;
 };
@@ -22,7 +35,7 @@ export type ProfileFailure = Pick<BotProfile, "type" | "model"> & {
 export class AgentAuthError extends Error {}

 function isUsageExhausted(error: unknown): boolean {
-  return /(?:usage|rate) limit|hit your (?:weekly )?limit|insufficient_quota|exceeded your current quota|too many requests|(?:api error|http error|http|status(?: code)?)[ :]+4(?:02|29)\b/i.test(
+  return /(?:usage|rate) limit|hit your (?:weekly )?limit|insufficient_quota|exceeded your current quota|too many requests|(?:api error|http error|http|status(?: code)?)[ :]+4(?:02|29)\b/iu.test(
    String(error),
  );
 }
@@ -39,12 +52,18 @@ export function failureFooter(failures: ProfileFailure[]): string {
    .join(", ")}`;
 }

-export async function runProfiles<T, P extends Pick<BotProfile, "type" | "model">>(
+// Tries the profiles from `index` on, moving on only after a sign-in failure
+// or exhausted usage, and records every profile it tried.
+async function attemptFrom<T, P extends Pick<BotProfile, "type" | "model">>(
  profiles: P[],
  attempt: (profile: P) => Promise<T>,
-  failures: ProfileFailure[] = [],
+  failures: ProfileFailure[],
+  index: number,
 ): Promise<T> {
-  for (const [index, profile] of profiles.entries()) {
+  const profile = profiles[index];
+  if (profile === undefined) {
+    throw new Error("profiles must contain at least one profile");
+  }
  try {
    return await attempt(profile);
  } catch (error) {
@@ -52,9 +71,16 @@ export async function runProfiles<T, P extends Pick<BotProfile, "type" | "model"
    failures.push({ type: profile.type, model: profile.model, reason });
    if (reason === "failed" || index === profiles.length - 1) throw error;
    console.error(`${profile.type} ${reason}; trying next profile`);
+    return attemptFrom(profiles, attempt, failures, index + 1);
  }
-  }
-  throw new Error("profiles must contain at least one profile");
+}
+
+export function runProfiles<T, P extends Pick<BotProfile, "type" | "model">>(
+  profiles: P[],
+  attempt: (profile: P) => Promise<T>,
+  failures: ProfileFailure[] = [],
+): Promise<T> {
+  return attemptFrom(profiles, attempt, failures, 0);
 }

 export function sanitizedEnvironment(environment: Record<string, string>): Record<string, string> {
@@ -85,7 +111,8 @@ export function sanitizedEnvironment(environment: Record<string, string>): Recor
    "SSL_CERT_DIR",
    "NODE_EXTRA_CA_CERTS",
  ]) {
-    if (environment[name] !== undefined) result[name] = environment[name];
+    const value = environment[name];
+    if (value !== undefined) result[name] = value;
  }
  return result;
 }
@@ -98,7 +125,7 @@ export function agentEnvironment(
  const result = sanitizedEnvironment(environment);
  result.HOME = profile.home;
  if (profile.type === "codex") result.CODEX_HOME = `${profile.home}/.codex`;
-  if (token) {
+  if (token !== undefined && token !== "") {
    const tokenName = {
      claude: "CLAUDE_CODE_OAUTH_TOKEN",
      codex: "OPENAI_API_KEY",
@@ -0,0 +1,79 @@
+// The agent phase's environment and the helpers every agent runner shares. It
+// is read once, when the runner starts, as the single-file runner did.
+import { chmod, chown, writeFile } from "node:fs/promises";
+import process from "node:process";
+
+import { agentCommand } from "./isolation.ts";
+import { agentEnvironment, sanitizedEnvironment } from "./profiles.ts";
+import { readRuntimeManifest } from "./runtime.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+
+export const env = (name: string): string => {
+  const value = process.env[name];
+  if (value === undefined) {
+    throw new Error(`${name} is not set`);
+  }
+  return value;
+};
+
+function definedEnvironment(): Record<string, string> {
+  const result: Record<string, string> = {};
+  for (const [name, value] of Object.entries(process.env)) {
+    if (value !== undefined) {
+      result[name] = value;
+    }
+  }
+  return result;
+}
+
+export const API = env("GITEA_API_URL");
+export const REPO = env("GITEA_REPOSITORY");
+export const INDEX = env("ISSUE_INDEX");
+export const EVENT = env("EVENT_NAME");
+const AUTHOR_TOKEN = env("GITEA_TOKEN");
+export const WORKSPACE = env("GITHUB_WORKSPACE");
+export const MANIFEST = await readRuntimeManifest(env("BOT_AGENTS_MANIFEST"));
+export const PROCESS_ENV = sanitizedEnvironment(definedEnvironment());
+
+export async function gitea(path: string, body?: unknown): Promise<Response> {
+  const response = await fetch(`${API}/${path}`, {
+    method: body === undefined ? "GET" : "POST",
+    headers: {
+      Authorization: `token ${AUTHOR_TOKEN}`,
+      "Content-Type": "application/json",
+    },
+    body: body === undefined ? null : JSON.stringify(body),
+  });
+  if (!response.ok) {
+    throw new Error(`${path}: ${response.status} ${await response.text()}`);
+  }
+  return response;
+}
+
+export async function postAuthorComment(body: string): Promise<void> {
+  await gitea(`repos/${REPO}/issues/${INDEX}/comments`, { body });
+}
+
+export async function runAgentCommand(
+  profile: RuntimeProfile,
+  command: string,
+  args: string[],
+  token?: string,
+): Promise<void> {
+  const { success, code } = await agentCommand(profile, command, args, {
+    cwd: WORKSPACE,
+    env: agentEnvironment(PROCESS_ENV, profile, token),
+    clearEnv: true,
+  }).output();
+  if (!success) {
+    throw new Error(`${command} ${args[0]} exited with ${code}`);
+  }
+}
+
+export async function makeProfileFile(profile: RuntimeProfile, name: string): Promise<string> {
+  const path = `${profile.home}/${name}`;
+  await writeFile(path, "", { mode: 0o600 });
+  await chmod(path, 0o600);
+  await chown(path, profile.uid, profile.gid);
+  return path;
+}
@@ -1,113 +1,66 @@
 // Runs one ordered agent profile. Credential decryption and reviewer posting
 // live in separate processes so neither privileged secret reaches this runner.
-import { TextLineStream } from "jsr:@std/streams@1/text-line-stream";
-import {
-  type CodexAuthentication,
-  codexAuthentication,
-  isClaudeAuthFailure,
-  isCodexAuthFailure,
-  persistCodexAuth,
-  retryInvalidToken,
-  stageCodexAuth,
-} from "./auth.ts";
-import { agentCommand, killProfileProcesses, readProfileFile } from "./isolation.ts";
-import {
-  AgentAuthError,
-  agentEnvironment,
-  type ProfileFailure,
-  runProfiles,
-  sanitizedEnvironment,
-  withProfile,
-} from "./profiles.ts";
-import {
-  collectOpenCodeOutput,
-  openCodeArgs,
-  openCodeError,
-  parseOpenCodeEvents,
-} from "./opencode.ts";
-import { readRuntimeManifest, type RuntimeOutcome, type RuntimeProfile } from "./runtime.ts";
+import { chmod, readFile, writeFile } from "node:fs/promises";

-type GiteaUser = { login: string; email: string };
-type GiteaComment = { user: GiteaUser; created_at: string; body: string };
-type AttemptResult = {
+import { codexAuthentication, persistCodexAuth, stageCodexAuth } from "./auth.ts";
+import { runAgent } from "./agents.ts";
+import type { AgentAnswer } from "./agents.ts";
+import { output } from "./command.ts";
+import { killProfileProcesses, readProfileFile } from "./isolation.ts";
+import { isObject } from "./json.ts";
+import { runProfiles } from "./profiles.ts";
+import type { ProfileFailure } from "./profiles.ts";
+import {
+  API,
+  env,
+  EVENT,
+  gitea,
+  INDEX,
+  makeProfileFile,
+  MANIFEST,
+  PROCESS_ENV,
+  REPO,
+  runAgentCommand,
+  WORKSPACE,
+} from "./run-context.ts";
+import type { RuntimeOutcome, RuntimeProfile } from "./runtime.ts";
+
+interface AttemptResult {
  body: string;
  reviewPath: string;
  anchorsPath: string;
  profile: Pick<RuntimeProfile, "type" | "model">;
-};
+}

-const env = (name: string): string => {
-  const value = Deno.env.get(name);
-  if (value === undefined) throw new Error(`${name} is not set`);
-  return value;
-};
+interface RenderedPrompt {
+  prompt: string;
+  reviewPath: string;
+  anchorsPath: string;
+}

-const API = env("GITEA_API_URL");
-const REPO = env("GITEA_REPOSITORY");
-const INDEX = env("ISSUE_INDEX");
-const EVENT = env("EVENT_NAME");
-const AUTHOR_TOKEN = env("GITEA_TOKEN");
-const WORKSPACE = env("GITHUB_WORKSPACE");
-const MANIFEST = await readRuntimeManifest(env("BOT_AGENTS_MANIFEST"));
-const PROCESS_ENV = sanitizedEnvironment(Deno.env.toObject());
 const RULES_PATH = "repos/commons/code-rules/raw/README.md";
 const CODEX_AUTH = "/root/.codex/auth.json";
 const SKILLS_INSTALL = "skills add obra/superpowers";

-async function gitea(path: string, body?: unknown): Promise<Response> {
-  const response = await fetch(`${API}/${path}`, {
-    method: body === undefined ? "GET" : "POST",
-    headers: {
-      Authorization: `token ${AUTHOR_TOKEN}`,
-      "Content-Type": "application/json",
-    },
-    body: body === undefined ? undefined : JSON.stringify(body),
-  });
-  if (!response.ok) {
-    throw new Error(`${path}: ${response.status} ${await response.text()}`);
-  }
-  return response;
-}
-
-async function postAuthorComment(body: string): Promise<void> {
-  await gitea(`repos/${REPO}/issues/${INDEX}/comments`, { body });
-}
-
 async function runRoot(command: string, args: string[]): Promise<void> {
-  const { success, code } = await new Deno.Command(command, {
-    args,
-    env: PROCESS_ENV,
-    clearEnv: true,
-  }).output();
-  if (!success) throw new Error(`${command} ${args[0]} exited with ${code}`);
+  const { success, code } = await output(command, { args, env: PROCESS_ENV, clearEnv: true });
+  if (!success) {
+    throw new Error(`${command} ${args[0]} exited with ${code}`);
+  }
 }

 async function configureGitAuthor(): Promise<void> {
-  const user: GiteaUser = await (await gitea("user")).json();
-  for (const [key, value] of [
-    ["name", user.login],
-    ["email", user.email],
-  ]) {
-    await runRoot("git", ["config", `user.${key}`, value]);
+  const user: unknown = await (await gitea("user")).json();
+  if (!isObject(user) || typeof user.login !== "string" || typeof user.email !== "string") {
+    throw new Error("user: unexpected Gitea response");
  }
+  await runRoot("git", ["config", "user.name", user.login]);
+  await runRoot("git", ["config", "user.email", user.email]);
 }

 async function readProfileToken(profile: RuntimeProfile): Promise<string | undefined> {
-  return profile.tokenFile === null ? undefined : await Deno.readTextFile(profile.tokenFile);
-}
-
-async function runAgentCommand(
-  profile: RuntimeProfile,
-  command: string,
-  args: string[],
-  token?: string,
-): Promise<void> {
-  const { success, code } = await agentCommand(profile, command, args, {
-    cwd: WORKSPACE,
-    env: agentEnvironment(PROCESS_ENV, profile, token),
-    clearEnv: true,
-  }).output();
-  if (!success) throw new Error(`${command} ${args[0]} exited with ${code}`);
+  const token = profile.tokenFile === null ? undefined : await readFile(profile.tokenFile, "utf8");
+  return token;
 }

 async function prepareProfile(profile: RuntimeProfile): Promise<void> {
@@ -128,19 +81,26 @@ async function prepareProfile(profile: RuntimeProfile): Promise<void> {
  ]);
 }

-async function renderPrompt(
-  profile: RuntimeProfile,
-): Promise<{ prompt: string; reviewPath: string; anchorsPath: string }> {
-  const reviewPath = await makeProfileFile(profile, "review.md");
-  const anchorsPath = await makeProfileFile(profile, "anchors.json");
-  const comments: GiteaComment[] = await (
+// One issue comment as the prompt quotes it.
+function formatComment(comment: unknown): string {
+  const { user, created_at: createdAt, body } = isObject(comment) ? comment : {};
+  const login = isObject(user) ? user.login : undefined;
+  return `## ${String(login)} at ${String(createdAt)}\n\n${String(body)}\n`;
+}
+
+async function promptValues(
+  reviewPath: string,
+  anchorsPath: string,
+): Promise<Record<string, string>> {
+  const comments: unknown = await (
    await gitea(`repos/${REPO}/issues/${INDEX}/comments?limit=100`)
  ).json();
-  const values: Record<string, string> = {
+  if (!Array.isArray(comments)) {
+    throw new TypeError("comments: unexpected Gitea response");
+  }
+  return {
    COMMENT: env("COMMENT"),
-    ISSUE_COMMENTS: comments
-      .map((comment) => `## ${comment.user.login} at ${comment.created_at}\n\n${comment.body}\n`)
-      .join("\n"),
+    ISSUE_COMMENTS: comments.map((comment: unknown) => formatComment(comment)).join("\n"),
    CODE_RULES: await (await gitea(RULES_PATH)).text(),
    EVENT_NAME: EVENT,
    GITEA_API_URL: API,
@@ -149,302 +109,62 @@ async function renderPrompt(
    REVIEW_PATH: reviewPath,
    ANCHORS_PATH: anchorsPath,
  };
-  const template = await Deno.readTextFile(new URL("../prompt.md", import.meta.url));
+}
+
+async function renderPrompt(profile: RuntimeProfile): Promise<RenderedPrompt> {
+  const reviewPath = await makeProfileFile(profile, "review.md");
+  const anchorsPath = await makeProfileFile(profile, "anchors.json");
+  const values = await promptValues(reviewPath, anchorsPath);
+  const template = await readFile(new URL("../prompt.md", import.meta.url), "utf8");
  return {
-    prompt: template.replace(/\$\{(\w+)\}/g, (match, name) => values[name] ?? match),
+    prompt: template.replaceAll(
+      /\$\{(\w+)\}/gu,
+      (match: string, name: string) => values[name] ?? match,
+    ),
    reviewPath,
    anchorsPath,
  };
 }

-async function runClaude(profile: RuntimeProfile, token: string, prompt: string): Promise<string> {
-  const claude = agentCommand(
-    profile,
-    "claude",
-    [
-      "--print",
-      "--dangerously-skip-permissions",
-      "--model",
-      profile.model,
-      "--output-format",
-      "stream-json",
-      "--verbose",
-      prompt,
-    ],
-    {
-      cwd: WORKSPACE,
-      env: {
-        ...agentEnvironment(PROCESS_ENV, profile, token),
-        IS_SANDBOX: "1",
-      },
-      clearEnv: true,
-      stdout: "piped",
-      stderr: "piped",
-    },
-  ).spawn();
-  let result:
-    | {
-        is_error?: boolean;
-        result?: string;
-        subtype: string;
-        api_error_status?: number | null;
-      }
-    | undefined;
-  let error = "";
-  const copyError = claude.stderr.pipeThrough(new TextDecoderStream()).pipeTo(
-    new WritableStream({
-      write(chunk) {
-        error += chunk;
-        console.error(chunk);
-      },
-    }),
-  );
-  const lines = claude.stdout
-    .pipeThrough(new TextDecoderStream())
-    .pipeThrough(new TextLineStream());
-  for await (const line of lines) {
-    if (!line) continue;
-    const event = JSON.parse(line);
-    for (const part of event.message?.content ?? []) {
-      const text = part.thinking ?? part.text ?? part.name;
-      if (text) console.log(text);
-    }
-    if (event.type === "result") result = event;
-  }
-  const [status] = await Promise.all([claude.status, copyError]);
-  if (result?.is_error) {
-    const failure = new Error(result.result ?? `claude ended with ${result.subtype}`);
-    if (isClaudeAuthFailure(result)) {
-      throw new AgentAuthError("claude sign-in failed", { cause: failure });
-    }
-    throw failure;
-  }
-  if (result?.result === undefined) {
-    throw new Error(error.trim() || `claude ended with ${result?.subtype ?? "no result"}`);
-  }
-  if (!status.success) {
-    throw new Error(error.trim() || `claude exited with ${status.code}`);
-  }
-  return result.result;
-}
-
-async function codexDeviceLogin(
-  profile: RuntimeProfile,
-  environment: Record<string, string>,
-): Promise<void> {
-  const login = agentCommand(profile, "codex", ["login", "--device-auth"], {
-    cwd: WORKSPACE,
-    env: environment,
-    clearEnv: true,
-    stdout: "piped",
-    stderr: "piped",
-  }).spawn();
-  let shown = "";
-  const collect = (stream: ReadableStream<Uint8Array>): Promise<void> =>
-    stream
-      .pipeThrough(new TextDecoderStream())
-      .pipeTo(new WritableStream({ write: (chunk) => void (shown += chunk) }));
-  const drained = Promise.all([collect(login.stdout), collect(login.stderr)]);
-  const status = login.status;
-  await new Promise((resolve) => setTimeout(resolve, 3000));
-  while (shown.trim() === "") {
-    const exited = await Promise.race([
-      status.then(() => true),
-      new Promise<boolean>((resolve) => setTimeout(() => resolve(false), 100)),
-    ]);
-    if (exited) {
-      throw new AgentAuthError("AI bot login produced no instructions");
-    }
-  }
-  await postAuthorComment(withProfile(shown, profile));
-  const [result] = await Promise.all([status, drained]);
-  if (!result.success) {
-    throw new AgentAuthError(`codex login exited with ${result.code}`);
-  }
-}
-
-async function codexApiLogin(
-  profile: RuntimeProfile,
-  environment: Record<string, string>,
-  token: string,
-): Promise<void> {
-  const login = agentCommand(profile, "codex", ["login", "--with-api-key"], {
-    cwd: WORKSPACE,
-    env: environment,
-    clearEnv: true,
-    stdin: "piped",
-    stderr: "piped",
-  }).spawn();
-  const writer = login.stdin.getWriter();
-  await writer.write(new TextEncoder().encode(`${token}\n`));
-  await writer.close();
-  const [status, error] = await Promise.all([login.status, new Response(login.stderr).text()]);
-  if (!status.success) {
-    throw new Error(error.trim() || `codex login exited with ${status.code}`);
-  }
-}
-
-async function makeProfileFile(profile: RuntimeProfile, name: string): Promise<string> {
-  const path = `${profile.home}/${name}`;
-  await Deno.writeTextFile(path, "", { mode: 0o600 });
-  await Deno.chmod(path, 0o600);
-  await Deno.chown(path, profile.uid, profile.gid);
-  return path;
-}
-
-async function runCodex(
-  profile: RuntimeProfile,
-  prompt: string,
-  authentication: CodexAuthentication,
-): Promise<string> {
-  const token = authentication.kind === "api-key" ? authentication.token : undefined;
-  const environment = agentEnvironment(PROCESS_ENV, profile, token);
-  if (authentication.kind === "api-key") {
-    await codexApiLogin(profile, environment, authentication.token);
-  } else {
-    const loggedIn = await agentCommand(profile, "codex", ["login", "status"], {
-      cwd: WORKSPACE,
-      env: environment,
-      clearEnv: true,
-    }).output();
-    if (!loggedIn.success) await codexDeviceLogin(profile, environment);
-  }
-  const outputPath = await makeProfileFile(profile, "result.md");
-  const attempt = async () => {
-    const codex = agentCommand(
-      profile,
-      "codex",
-      [
-        "exec",
-        "--model",
-        profile.model,
-        "--dangerously-bypass-approvals-and-sandbox",
-        "--output-last-message",
-        outputPath,
-        prompt,
-      ],
-      {
-        cwd: WORKSPACE,
-        env: environment,
-        clearEnv: true,
-        stdout: "inherit",
-        stderr: "piped",
-      },
-    ).spawn();
-    const decoder = new TextDecoder();
-    let error = "";
-    for await (const chunk of codex.stderr) {
-      await Deno.stderr.write(chunk);
-      error += decoder.decode(chunk, { stream: true });
-    }
-    error += decoder.decode();
-    // Codex echoes the prompt, whose comments may quote auth errors.
-    return { status: await codex.status, error: error.replaceAll(prompt, "") };
-  };
-  const result =
-    authentication.kind === "api-key"
-      ? await attempt()
-      : await retryInvalidToken(attempt, async () => {
-          await runAgentCommand(profile, "codex", ["logout"]);
-          await codexDeviceLogin(profile, environment);
-        });
-  if (!result.status.success) {
-    const failure = new Error(result.error.trim() || `codex exited with ${result.status.code}`);
-    if (isCodexAuthFailure(result.error)) {
-      throw new AgentAuthError("codex sign-in failed", { cause: failure });
-    }
-    throw failure;
-  }
-  return outputPath;
-}
-
-async function runOpenCode(
-  profile: RuntimeProfile,
-  token: string,
-  prompt: string,
-): Promise<string> {
-  const process = agentCommand(profile, "opencode", openCodeArgs(profile.model, prompt), {
-    cwd: WORKSPACE,
-    env: agentEnvironment(PROCESS_ENV, profile, token),
-    clearEnv: true,
-    stdout: "piped",
-    stderr: "piped",
-  }).spawn();
-  const output = collectOpenCodeOutput(
-    process.stdout,
-    process.stderr,
-    async (chunk) => {
-      await Deno.stdout.write(chunk);
-    },
-    async (chunk) => {
-      await Deno.stderr.write(chunk);
-    },
-  );
-  const [status, streams] = await Promise.all([process.status, output]);
-  const error = streams.stderr.trim();
-  if (!status.success) {
-    throw (
-      openCodeError(streams.stdout) ?? new Error(error || `opencode exited with ${status.code}`)
-    );
-  }
-  return parseOpenCodeEvents(streams.stdout);
-}
-
 async function runProfile(profile: RuntimeProfile): Promise<AttemptResult> {
  const token = await readProfileToken(profile);
  const authentication = profile.type === "codex" ? codexAuthentication(token) : null;
  let stagedCodexAuth: string | null = null;
-  let body: string | undefined;
-  let resultPath: string | null = null;
-  let reviewPath: string | undefined;
-  let anchorsPath: string | undefined;
+  let answer: AgentAnswer = {};
+  let rendered: RenderedPrompt | undefined;
  try {
    if (authentication?.kind === "persistent") {
      stagedCodexAuth = await stageCodexAuth(CODEX_AUTH, profile.home, profile.uid, profile.gid);
    }
    await prepareProfile(profile);
-    const rendered = await renderPrompt(profile);
-    reviewPath = rendered.reviewPath;
-    anchorsPath = rendered.anchorsPath;
-    if (profile.type === "claude") {
-      body = await runClaude(profile, token ?? "", rendered.prompt);
-    } else if (profile.type === "codex") {
-      resultPath = await runCodex(profile, rendered.prompt, authentication!);
-    } else {
-      body = await runOpenCode(profile, token ?? "", rendered.prompt);
-    }
+    rendered = await renderPrompt(profile);
+    answer = await runAgent(profile, token, rendered.prompt, authentication);
  } finally {
    await killProfileProcesses(profile.uid);
    if (stagedCodexAuth !== null) {
      await persistCodexAuth(stagedCodexAuth, CODEX_AUTH);
    }
  }
-  if (resultPath !== null) body = await readProfileFile(profile, resultPath);
-  if (body === undefined || reviewPath === undefined || anchorsPath === undefined) {
+  const body =
+    answer.resultPath === undefined
+      ? answer.body
+      : await readProfileFile(profile, answer.resultPath);
+  if (body === undefined || rendered === undefined) {
    throw new Error("agent attempt produced no result");
  }
-  return {
-    body,
-    reviewPath,
-    anchorsPath,
-    profile: { type: profile.type, model: profile.model },
-  };
+  const { reviewPath, anchorsPath } = rendered;
+  return { body, reviewPath, anchorsPath, profile: { type: profile.type, model: profile.model } };
 }

 async function writeOutcome(outcome: RuntimeOutcome): Promise<void> {
-  await Deno.writeTextFile(MANIFEST.outcomeFile, JSON.stringify(outcome), {
-    mode: 0o600,
-  });
-  await Deno.chmod(MANIFEST.outcomeFile, 0o600);
+  await writeFile(MANIFEST.outcomeFile, JSON.stringify(outcome), { mode: 0o600 });
+  await chmod(MANIFEST.outcomeFile, 0o600);
 }

 const failures: ProfileFailure[] = [];
 try {
  await configureGitAuthor();
-  await writeOutcome({
-    ok: true,
-    ...(await runProfiles(MANIFEST.profiles, runProfile, failures)),
-  });
+  await writeOutcome({ ok: true, ...(await runProfiles(MANIFEST.profiles, runProfile, failures)) });
 } catch (error) {
  console.error(error);
  await writeOutcome({ ok: false, failures });
@@ -0,0 +1,105 @@
+import { chmod, readdir, readFile, rm, stat, writeFile } from "node:fs/promises";
+import process from "node:process";
+import { fileURLToPath } from "node:url";
+
+import { assert, expect, test } from "vite-plus/test";
+
+import { output } from "./command.ts";
+import { prepareRuntime } from "./runtime.ts";
+import type { RuntimeProfile } from "./runtime.ts";
+import { IS_ROOT, makeTempDir } from "./testing.ts";
+
+const MASTER_KEY = "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8";
+const ENCRYPTED = "v1:ICEiIyQlJicoKSor:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA";
+
+// Runs `command` as the profile's user, from the root directory.
+async function runAs(profile: RuntimeProfile, command: string, path: string): Promise<boolean> {
+  const result = await output(command, {
+    args: [path],
+    cwd: "/",
+    uid: profile.uid,
+    gid: profile.gid,
+  });
+  return result.success;
+}
+
+async function expectPrivate(path: string, uid: number, mode: number): Promise<void> {
+  const info = await stat(path);
+  expect(info.uid).toStrictEqual(uid);
+  expect(info.mode & 0o777).toBe(mode);
+}
+
+test.skipIf(!IS_ROOT)("prepares root-only reviewer and isolated profile credentials", async () => {
+  const root = await makeTempDir();
+  await chmod(root, 0o711);
+  const action = await makeTempDir();
+  try {
+    await writeFile(
+      `${action}/profiles.json`,
+      JSON.stringify({
+        "reviewer-token": ENCRYPTED,
+        profiles: [{ type: "claude", token: ENCRYPTED }, { type: "codex" }],
+      }),
+    );
+
+    const manifest = await prepareRuntime(action, root, MASTER_KEY);
+    const serialized = await readFile(manifest.manifestPath, "utf8");
+    assert(!serialized.includes("secret-token"));
+    expect(await readFile(manifest.reviewerFile, "utf8")).toBe("secret-token");
+    await expectPrivate(manifest.reviewerFile, 0, 0o600);
+
+    const [claude, codex] = manifest.profiles;
+    assert(claude !== undefined && codex !== undefined);
+    expect(claude.uid).not.toStrictEqual(codex.uid);
+    await expectPrivate(claude.home, claude.uid, 0o700);
+    assert(claude.tokenFile !== null);
+    expect(await readFile(claude.tokenFile, "utf8")).toBe("secret-token");
+    await expectPrivate(claude.tokenFile, claude.uid, 0o600);
+    expect((await stat(codex.home)).uid).toStrictEqual(codex.uid);
+    expect(codex.tokenFile).toBe(null);
+
+    const ownToken = await output("/bin/cat", {
+      args: [claude.tokenFile],
+      cwd: "/",
+      uid: claude.uid,
+      gid: claude.gid,
+    });
+    expect(ownToken.success).toBe(true);
+    expect(new TextDecoder().decode(ownToken.stdout)).toBe("secret-token");
+    expect(await runAs(claude, "/bin/cat", manifest.reviewerFile)).toBe(false);
+    expect(await runAs(claude, "/bin/ls", codex.home)).toBe(false);
+  } finally {
+    await rm(root, { recursive: true });
+    await rm(action, { recursive: true });
+  }
+});
+
+test.skipIf(!IS_ROOT)("removes prepared credentials when output publication fails", async () => {
+  const root = await makeTempDir();
+  const action = await makeTempDir();
+  try {
+    await writeFile(
+      `${action}/profiles.json`,
+      JSON.stringify({
+        "reviewer-token": ENCRYPTED,
+        profiles: [{ type: "claude", token: ENCRYPTED }],
+      }),
+    );
+    const result = await output(process.execPath, {
+      args: [fileURLToPath(new URL("prepare.ts", import.meta.url))],
+      env: {
+        ACTION_PATH: action,
+        RUNNER_TEMP: root,
+        BOT_AGENTS_MASTER_KEY: MASTER_KEY,
+        GITHUB_OUTPUT: action,
+      },
+      clearEnv: true,
+    });
+
+    expect(result.success).toBe(false);
+    expect(await readdir(root)).toStrictEqual([]);
+  } finally {
+    await rm(root, { recursive: true });
+    await rm(action, { recursive: true });
+  }
+});
@@ -1,5 +1,8 @@
-import { join } from "jsr:@std/path@1";
+import { chmod, chown, mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+
 import { parseCredentials } from "./credentials.ts";
+import { isMapping } from "./json.ts";
 import type { BotProfile, ProfileFailure } from "./profiles.ts";

 const FIRST_PROFILE_UID = 20_000;
@@ -12,13 +15,13 @@ export type RuntimeProfile = Pick<BotProfile, "type" | "model"> & {
  tokenFile: string | null;
 };

-export type RuntimeManifest = {
+export interface RuntimeManifest {
  runtimeDir: string;
  manifestPath: string;
  reviewerFile: string;
  outcomeFile: string;
  profiles: RuntimeProfile[];
-};
+}

 export type RuntimeOutcome =
  | {
@@ -31,9 +34,27 @@ export type RuntimeOutcome =
  | { ok: false; failures: ProfileFailure[] };

 async function writePrivate(path: string, value: string, uid: number, gid: number): Promise<void> {
-  await Deno.writeTextFile(path, value, { mode: 0o600 });
-  await Deno.chmod(path, 0o600);
-  await Deno.chown(path, uid, gid);
+  await writeFile(path, value, { mode: 0o600 });
+  await chmod(path, 0o600);
+  await chown(path, uid, gid);
+}
+
+async function prepareProfile(
+  runtimeDir: string,
+  profile: BotProfile,
+  index: number,
+): Promise<RuntimeProfile> {
+  const uid = FIRST_PROFILE_UID + index;
+  const home = join(runtimeDir, `profile-${index}`);
+  await mkdir(home, { mode: 0o700 });
+  await chmod(home, 0o700);
+  await chown(home, uid, uid);
+  const tokenFile =
+    profile.token === undefined || profile.token === "" ? null : join(home, "token");
+  if (tokenFile !== null && profile.token !== undefined) {
+    await writePrivate(tokenFile, profile.token, uid, uid);
+  }
+  return { index, type: profile.type, model: profile.model, uid, gid: uid, home, tokenFile };
 }

 export async function prepareRuntime(
@@ -42,39 +63,23 @@ export async function prepareRuntime(
  masterKey: string,
 ): Promise<RuntimeManifest> {
  const credentials = await parseCredentials(
-    await Deno.readTextFile(join(actionPath, "profiles.yml")),
+    await readFile(join(actionPath, "profiles.json"), "utf8"),
    masterKey,
  );
-  const runtimeDir = await Deno.makeTempDir({
-    dir: runtimeRoot,
-    prefix: "bot-agents-",
-  });
+  const runtimeDir = await mkdtemp(join(runtimeRoot, "bot-agents-"));
  try {
-    await Deno.chmod(runtimeDir, 0o711);
+    await chmod(runtimeDir, 0o711);
    const reviewerFile = join(runtimeDir, "reviewer-token");
    await writePrivate(reviewerFile, credentials.reviewerToken, 0, 0);

-    const profiles: RuntimeProfile[] = [];
-    for (const [index, profile] of credentials.profiles.entries()) {
-      const uid = FIRST_PROFILE_UID + index;
-      const home = join(runtimeDir, `profile-${index}`);
-      await Deno.mkdir(home, { mode: 0o700 });
-      await Deno.chmod(home, 0o700);
-      await Deno.chown(home, uid, uid);
-      const tokenFile = profile.token ? join(home, "token") : null;
-      if (tokenFile !== null) {
-        await writePrivate(tokenFile, profile.token!, uid, uid);
-      }
-      profiles.push({
-        index,
-        type: profile.type,
-        model: profile.model,
-        uid,
-        gid: uid,
-        home,
-        tokenFile,
-      });
-    }
+    // One profile at a time, in order, as each claims the next UID.
+    const profiles = await credentials.profiles.reduce<Promise<RuntimeProfile[]>>(
+      async (previous, profile, index) => [
+        ...(await previous),
+        await prepareProfile(runtimeDir, profile, index),
+      ],
+      Promise.resolve([]),
+    );

    const manifestPath = join(runtimeDir, "manifest.json");
    const manifest: RuntimeManifest = {
@@ -87,11 +92,26 @@ export async function prepareRuntime(
    await writePrivate(manifestPath, JSON.stringify(manifest), 0, 0);
    return manifest;
  } catch (error) {
-    await Deno.remove(runtimeDir, { recursive: true }).catch(() => undefined);
+    await rm(runtimeDir, { recursive: true }).catch(() => {});
    throw error;
  }
 }

-export async function readRuntimeManifest(path: string): Promise<RuntimeManifest> {
-  return JSON.parse(await Deno.readTextFile(path));
+function isRuntimeManifest(value: unknown): value is RuntimeManifest {
+  return (
+    isMapping(value) &&
+    typeof value.runtimeDir === "string" &&
+    typeof value.manifestPath === "string" &&
+    typeof value.reviewerFile === "string" &&
+    typeof value.outcomeFile === "string" &&
+    Array.isArray(value.profiles)
+  );
+}
+
+export async function readRuntimeManifest(path: string): Promise<RuntimeManifest> {
+  const value: unknown = JSON.parse(await readFile(path, "utf8"));
+  if (!isRuntimeManifest(value)) {
+    throw new Error(`${path}: invalid runtime manifest`);
+  }
+  return value;
 }
@@ -1,102 +0,0 @@
-import { assert, assertEquals, assertNotEquals } from "jsr:@std/assert@1";
-import { prepareRuntime } from "./runtime.ts";
-
-const MASTER_KEY = "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8";
-const ENCRYPTED = "v1:ICEiIyQlJicoKSor:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA";
-
-Deno.test({
-  name: "prepares root-only reviewer and isolated profile credentials",
-  permissions: { read: true, write: true, run: true, sys: ["uid"] },
-  async fn() {
-    if (Deno.uid() !== 0) return;
-    const root = await Deno.makeTempDir();
-    await Deno.chmod(root, 0o711);
-    const action = await Deno.makeTempDir();
-    try {
-      await Deno.writeTextFile(
-        `${action}/profiles.yml`,
-        `reviewer-token: ${ENCRYPTED}\nprofiles:\n  - type: claude\n    token: ${ENCRYPTED}\n  - type: codex\n`,
-      );
-
-      const manifest = await prepareRuntime(action, root, MASTER_KEY);
-      const serialized = await Deno.readTextFile(manifest.manifestPath);
-      assert(!serialized.includes("secret-token"));
-      assertEquals(await Deno.readTextFile(manifest.reviewerFile), "secret-token");
-      assertEquals((await Deno.stat(manifest.reviewerFile)).mode! & 0o777, 0o600);
-      assertEquals((await Deno.stat(manifest.reviewerFile)).uid, 0);
-
-      const [claude, codex] = manifest.profiles;
-      assertNotEquals(claude.uid, codex.uid);
-      assertEquals((await Deno.stat(claude.home)).uid, claude.uid);
-      assertEquals((await Deno.stat(claude.home)).mode! & 0o777, 0o700);
-      assert(claude.tokenFile !== null);
-      assertEquals(await Deno.readTextFile(claude.tokenFile), "secret-token");
-      assertEquals((await Deno.stat(claude.tokenFile)).uid, claude.uid);
-      assertEquals((await Deno.stat(claude.tokenFile)).mode! & 0o777, 0o600);
-      assertEquals((await Deno.stat(codex.home)).uid, codex.uid);
-      assertEquals(codex.tokenFile, null);
-
-      const ownToken = await new Deno.Command("/bin/cat", {
-        args: [claude.tokenFile],
-        cwd: "/",
-        uid: claude.uid,
-        gid: claude.gid,
-      }).output();
-      assertEquals(ownToken.success, true);
-      assertEquals(new TextDecoder().decode(ownToken.stdout), "secret-token");
-
-      const reviewerToken = await new Deno.Command("/bin/cat", {
-        args: [manifest.reviewerFile],
-        cwd: "/",
-        uid: claude.uid,
-        gid: claude.gid,
-      }).output();
-      assertEquals(reviewerToken.success, false);
-
-      const siblingHome = await new Deno.Command("/bin/ls", {
-        args: [codex.home],
-        cwd: "/",
-        uid: claude.uid,
-        gid: claude.gid,
-      }).output();
-      assertEquals(siblingHome.success, false);
-    } finally {
-      await Deno.remove(root, { recursive: true });
-      await Deno.remove(action, { recursive: true });
-    }
-  },
-});
-
-Deno.test({
-  name: "removes prepared credentials when output publication fails",
-  permissions: "inherit",
-  async fn() {
-    if (Deno.uid() !== 0) return;
-    const root = await Deno.makeTempDir();
-    const action = await Deno.makeTempDir();
-    try {
-      await Deno.writeTextFile(
-        `${action}/profiles.yml`,
-        `reviewer-token: ${ENCRYPTED}\nprofiles:\n  - type: claude\n    token: ${ENCRYPTED}\n`,
-      );
-      const result = await new Deno.Command(Deno.execPath(), {
-        args: ["run", "-A", new URL("./prepare.ts", import.meta.url).pathname],
-        env: {
-          ACTION_PATH: action,
-          RUNNER_TEMP: root,
-          BOT_AGENTS_MASTER_KEY: MASTER_KEY,
-          GITHUB_OUTPUT: action,
-        },
-        clearEnv: true,
-      }).output();
-
-      assertEquals(result.success, false);
-      const entries = [];
-      for await (const entry of Deno.readDir(root)) entries.push(entry.name);
-      assertEquals(entries, []);
-    } finally {
-      await Deno.remove(root, { recursive: true });
-      await Deno.remove(action, { recursive: true });
-    }
-  },
-});
@@ -0,0 +1,23 @@
+// Test support: the current user's IDs and a fresh temporary directory.
+import { mkdtemp } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import process from "node:process";
+
+export function currentUid(): number {
+  return process.getuid?.() ?? -1;
+}
+
+export function currentGid(): number {
+  return process.getgid?.() ?? -1;
+}
+
+// The isolation tests switch UIDs, which only root may do.
+export const IS_ROOT: boolean = currentUid() === 0;
+
+// Symlinks and POSIX modes, as these tests use them, need a Unix host.
+export const IS_WINDOWS: boolean = process.platform === "win32";
+
+export function makeTempDir(): Promise<string> {
+  return mkdtemp(join(tmpdir(), "bot-agents-test-"));
+}
@@ -1,174 +0,0 @@
-import { assert, assertEquals } from "jsr:@std/assert@1";
-import { parse } from "jsr:@std/yaml@1";
-
-type Mapping = Record<string, unknown>;
-
-const mapping = (value: unknown, at: string): Mapping => {
-  assert(typeof value === "object" && value !== null && !Array.isArray(value), at);
-  return value as Mapping;
-};
-
-const sequence = (value: unknown, at: string): Mapping[] => {
-  assert(Array.isArray(value), at);
-  return value.map((entry, index) => mapping(entry, `${at}[${index}]`));
-};
-
-async function yaml(path: string): Promise<Mapping> {
-  return mapping(parse(await Deno.readTextFile(path)), path);
-}
-
-async function yamlFiles(directory = "."): Promise<string[]> {
-  const result: string[] = [];
-  for await (const entry of Deno.readDir(directory)) {
-    if (entry.name === ".git" || entry.name === ".superpowers") continue;
-    const path = directory === "." ? entry.name : `${directory}/${entry.name}`;
-    if (entry.isDirectory) result.push(...(await yamlFiles(path)));
-    if (entry.isFile && /\.ya?ml$/.test(entry.name)) result.push(path);
-  }
-  return result;
-}
-
-Deno.test("all committed YAML parses", async () => {
-  const files = await yamlFiles();
-  assert(files.length > 0);
-  for (const file of files) await yaml(file);
-});
-
-Deno.test("the action exposes only the master key and scopes it to preparation", async () => {
-  const action = await yaml("action.yml");
-  assertEquals(Object.keys(mapping(action.inputs, "inputs")), ["master-key"]);
-  const steps = sequence(mapping(action.runs, "runs").steps, "runs.steps");
-  for (const step of steps) {
-    if (typeof step.run === "string") {
-      assertEquals(step.run.includes("\n"), false, String(step.name));
-    }
-  }
-  const checkout = steps.find((step) => step.uses === "actions/checkout@v4");
-  const prepare = steps.find((step) => step.id === "prepare");
-  const agent = steps.find((step) => step.id === "agent");
-  const post = steps.find((step) => step.id === "post");
-  const source = steps.find((step) => step.id === "source");
-  assert(checkout && source && prepare && agent && post);
-  assertEquals(mapping(checkout.with, "checkout.with").token, "${{ gitea.token }}");
-  assertEquals(
-    mapping(prepare.env, "prepare.env").BOT_AGENTS_MASTER_KEY,
-    "${{ inputs.master-key }}",
-  );
-  assertEquals(JSON.stringify(agent).includes("BOT_AGENTS_MASTER_KEY"), false);
-  assertEquals(JSON.stringify(post).includes("BOT_AGENTS_MASTER_KEY"), false);
-  assertEquals(mapping(agent.env, "agent.env").GITEA_TOKEN, "${{ gitea.token }}");
-  assert(String(post.if).includes("always()"));
-  for (const step of [prepare, agent, post]) {
-    assert(String(step.run).includes("steps.source.outputs.path"));
-  }
-});
-
-Deno.test("the source protection script stages immutable action files", async () => {
-  const temp = await Deno.makeTempDir();
-  const outputFile = `${temp}/output`;
-  try {
-    const output = await new Deno.Command("/bin/bash", {
-      args: ["scripts/protect-source.sh"],
-      env: {
-        ACTION_PATH: Deno.cwd(),
-        GITHUB_OUTPUT: outputFile,
-        RUNNER_TEMP: temp,
-      },
-      stderr: "piped",
-    }).output();
-    assert(output.success, new TextDecoder().decode(output.stderr));
-
-    const path = (await Deno.readTextFile(outputFile)).trim().slice(5);
-    for (const file of [
-      "src/prepare.ts",
-      "src/run.ts",
-      "src/post.ts",
-      "profiles.yml",
-      "prompt.md",
-    ]) {
-      const stat = await Deno.stat(`${path}/${file}`);
-      assert(stat.isFile, file);
-      assertEquals(stat.mode! & 0o022, 0, file);
-    }
-  } finally {
-    await Deno.remove(temp, { recursive: true });
-  }
-});
-
-Deno.test("module-relative runtime assets exist", async () => {
-  const module = new URL("run.ts", import.meta.url);
-  const source = await Deno.readTextFile(module);
-  for (const match of source.matchAll(/new URL\("([^"]+)", import\.meta\.url\)/g)) {
-    const asset = new URL(match[1], module);
-    const stat = await Deno.stat(asset);
-    assert(stat.isFile, asset.pathname);
-  }
-});
-
-Deno.test("the repository uses its trusted main action", async () => {
-  const workflow = await yaml(".gitea/workflows/agents.yml");
-  const job = mapping(mapping(workflow.jobs, "jobs").agent, "jobs.agent");
-  const permissions = mapping(job.permissions, "jobs.agent.permissions");
-  assertEquals(permissions, {
-    code: "write",
-    issues: "write",
-    "pull-requests": "write",
-  });
-  const steps = sequence(job.steps, "jobs.agent.steps");
-  const local = steps.findIndex((step) => step.uses === "./");
-  assertEquals(local, -1);
-  const trusted = steps.findIndex(
-    (step) => step.uses === "https://git.capsulizers.com/commons/bot-agents@main",
-  );
-  assert(trusted >= 0);
-  assertEquals(
-    mapping(steps[trusted].with, "trusted.with")["master-key"],
-    "${{ secrets.BOT_AGENTS_MASTER_KEY }}",
-  );
-  assertEquals(JSON.stringify(workflow).includes("gitea.actor != 'bot'"), true);
-});
-
-Deno.test("CI checks every phase and the root isolation suite", async () => {
-  const workflow = await yaml(".gitea/workflows/check.yml");
-  const job = mapping(mapping(workflow.jobs, "jobs").deno, "jobs.deno");
-  const commands = sequence(job.steps, "jobs.deno.steps")
-    .map((step) => (typeof step.run === "string" ? step.run : ""))
-    .join("\n");
-  for (const entrypoint of ["src/prepare.ts", "src/run.ts", "src/post.ts"]) {
-    assert(commands.includes(entrypoint), entrypoint);
-  }
-  assert(commands.includes("deno test --allow-all"));
-});
-
-Deno.test("uses the standard Skills installer without custom discovery", async () => {
-  const runner = await Deno.readTextFile("src/run.ts");
-  assert(runner.includes("skills add obra/superpowers"));
-  try {
-    await Deno.stat("superpowers.ts");
-    assert(false, "superpowers.ts should be removed");
-  } catch (error) {
-    assert(error instanceof Deno.errors.NotFound);
-  }
-});
-
-Deno.test("installs the OpenCode CLI", async () => {
-  const action = await Deno.readTextFile("action.yml");
-  assert(action.includes("opencode-ai"));
-});
-
-Deno.test("profile preparation does not receive provider credentials", async () => {
-  const runner = await Deno.readTextFile("src/run.ts");
-  assert(runner.includes("await prepareProfile(profile);"));
-  assertEquals(runner.includes("prepareProfile(profile, token)"), false);
-});
-
-Deno.test("central profiles fall back from Codex to Claude to OpenCode", async () => {
-  const credentials = await yaml("profiles.yml");
-  const profiles = sequence(credentials.profiles, "profiles");
-  assertEquals(
-    profiles.map((profile) => profile.type),
-    ["codex", "claude", "opencode"],
-  );
-  assertEquals(profiles[2].model, "openrouter/qwen/qwen3.8-27b");
-  assert(String(profiles[2].token).startsWith("v1:"));
-});
@@ -0,0 +1,27 @@
+import process from "node:process";
+import { fileURLToPath } from "node:url";
+
+import { expect, test } from "vite-plus/test";
+
+import { output } from "../src/command.ts";
+
+// Each phase runs as `node src/<phase>.ts` with no build step. Node loads the
+// whole import graph, stripping types, before the phase reads its first
+// variable, so failing on that variable proves every module loads.
+const PHASES: [phase: string, firstVariable: string][] = [
+  ["prepare", "ACTION_PATH"],
+  ["run", "GITEA_API_URL"],
+  ["post", "BOT_AGENTS_MANIFEST"],
+];
+
+test.each(PHASES)("Node loads the %s phase", async (phase, firstVariable) => {
+  const path = fileURLToPath(new URL(`../src/${phase}.ts`, import.meta.url));
+  const result = await output(process.execPath, {
+    args: [path],
+    env: { PATH: process.env.PATH ?? "" },
+    clearEnv: true,
+    stdin: "null",
+  });
+  expect(result.success).toBe(false);
+  expect(new TextDecoder().decode(result.stderr)).toContain(`${firstVariable} is not set`);
+});
@@ -0,0 +1,175 @@
+import { readdir, readFile, rm, stat } from "node:fs/promises";
+import process from "node:process";
+
+import { assert, expect, test } from "vite-plus/test";
+import { parse } from "yaml";
+
+import { output } from "../src/command.ts";
+import { isNotFound } from "../src/errors.ts";
+import { isMapping } from "../src/json.ts";
+import type { JsonObject } from "../src/json.ts";
+import { makeTempDir } from "../src/testing.ts";
+
+const mapping = (value: unknown, at: string): JsonObject => {
+  assert(isMapping(value), at);
+  return value;
+};
+
+const sequence = (value: unknown, at: string): JsonObject[] => {
+  assert(Array.isArray(value), at);
+  return value.map((entry: unknown, index) => mapping(entry, `${at}[${index}]`));
+};
+
+async function yaml(path: string): Promise<JsonObject> {
+  const value: unknown = parse(await readFile(path, "utf8"));
+  return mapping(value, path);
+}
+
+async function yamlFiles(): Promise<string[]> {
+  const entries = await readdir(".", { recursive: true, withFileTypes: true });
+  return entries
+    .filter((entry) => entry.isFile() && /\.ya?ml$/u.test(entry.name))
+    .map((entry) => `${entry.parentPath}/${entry.name}`.replace(/^\.\//u, ""))
+    .filter((path) => !/^(?:\.git|\.superpowers|node_modules)\//u.test(path));
+}
+
+const findStep = (steps: JsonObject[], key: string, value: string): JsonObject => {
+  const step = steps.find((entry) => entry[key] === value);
+  assert(step !== undefined, `${key}: ${value}`);
+  return step;
+};
+
+test("all committed YAML parses", async () => {
+  const files = await yamlFiles();
+  assert(files.length > 0);
+  await Promise.all(files.map((file) => yaml(file)));
+});
+
+test("the action exposes only the master key and scopes it to preparation", async () => {
+  const action = await yaml("action.yml");
+  expect(Object.keys(mapping(action.inputs, "inputs"))).toStrictEqual(["master-key"]);
+  const steps = sequence(mapping(action.runs, "runs").steps, "runs.steps");
+  for (const step of steps) {
+    if (typeof step.run === "string") {
+      expect(step.run.includes("\n"), String(step.name)).toBe(false);
+    }
+  }
+  const checkout = findStep(steps, "uses", "actions/checkout@v4");
+  const prepare = findStep(steps, "id", "prepare");
+  const agent = findStep(steps, "id", "agent");
+  const post = findStep(steps, "id", "post");
+  findStep(steps, "id", "source");
+  expect(mapping(checkout.with, "checkout.with").token).toBe("${{ gitea.token }}");
+  expect(mapping(prepare.env, "prepare.env").BOT_AGENTS_MASTER_KEY).toBe(
+    "${{ inputs.master-key }}",
+  );
+  expect(JSON.stringify(agent).includes("BOT_AGENTS_MASTER_KEY")).toBe(false);
+  expect(JSON.stringify(post).includes("BOT_AGENTS_MASTER_KEY")).toBe(false);
+  expect(mapping(agent.env, "agent.env").GITEA_TOKEN).toBe("${{ gitea.token }}");
+  assert(String(post.if).includes("always()"));
+  for (const step of [prepare, agent, post]) {
+    assert(String(step.run).includes("steps.source.outputs.path"));
+  }
+});
+
+test("the source protection script stages immutable action files", async () => {
+  const temp = await makeTempDir();
+  const outputFile = `${temp}/output`;
+  try {
+    const result = await output("/bin/bash", {
+      args: ["scripts/protect-source.sh"],
+      env: { ACTION_PATH: process.cwd(), GITHUB_OUTPUT: outputFile, RUNNER_TEMP: temp },
+      stderr: "piped",
+    });
+    assert(result.success, new TextDecoder().decode(result.stderr));
+
+    const path = (await readFile(outputFile, "utf8")).trim().slice(5);
+    const files = [
+      "src/prepare.ts",
+      "src/run.ts",
+      "src/post.ts",
+      "package.json",
+      "profiles.json",
+      "prompt.md",
+    ];
+    const stats = await Promise.all(files.map((file) => stat(`${path}/${file}`)));
+    for (const [index, info] of stats.entries()) {
+      assert(info.isFile(), files[index]);
+      expect(info.mode & 0o022, files[index]).toStrictEqual(0);
+    }
+  } finally {
+    await rm(temp, { recursive: true });
+  }
+});
+
+test("module-relative runtime assets exist", async () => {
+  const module = new URL("../src/run.ts", import.meta.url);
+  const source = await readFile(module, "utf8");
+  const assets = [...source.matchAll(/new URL\("([^"]+)", import\.meta\.url\)/gu)].map(
+    ([, asset = ""]) => new URL(asset, module),
+  );
+  const stats = await Promise.all(assets.map((asset) => stat(asset)));
+  for (const [index, info] of stats.entries()) {
+    assert(info.isFile(), assets[index]?.pathname);
+  }
+});
+
+test("the repository uses its trusted main action", async () => {
+  const workflow = await yaml(".gitea/workflows/agents.yml");
+  const job = mapping(mapping(workflow.jobs, "jobs").agent, "jobs.agent");
+  const permissions = mapping(job.permissions, "jobs.agent.permissions");
+  expect(permissions).toStrictEqual({
+    code: "write",
+    issues: "write",
+    "pull-requests": "write",
+  });
+  const steps = sequence(job.steps, "jobs.agent.steps");
+  expect(steps.findIndex((step) => step.uses === "./")).toStrictEqual(-1);
+  const trusted = findStep(steps, "uses", "https://git.capsulizers.com/commons/bot-agents@main");
+  expect(mapping(trusted.with, "trusted.with")["master-key"]).toBe(
+    "${{ secrets.BOT_AGENTS_MASTER_KEY }}",
+  );
+  expect(JSON.stringify(workflow).includes("gitea.actor != 'bot'")).toBe(true);
+});
+
+test("CI checks every phase and the root isolation suite", async () => {
+  const workflow = await yaml(".gitea/workflows/check.yml");
+  const job = mapping(mapping(workflow.jobs, "jobs").check, "jobs.check");
+  const commands = sequence(job.steps, "jobs.check.steps")
+    .map((step) => (typeof step.run === "string" ? step.run : ""))
+    .join("\n");
+  // `vp check` type-checks every phase, and `vp test` runs each of them under
+  // Node as well as the root-only isolation tests.
+  assert(commands.includes("npm ci"));
+  assert(commands.includes("vp check"));
+  assert(commands.includes("vp test"));
+});
+
+test("uses the standard Skills installer without custom discovery", async () => {
+  const runner = await readFile("src/run.ts", "utf8");
+  assert(runner.includes("skills add obra/superpowers"));
+  const removed = await stat("superpowers.ts").then(
+    () => false,
+    (error: unknown) => isNotFound(error),
+  );
+  assert(removed, "superpowers.ts should be removed");
+});
+
+test("installs the OpenCode CLI", async () => {
+  const action = await readFile("action.yml", "utf8");
+  assert(action.includes("opencode-ai"));
+});
+
+test("profile preparation does not receive provider credentials", async () => {
+  const runner = await readFile("src/run.ts", "utf8");
+  assert(runner.includes("await prepareProfile(profile);"));
+  expect(runner.includes("prepareProfile(profile, token)")).toBe(false);
+});
+
+test("central profiles fall back from Codex to Claude to OpenCode", async () => {
+  const credentials: unknown = JSON.parse(await readFile("profiles.json", "utf8"));
+  const profiles = sequence(mapping(credentials, "profiles.json").profiles, "profiles");
+  expect(profiles.map((profile) => profile.type)).toStrictEqual(["codex", "claude", "opencode"]);
+  expect(profiles[2]?.model).toBe("openrouter/qwen/qwen3.8-27b");
+  assert(String(profiles[2]?.token).startsWith("v1:"));
+});
@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "es2024",
+    "module": "nodenext",
+    "lib": ["es2024"],
+    "types": ["node"],
+    "noEmit": true,
+    "allowImportingTsExtensions": true,
+    "erasableSyntaxOnly": true,
+    "verbatimModuleSyntax": true,
+    "strict": true,
+    "exactOptionalPropertyTypes": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "allowUnreachableCode": false,
+    "allowUnusedLabels": false
+  }
+}
@@ -0,0 +1,25 @@
+import { defineConfig } from "vite-plus";
+
+import projectLint from "./scripts/project-lint.ts";
+
+export default defineConfig({
+  // Keep package.json in its hand-written order.
+  fmt: { sortPackageJson: false },
+  lint: {
+    plugins: ["typescript", "unicorn", "oxc", "import"],
+    jsPlugins: ["./scripts/project-lint.ts"],
+    categories: { correctness: "error", suspicious: "error", pedantic: "error", perf: "error" },
+    rules: projectLint.configs.project.rules,
+    // Repo tooling, not app code: the lint plugin compares AST node `type`s,
+    // which the AST types declare as an enum.
+    overrides: [
+      { files: ["scripts/**"], rules: { "typescript/no-unsafe-enum-comparison": "off" } },
+    ],
+    options: {
+      typeAware: true,
+      typeCheck: true,
+      maxWarnings: 0,
+      reportUnusedDisableDirectives: "error",
+    },
+  },
+});