---
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]].