Use the unscoped eslint-plugin names in the notes

.agents/memory/bot-agents-child-processes.md

@@ -1,39 +0,0 @@
----
-description: Child processes use plain node:child_process spawn (explicit stdio, uid/gid, whole env); src/child.ts has exitCode (128+signo) and echo; no execFile maxBuffer
----
-
-Every call site calls `spawn` from `node:child_process` itself, with
-everything explicit:
-
-- **`uid`/`gid`** of the profile for anything an agent profile runs (each
-  profile is its own UID, 20000+). Never drop them.
-- **`env`** is the whole environment the child gets (a sanitized one for
-  agents); nothing from the coordinator is merged in.
-- **`stdio`**: stdin is `"ignore"` so an agent CLI never waits on input
-  (only `codex login --with-api-key` pipes the token in). Output that is not
-  read is `"ignore"`; output that is read is `"pipe"` and streamed.
-- No `execFile`/`exec`: their `maxBuffer` (1 MiB) kills a chatty child. Read
-  piped streams incrementally instead.
-
-`src/child.ts` holds what the call sites share:
-
-- **`exitCode(child)`**: call it right after `spawn`. It settles on `exit`
-  (not `close`, which a daemonized grandchild can hold open), maps a signal to
-  `128 + signo` as a shell does, and rejects on a failed start. The rejection
-  is pre-caught so it is not reported as unhandled before the caller awaits it.
-- **`echo(stream, chunk)`**: writes and waits for `drain` when the buffer is
-  full, so echoing never outruns a slow reader.
-
-Tests use `spawnSync` for short commands.
-
-Other port details:
-
-- **`src/errors.ts`** `isNotFound` checks `ENOENT` (file) or `ESRCH` (process).
-- Temporary files are an exclusive `wx` create with mode `0600`.
-- `src/json.ts` holds type guards used instead of `as` casts on parsed JSON.
-- `process` and `Buffer` must come from `node:` imports:
-  `no-restricted-globals` in `scripts/project-lint.ts` enforces it
-  ([[lint-parity-never-shrinks]]).
-
-Related: how each agent CLI reports bad credentials is in
-[[agent-cli-auth-failures]].

.agents/memory/bot-agents-migration-decisions.md

@@ -1,5 +1,5 @@
 ---
-description: bot-agents migration decisions: live @main action for six repos, JSON profiles, Node 24.2+, no @cunarist plugins needed
+description: bot-agents migration decisions: live @main action for six repos, JSON profiles, Node 24.2+, Deno kept only for agents, no eslint-plugin-* packages needed
 ---
 
 Decisions for `commons/bot-agents` (Capsulizers Gitea), from the Deno to
@@ -18,10 +18,17 @@ Node + Vite+ migration (PR #20, `node-migration`, 2026-10-15/16):
 - **Node 24.2+**, not 22: `src/post.ts` uses `import.meta.main`. There is no
   `engines` (user decision 2026-10-18): the `node:24-bookworm` job image
   decides the version ([[bot-agents-runtime-no-build]]).
-- **No `@cunarist/eslint-plugin-*`.** The Deno setup enabled no plugin, so
-  this repo depends on none and CI passes without them being published.
-  Planned (2026-10-17): once the plugins are on npm, add
-  `@cunarist/eslint-plugin-modules` here for its import checks.
+- **Deno stays in the action's global npm install** (`action.yml`), only
+  because the agents still check Deno-based consumer repos (memona,
+  memona-home). Remove it once those repos have moved; it is not a
+  dependency of this repo's TypeScript.
+- **No `eslint-plugin-*` packages** (`eslint-plugin-explicit-types`,
+  `eslint-plugin-import-structure`, `eslint-plugin-lit-robust`; unscoped
+  since 2026-10-18, formerly `@cunarist/...`). The Deno setup enabled no
+  plugin, so this repo depends on none and CI passes without them being
+  published. Planned (2026-10-17): once the plugins are on npm, add
+  `eslint-plugin-import-structure` (rule prefix `import-structure/`) here for
+  its import checks.
 - **Stricter input checks were accepted** in the migration: Gitea `/user` and
   comment responses, the runtime manifest, and the outcome's profile type are
   validated; some type errors became `TypeError` with the same messages.

.agents/memory/bot-agents-node-command-shim.md

@@ -0,0 +1,25 @@
+---
+description: src/command.ts reproduces Deno.Command on child_process.spawn (stdio defaults, clearEnv, uid/gid, 128+signo); src/errors.ts maps NotFound to ENOENT/ESRCH
+---
+
+The Deno code was ported one for one; two small modules keep the old shapes
+so callers barely changed:
+
+- **`src/command.ts`** wraps `child_process.spawn` with `Deno.Command`'s API:
+  `output()` and `spawn()`, `clearEnv`, `uid`/`gid` (the agent isolation runs
+  each profile as its own UID, 20000+), and Deno's stdio defaults: stdin
+  inherited; stdout/stderr piped for `output()`, inherited for `spawn()`. A
+  signal exit maps to status `128 + signo`. Status settles on process exit,
+  not on stream close. Use it instead of calling `node:child_process`
+  directly so isolation and status handling stay uniform.
+- **`src/errors.ts`** replaces `Deno.errors.NotFound` checks with an
+  `ENOENT`/`ESRCH` code check.
+- `makeTempFile` became an exclusive `wx` create with mode `0600`.
+- `src/json.ts` holds type guards used instead of `as` casts on parsed JSON.
+- `process` and `Buffer` must come from `node:` imports:
+  `no-restricted-globals` in `scripts/project-lint.ts` maps Deno's
+  `no-window`/`no-process-global`/`no-node-globals` there
+  ([[lint-parity-never-shrinks]]).
+
+Related: how each agent CLI reports bad credentials is in
+[[agent-cli-auth-failures]].

.agents/memory/bot-agents-tests-root-only.md

@@ -1,5 +1,5 @@
 ---
-description: Isolation and credential tests need root and use test.skipIf(!IS_ROOT); locally 5 skip, CI runs as root so all 66 run; verify isolation changes in node:24-bookworm as root
+description: Isolation and credential tests need root and use test.skipIf(!IS_ROOT); locally 5 skip, CI runs as root so all 61 run; verify isolation changes in node:24-bookworm as root
 ---
 
 Some tests exercise real UID isolation, process cleanup, and `prepare.ts`
@@ -7,10 +7,10 @@ credential cleanup. They need root and are written as
 `test.skipIf(!IS_ROOT)(...)` (`IS_ROOT` from `#testing`), so they show
 as skipped instead of silently passing.
 
-- As a normal user `vp test` passes 61 and skips 5. In CI (self-hosted
-  runner, root) all 66 run.
+- As a normal user `vp test` passes 56 and skips 5. In CI (self-hosted
+  runner, root) all 61 run.
 - When changing `isolation.ts`, `runtime.ts`, `credentials.ts`, `prepare.ts`,
-  or `child.ts`, run the suite as root in `node:24-bookworm` (e.g. a
+  or `command.ts`, run the suite as root in `node:24-bookworm` (e.g. a
   container with the repo mounted) before pushing; a green non-root run
   proves nothing about those paths.
 - The migration also ran an end-to-end smoke as root with fake

.agents/memory/imports-aliases-barrels.md

@@ -11,23 +11,25 @@ unbuilt. `vp pack` inlines them, so they never reach package consumers.
 
 One rule for every file, never tied to folder or file names (user rule
 2026-10-17; it replaces the earlier "aliases only point at direct `src/`
-subfolders" rule as the general rule, and the "modules plugin checks only
-aliased folders" scope; this repo keeps the stricter rule as a local
-convention, see the last section):
+subfolders" rule as the general rule, and the "import-structure plugin
+checks only aliased folders" scope; this repo keeps the stricter rule as a
+local convention, see the last section):
 
 - **An alias may point anywhere** and owns its target. An alias to a
   folder's `index.ts` owns that folder and everything below it; an alias to
   any other file owns only that file.
 - **No overlap.** No file may be owned by 2 aliases: no alias inside another
-  alias's area, and no 2 aliases with the same target. The modules plugin's
-  `enforce-layer-order` reports it once at the top of every file 2 aliases
-  claim. Fix by merging the aliases or moving files apart.
+  alias's area, and no 2 aliases with the same target. The import-structure
+  plugin's `enforce-layer-order` reports it once at the top of every file 2
+  aliases claim. Fix by merging the aliases or moving files apart.
 - **Outside an area, only the exact alias reaches it.** A deeper alias
   specifier (`#a/one.ts`, `no-barrel-bypass`) and a relative path into the
   area (`./a/one.ts`, `no-relative-bypass`; `./b/f.ts` to a file alias,
   `prefer-alias-import`, fixed to the alias) are bypasses.
 - **Inside an area, relative imports of siblings and subfolders are free.**
-- **`../` is banned in every file**, owned or not (`no-parent-import`).
+- **A `../` import is banned in every file**, owned or not (`no-parent-import`).
+  Runtime file URLs (`new URL("../prompt.md", import.meta.url)`) are not
+  imports and are allowed.
   Anything above a file needs an alias.
 - **Files no alias owns** need no `index.ts` and no alias, and import `./`
   siblings and subfolders freely.
@@ -89,8 +91,8 @@ Relative imports are written with the `.ts` extension.
 ## Local convention: aliases target direct `src/` subfolders
 
 This is a convention of this repo only, stricter than the general rule above
-(which the published modules plugin checks and which allows more). It is not
-a plugin rule.
+(which the published import-structure plugin checks and which allows more).
+It is not a plugin rule.
 
 - Every `package.json` `imports` alias points only at the `index.ts` of a
   direct subfolder of `src/`, e.g. `"#helpers": "./src/helpers/index.ts"`.

.agents/memory/lint-config-shape.md

@@ -8,7 +8,7 @@ turn on whole categories, then list only what parity or a real need adds.
 ```ts
 lint: {
   plugins: ["typescript", "unicorn", "oxc", "import"],
-  jsPlugins: ["@cunarist/eslint-plugin-explicit-types", "./scripts/project-lint.ts"],
+  jsPlugins: ["eslint-plugin-explicit-types", "./scripts/project-lint.ts"],
   categories: { correctness: "error", suspicious: "error", pedantic: "error", perf: "error" },
   rules: { ...explicitTypes.configs.concrete.rules, ...projectLint.configs.project.rules },
   ignorePatterns: ["src/generated/**"], // generated files only, see below
@@ -40,8 +40,8 @@ lint: {
   Hand-written code is never ignored.
 - **No lint disable comments**: [[lint-no-disable-comments]].
 - **Parity:** [[lint-parity-never-shrinks]]. **Naming:** [[naming-id-match]].
-- Don't add a second import sorter; the modules plugin's `enforce-import-order` is
-  the only one, and Oxfmt's `sortImports` stays off.
+- Don't add a second import sorter; the import-structure plugin's
+  `enforce-import-order` is the only one, and Oxfmt's `sortImports` stays off.
 
 `perf` came last: in the template it flagged nine `.includes` on constant
 arrays, fixed as `ReadonlySet` + `.has()` rather than by turning a rule off.

.agents/memory/package-json-shape.md

@@ -9,7 +9,7 @@ Oxfmt's standard `package.json` sorting is accepted: there is no
 replaces the earlier hand-written order (metadata, `scripts`, `exports`,
 `imports`, `devDependencies`, `dependencies`).
 
-The `imports` key order can carry meaning: the modules plugin's
+The `imports` key order can carry meaning: the import-structure plugin's
 `enforce-layer-order` reads it as the layer order. Never reorder it casually.
 
 ## Fields
@@ -23,7 +23,7 @@ The `imports` key order can carry meaning: the modules plugin's
 - **No `peerDependencies`, ever** (user preference, 2026-10-14). If something
   is needed at runtime, it goes in `dependencies`.
 - **`dependencies`** = what runs or is type-referenced at runtime by consumers
-  (the lit plugin ships `parse5`, `oxc-parser`, `oxc-resolver`, and
+  (the lit-robust plugin ships `parse5`, `oxc-parser`, `oxc-resolver`, and
   `@eslint/core` for its public types; they stay external, never bundled).
 - **`devDependencies`** = everything else: `vite-plus`, `eslint`,
   `@typescript-eslint/parser`, `eslint-doc-generator`, `esbuild`,

AGENTS.md

@@ -29,16 +29,17 @@ below it; an alias to any other file owns only that file. No overlap: no file
 may be owned by 2 aliases, so no alias inside another alias's area and no 2
 aliases with the same target. Outside an area, only the exact alias reaches
 it; a deeper alias specifier or a relative path into the area is a bypass.
-Inside an area, relative imports of siblings and subfolders are free. `../`
-is banned in every file, owned or not
-(`import/no-relative-parent-imports`). Files no alias owns need no `index.ts`
-and no alias, and import `./` siblings and subfolders freely. The one alias
-is `#testing` (`./src/testing/index.ts`): every test imports it by alias, and
-`tests/` reaches `src/` only through it. Local convention, stricter than the
-general rule above: in this repo, aliases point only at a direct subfolder of
-`src/` (`"#helpers": "./src/helpers/index.ts"`), and code outside `src/` uses
-`./` relative imports. `scripts/` is flat: one file per
-tool, no subfolders and no `index.ts`, imported directly by file path
+Inside an area, relative imports of siblings and subfolders are free. A `../`
+import is banned in every file, owned or not
+(`import/no-relative-parent-imports`); runtime file URLs such as
+`new URL("../prompt.md", import.meta.url)` are paths, not imports, and stay.
+Files no alias owns need no `index.ts` and no alias, and import `./` siblings
+and subfolders freely. The one alias is `#testing` (`./src/testing/index.ts`):
+tests that use its helpers import it by alias, and `tests/` imports `src/`
+only through it. Local convention, stricter than the general rule above: in
+this repo, aliases point only at a direct subfolder of `src/`
+(`"#helpers": "./src/helpers/index.ts"`), and code outside `src/` uses `./`
+relative imports. `scripts/` is flat: one file per tool, no subfolders and no `index.ts`, imported directly by file path
 ([.agents/memory/imports-aliases-barrels.md](.agents/memory/imports-aliases-barrels.md)).
 
 The only config files are `package.json`, `tsconfig.json`, and
@@ -47,5 +48,6 @@ 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; do not treat those
-vendor executables as repository TypeScript dependencies.
+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.

action.yml

@@ -16,10 +16,11 @@ runs:
         fetch-depth: 0
         token: ${{ gitea.token }}
     # This step assumes this is `node:24-bookworm` container. The action runs
-    # its TypeScript on that Node directly.
+    # 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
+      run: npm install -g @openai/codex @anthropic-ai/claude-code opencode-ai deno
     # A local action lives inside the writable checkout. Execute a root-owned
     # copy so an agent changing this repository cannot replace a later phase.
     - name: Protect action source

src/auth.test.ts

@@ -17,7 +17,7 @@ test("retries once after an invalid refresh token", async () => {
   const result = await retryInvalidToken(
     () =>
       Promise.resolve({
-        code: 1,
+        status: { success: false },
         error: attempts++ === 0 ? "ERROR: invalid_refresh_token" : "still failed",
       }),
     () => {
@@ -40,7 +40,7 @@ test("does not retry an unrelated failure", async () => {
     () => {
       attempts++;
       return Promise.resolve({
-        code: 1,
+        status: { success: false },
         error: "rate limited",
       });
     },
@@ -86,7 +86,7 @@ test("re-logs in after the job 9837 revoked-session stderr", async () => {
   const result = await retryInvalidToken(
     () =>
       Promise.resolve({
-        code: attempts++ > 0 ? 0 : 1,
+        status: { success: attempts++ > 0 },
         error: attempts === 1 ? REVOKED_CODEX.join("\n") : "",
       }),
     () => {
@@ -95,9 +95,9 @@ test("re-logs in after the job 9837 revoked-session stderr", async () => {
     },
   );
 
-  expect({ relogins, code: result.code }).toStrictEqual({
+  expect({ relogins, success: result.status.success }).toStrictEqual({
     relogins: 1,
-    code: 0,
+    success: true,
   });
 });
 

src/auth.ts

@@ -48,12 +48,12 @@ export function isClaudeAuthFailure(result: ClaudeFailureFields): boolean {
   );
 }
 
-export async function retryInvalidToken<T extends { code: number; error: string }>(
+export async function retryInvalidToken<T extends { status: { success: boolean }; error: string }>(
   attempt: () => Promise<T>,
   relogin: () => Promise<void>,
 ): Promise<T> {
   let result = await attempt();
-  if (result.code !== 0 && isCodexAuthFailure(result.error)) {
+  if (!result.status.success && isCodexAuthFailure(result.error)) {
     await relogin();
     result = await attempt();
   }
@@ -111,7 +111,7 @@ export async function stageCodexAuth(
   return stagedPath;
 }
 
-// Creates an empty private file under a fresh name.
+// 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);

src/child.test.ts

@@ -1,35 +0,0 @@
-import { spawn } from "node:child_process";
-
-import { expect, test } from "vite-plus/test";
-
-import { isNotFound } from "./errors.ts";
-import { exitCode } from "./child.ts";
-
-test("reports the exit code", async () => {
-  expect(await exitCode(spawn("/bin/sh", ["-c", "exit 0"], { stdio: "ignore" }))).toBe(0);
-  expect(await exitCode(spawn("/bin/sh", ["-c", "exit 3"], { stdio: "ignore" }))).toBe(3);
-});
-
-test("reports a signal as 128 plus its number", async () => {
-  const child = spawn("/bin/sh", ["-c", "kill -KILL $$"], { stdio: "ignore" });
-  expect(await exitCode(child)).toBe(137);
-});
-
-test("resolves on exit while a grandchild still holds the output open", async () => {
-  const child = spawn("/bin/sh", ["-c", "sleep 2 & exit 5"], { stdio: ["ignore", "pipe", "pipe"] });
-  const started = Date.now();
-  expect(await exitCode(child)).toBe(5);
-  expect(Date.now() - started).toBeLessThan(1500);
-  child.stdout.destroy();
-  child.stderr.destroy();
-});
-
-test("rejects when the command does not exist", async () => {
-  const child = spawn("/nonexistent/command", [], { stdio: "ignore" });
-  const code = exitCode(child);
-  // The rejection must stay unhandled-safe until it is awaited.
-  await new Promise((resolve) => {
-    setTimeout(resolve, 50);
-  });
-  await expect(code).rejects.toSatisfy(isNotFound);
-});

src/child.ts

@@ -1,30 +0,0 @@
-// What the child process call sites share: the exit status, read right after
-// `spawn` so the exit event cannot pass unseen while the caller reads the
-// streams, and echoing output without outrunning a slow reader.
-import type { ChildProcess } from "node:child_process";
-import { once } from "node:events";
-import { constants } from "node:os";
-import type { Writable } from "node:stream";
-
-// Resolves once the process exits, before its streams close, with its exit
-// code, or with 128 plus the signal number if a signal killed it, as a shell
-// reports. A process that fails to start rejects with the spawn error.
-export function exitCode(child: ChildProcess): Promise<number> {
-  const code = new Promise<number>((resolve, reject) => {
-    child.once("error", reject);
-    child.once("exit", (exit, signal) => {
-      resolve(exit ?? (signal === null ? 1 : 128 + constants.signals[signal]));
-    });
-  });
-  // Callers await it after draining the streams; a failed start must not be
-  // reported as an unhandled rejection before then.
-  code.catch(() => {});
-  return code;
-}
-
-// Writes a chunk, waiting for the stream to drain when its buffer is full.
-export async function echo(stream: Writable, chunk: string | Uint8Array): Promise<void> {
-  if (!stream.write(chunk)) {
-    await once(stream, "drain");
-  }
-}

src/command.ts

@@ -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);
+}

src/errors.ts

@@ -1,4 +1,5 @@
-// A missing file or a missing process: Node reports them as ENOENT and ESRCH.
+// 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;

src/isolation.test.ts

@@ -1,11 +1,14 @@
-import { spawnSync } from "node:child_process";
-import type { SpawnSyncReturns } from "node:child_process";
 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 { isRunnableProfileProcess, killProfileProcesses, readProfileFile } from "./isolation.ts";
+import {
+  agentCommand,
+  isRunnableProfileProcess,
+  killProfileProcesses,
+  readProfileFile,
+} from "./isolation.ts";
 import type { RuntimeProfile } from "./runtime.ts";
 import { currentUid, IS_ROOT, IS_WINDOWS, makeTempDir } from "#testing";
 
@@ -19,23 +22,6 @@ const profile = (uid: number, home: string): RuntimeProfile => ({
   tokenFile: null,
 });
 
-// Runs a command as the profile's user from the root directory. Without `env`
-// it inherits this process's environment.
-function runAs(
-  selected: RuntimeProfile,
-  command: string,
-  args: string[],
-  env?: Record<string, string>,
-): SpawnSyncReturns<string> {
-  return spawnSync(command, args, {
-    cwd: "/",
-    uid: selected.uid,
-    gid: selected.gid,
-    encoding: "utf8",
-    ...(env !== undefined && { env }),
-  });
-}
-
 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);
@@ -74,14 +60,20 @@ test.skipIf(!IS_ROOT)("a profile process can read only its own private files", a
     await writeFile(`${root}/reviewer`, "root", { mode: 0o600 });
 
     const selected = profile(20_000, homeA);
-    const own = runAs(selected, "/bin/cat", [`${homeA}/token`]);
-    const sibling = runAs(selected, "/bin/cat", [`${homeB}/token`]);
-    const reviewer = runAs(selected, "/bin/cat", [`${root}/reviewer`]);
+    const own = await agentCommand(selected, "/bin/cat", [`${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(own.stdout).toBe("own");
-    expect(own.status).toBe(0);
-    expect(sibling.status).not.toBe(0);
-    expect(reviewer.status).not.toBe(0);
+    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 });
   }
@@ -89,8 +81,13 @@ test.skipIf(!IS_ROOT)("a profile process can read only its own private files", a
 
 test.skipIf(!IS_ROOT)("cleanup leaves no runnable daemonized process", async () => {
   const selected = profile(20_010, "/tmp");
-  const launched = runAs(selected, "/bin/sh", ["-c", "sleep 60 >/dev/null 2>&1 & echo $!"]);
-  const pid = Number(launched.stdout.trim());
+  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);
@@ -102,11 +99,14 @@ test.skipIf(!IS_ROOT)("cleanup leaves no runnable daemonized process", async ()
   expect(status === null || !isRunnableProfileProcess(status, selected.uid)).toBe(true);
 });
 
-test.skipIf(!IS_ROOT)("the agent process cannot read its coordinator environment", () => {
+test.skipIf(!IS_ROOT)("the agent process cannot read its coordinator environment", async () => {
   const selected = profile(20_020, "/tmp");
-  const result = runAs(selected, "/usr/bin/cat", [`/proc/${process.pid}/environ`], {
-    PARENT_SECRET: "must-not-cross-boundary",
-  });
+  const result = await agentCommand(selected, "/usr/bin/cat", [`/proc/${process.pid}/environ`], {
+    cwd: "/",
+    env: { PARENT_SECRET: "must-not-cross-boundary" },
+    clearEnv: true,
+    stderr: "piped",
+  }).output();
 
-  expect(result.status).not.toBe(0);
+  expect(result.success).toBe(false);
 });

src/isolation.ts

@@ -2,9 +2,31 @@ 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: 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 = /^Uid:\s+(\d+)/mu.exec(status)?.[1];
   const state = /^State:\s+(\w)/mu.exec(status)?.[1];

src/run.ts

@@ -1,12 +1,10 @@
 // Runs one ordered agent profile. Credential decryption and reviewer posting
 // live in separate processes so neither privileged secret reaches this runner.
-import { spawn } from "node:child_process";
 import { chmod, chown, readFile, writeFile } from "node:fs/promises";
 import process from "node:process";
 import { createInterface } from "node:readline";
 import type { Readable } from "node:stream";
 import { text as readText } from "node:stream/consumers";
-import { finished } from "node:stream/promises";
 import { setTimeout as sleep } from "node:timers/promises";
 
 import {
@@ -18,8 +16,9 @@ import {
   stageCodexAuth,
 } from "./auth.ts";
 import type { ClaudeFailureFields, CodexAuthentication } from "./auth.ts";
-import { echo, exitCode } from "./child.ts";
-import { killProfileProcesses, readProfileFile } from "./isolation.ts";
+import { chunks, endWith, output, writeChunk } from "./command.ts";
+import type { CommandStatus } from "./command.ts";
+import { agentCommand, killProfileProcesses, readProfileFile } from "./isolation.ts";
 import { isObject } from "./json.ts";
 import {
   collectOpenCodeOutput,
@@ -99,8 +98,8 @@ async function postAuthorComment(body: string): Promise<void> {
 }
 
 async function runRoot(command: string, args: string[]): Promise<void> {
-  const code = await exitCode(spawn(command, args, { env: PROCESS_ENV, stdio: "ignore" }));
-  if (code !== 0) 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> {
@@ -123,15 +122,12 @@ async function runAgentCommand(
   args: string[],
   token?: string,
 ): Promise<void> {
-  const child = spawn(command, args, {
+  const { success, code } = await agentCommand(profile, command, args, {
     cwd: WORKSPACE,
     env: agentEnvironment(PROCESS_ENV, profile, token),
-    uid: profile.uid,
-    gid: profile.gid,
-    stdio: "ignore",
-  });
-  const code = await exitCode(child);
-  if (code !== 0) throw new Error(`${command} ${args[0]} exited with ${code}`);
+    clearEnv: true,
+  }).output();
+  if (!success) throw new Error(`${command} ${args[0]} exited with ${code}`);
 }
 
 async function prepareProfile(profile: RuntimeProfile): Promise<void> {
@@ -193,7 +189,8 @@ async function renderPrompt(
 }
 
 async function runClaude(profile: RuntimeProfile, token: string, prompt: string): Promise<string> {
-  const claude = spawn(
+  const claude = agentCommand(
+    profile,
     "claude",
     [
       "--print",
@@ -211,21 +208,21 @@ async function runClaude(profile: RuntimeProfile, token: string, prompt: string)
         ...agentEnvironment(PROCESS_ENV, profile, token),
         IS_SANDBOX: "1",
       },
-      uid: profile.uid,
-      gid: profile.gid,
-      stdio: ["ignore", "pipe", "pipe"],
+      clearEnv: true,
+      stdout: "piped",
+      stderr: "piped",
     },
-  );
-  const status = exitCode(claude);
+  ).spawn();
   let result: ClaudeResult | undefined;
   let error = "";
   const copyError = (async (): Promise<void> => {
-    claude.stderr.setEncoding("utf8");
-    for await (const chunk of claude.stderr) {
-      const part = String(chunk);
+    const decoder = new TextDecoder();
+    for await (const chunk of chunks(claude.stderr)) {
+      const part = decoder.decode(chunk, { stream: true });
       error += part;
       console.error(part);
     }
+    error += decoder.decode();
   })();
   for await (const line of createInterface({ input: claude.stdout, crlfDelay: Infinity })) {
     if (line !== "") {
@@ -253,7 +250,7 @@ async function runClaude(profile: RuntimeProfile, token: string, prompt: string)
       }
     }
   }
-  const [code] = await Promise.all([status, copyError]);
+  const [status] = await Promise.all([claude.status, copyError]);
   if (result?.is_error === true) {
     const failure = new Error(result.result ?? `claude ended with ${result.subtype}`);
     if (isClaudeAuthFailure(result)) {
@@ -264,8 +261,8 @@ async function runClaude(profile: RuntimeProfile, token: string, prompt: string)
   if (result?.result === undefined) {
     throw new Error(error.trim() || `claude ended with ${result?.subtype ?? "no result"}`);
   }
-  if (code !== 0) {
-    throw new Error(error.trim() || `claude exited with ${code}`);
+  if (!status.success) {
+    throw new Error(error.trim() || `claude exited with ${status.code}`);
   }
   return result.result;
 }
@@ -273,7 +270,7 @@ async function runClaude(profile: RuntimeProfile, token: string, prompt: string)
 // Polls every 100 ms until the login prints something, failing if it exits first.
 async function pollForInstructions(
   shownText: () => string,
-  status: Promise<number>,
+  status: Promise<CommandStatus>,
 ): Promise<void> {
   if (shownText().trim() !== "") {
     return;
@@ -289,28 +286,29 @@ async function codexDeviceLogin(
   profile: RuntimeProfile,
   environment: Record<string, string>,
 ): Promise<void> {
-  const login = spawn("codex", ["login", "--device-auth"], {
+  const login = agentCommand(profile, "codex", ["login", "--device-auth"], {
     cwd: WORKSPACE,
     env: environment,
-    uid: profile.uid,
-    gid: profile.gid,
-    stdio: ["ignore", "pipe", "pipe"],
-  });
-  const status = exitCode(login);
+    clearEnv: true,
+    stdout: "piped",
+    stderr: "piped",
+  }).spawn();
   let shown = "";
   const collect = async (stream: Readable): Promise<void> => {
-    stream.setEncoding("utf8");
-    for await (const chunk of stream) {
-      shown += String(chunk);
+    const decoder = new TextDecoder();
+    for await (const chunk of chunks(stream)) {
+      shown += decoder.decode(chunk, { stream: true });
     }
+    shown += decoder.decode();
   };
   const drained = Promise.all([collect(login.stdout), collect(login.stderr)]);
+  const status = login.status;
   await sleep(3000);
   await pollForInstructions(() => shown, status);
   await postAuthorComment(withProfile(shown, profile));
-  const [code] = await Promise.all([status, drained]);
-  if (code !== 0) {
-    throw new AgentAuthError(`codex login exited with ${code}`);
+  const [result] = await Promise.all([status, drained]);
+  if (!result.success) {
+    throw new AgentAuthError(`codex login exited with ${result.code}`);
   }
 }
 
@@ -319,19 +317,17 @@ async function codexApiLogin(
   environment: Record<string, string>,
   token: string,
 ): Promise<void> {
-  const login = spawn("codex", ["login", "--with-api-key"], {
+  const login = agentCommand(profile, "codex", ["login", "--with-api-key"], {
     cwd: WORKSPACE,
     env: environment,
-    uid: profile.uid,
-    gid: profile.gid,
-    stdio: ["pipe", "inherit", "pipe"],
-  });
-  const status = exitCode(login);
-  login.stdin.end(`${token}\n`);
-  await finished(login.stdin);
-  const [code, error] = await Promise.all([status, readText(login.stderr)]);
-  if (code !== 0) {
-    throw new Error(error.trim() || `codex login exited with ${code}`);
+    clearEnv: true,
+    stdin: "piped",
+    stderr: "piped",
+  }).spawn();
+  await endWith(login.stdin, `${token}\n`);
+  const [status, error] = await Promise.all([login.status, readText(login.stderr)]);
+  if (!status.success) {
+    throw new Error(error.trim() || `codex login exited with ${status.code}`);
   }
 }
 
@@ -353,18 +349,17 @@ async function runCodex(
   if (authentication.kind === "api-key") {
     await codexApiLogin(profile, environment, authentication.token);
   } else {
-    const check = spawn("codex", ["login", "status"], {
+    const loggedIn = await agentCommand(profile, "codex", ["login", "status"], {
       cwd: WORKSPACE,
       env: environment,
-      uid: profile.uid,
-      gid: profile.gid,
-      stdio: "ignore",
-    });
-    if ((await exitCode(check)) !== 0) await codexDeviceLogin(profile, environment);
+      clearEnv: true,
+    }).output();
+    if (!loggedIn.success) await codexDeviceLogin(profile, environment);
   }
   const outputPath = await makeProfileFile(profile, "result.md");
-  const attempt = async (): Promise<{ code: number; error: string }> => {
-    const codex = spawn(
+  const attempt = async (): Promise<{ status: CommandStatus; error: string }> => {
+    const codex = agentCommand(
+      profile,
       "codex",
       [
         "exec",
@@ -378,21 +373,20 @@ async function runCodex(
       {
         cwd: WORKSPACE,
         env: environment,
-        uid: profile.uid,
-        gid: profile.gid,
-        stdio: ["ignore", "inherit", "pipe"],
+        clearEnv: true,
+        stdout: "inherit",
+        stderr: "piped",
       },
-    );
-    const status = exitCode(codex);
-    codex.stderr.setEncoding("utf8");
+    ).spawn();
+    const decoder = new TextDecoder();
     let error = "";
-    for await (const chunk of codex.stderr) {
-      const part = String(chunk);
-      await echo(process.stderr, part);
-      error += part;
+    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 { code: await status, error: error.replaceAll(prompt, "") };
+    return { status: await codex.status, error: error.replaceAll(prompt, "") };
   };
   const result =
     authentication.kind === "api-key"
@@ -401,8 +395,8 @@ async function runCodex(
           await runAgentCommand(profile, "codex", ["logout"]);
           await codexDeviceLogin(profile, environment);
         });
-  if (result.code !== 0) {
-    const failure = new Error(result.error.trim() || `codex exited with ${result.code}`);
+  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 });
     }
@@ -416,24 +410,29 @@ async function runOpenCode(
   token: string,
   prompt: string,
 ): Promise<string> {
-  const child = spawn("opencode", openCodeArgs(profile.model, prompt), {
+  const child = agentCommand(profile, "opencode", openCodeArgs(profile.model, prompt), {
     cwd: WORKSPACE,
     env: agentEnvironment(PROCESS_ENV, profile, token),
-    uid: profile.uid,
-    gid: profile.gid,
-    stdio: ["ignore", "pipe", "pipe"],
-  });
-  const status = exitCode(child);
+    clearEnv: true,
+    stdout: "piped",
+    stderr: "piped",
+  }).spawn();
   const collected = collectOpenCodeOutput(
-    child.stdout,
-    child.stderr,
-    (chunk) => echo(process.stdout, chunk),
-    (chunk) => echo(process.stderr, chunk),
+    chunks(child.stdout),
+    chunks(child.stderr),
+    async (chunk) => {
+      await writeChunk(process.stdout, chunk);
+    },
+    async (chunk) => {
+      await writeChunk(process.stderr, chunk);
+    },
   );
-  const [code, streams] = await Promise.all([status, collected]);
+  const [status, streams] = await Promise.all([child.status, collected]);
   const error = streams.stderr.trim();
-  if (code !== 0) {
-    throw openCodeError(streams.stdout) ?? new Error(error || `opencode exited with ${code}`);
+  if (!status.success) {
+    throw (
+      openCodeError(streams.stdout) ?? new Error(error || `opencode exited with ${status.code}`)
+    );
   }
   return parseOpenCodeEvents(streams.stdout);
 }

src/runtime.test.ts

@@ -1,10 +1,10 @@
-import { spawnSync } from "node:child_process";
 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";
@@ -13,9 +13,14 @@ const MASTER_KEY = "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8";
 const ENCRYPTED = "v1:ICEiIyQlJicoKSor:oV_FAgnsN3p1FyegJxwGVdyjfyPio6qDeSUwbA";
 
 // Runs `command` as the profile's user, from the root directory.
-function runAs(profile: RuntimeProfile, command: string, path: string): boolean {
-  const result = spawnSync(command, [path], { cwd: "/", uid: profile.uid, gid: profile.gid });
-  return result.status === 0;
+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> {
@@ -53,16 +58,16 @@ test.skipIf(!IS_ROOT)("prepares root-only reviewer and isolated profile credenti
     expect((await stat(codex.home)).uid).toStrictEqual(codex.uid);
     expect(codex.tokenFile).toBe(null);
 
-    const ownToken = spawnSync("/bin/cat", [claude.tokenFile], {
+    const ownToken = await output("/bin/cat", {
+      args: [claude.tokenFile],
       cwd: "/",
       uid: claude.uid,
       gid: claude.gid,
-      encoding: "utf8",
     });
-    expect(ownToken.status).toBe(0);
-    expect(ownToken.stdout).toBe("secret-token");
-    expect(runAs(claude, "/bin/cat", manifest.reviewerFile)).toBe(false);
-    expect(runAs(claude, "/bin/ls", codex.home)).toBe(false);
+    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 });
@@ -80,20 +85,18 @@ test.skipIf(!IS_ROOT)("removes prepared credentials when output publication fail
         profiles: [{ type: "claude", token: ENCRYPTED }],
       }),
     );
-    const result = spawnSync(
-      process.execPath,
-      [fileURLToPath(new URL("prepare.ts", import.meta.url))],
-      {
-        env: {
-          ACTION_PATH: action,
-          RUNNER_TEMP: root,
-          BOT_AGENTS_MASTER_KEY: MASTER_KEY,
-          GITHUB_OUTPUT: action,
-        },
+    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.status).not.toBe(0);
+    expect(result.success).toBe(false);
     expect(await readdir(root)).toStrictEqual([]);
   } finally {
     await rm(root, { recursive: true });

tests/workflow.test.ts

@@ -162,11 +162,6 @@ test("installs the OpenCode CLI", async () => {
   assert(action.includes("opencode-ai"));
 });
 
-test("does not install Deno", async () => {
-  const action = await readFile("action.yml", "utf8");
-  expect(action).not.toMatch(/\bdeno\b/iu);
-});
-
 test("profile preparation does not receive provider credentials", async () => {
   const runner = await readFile("src/run.ts", "utf8");
   assert(runner.includes("await prepareProfile(profile);"));