obra/external-subagents

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# codex-subagent-cli A TypeScript CLI for launching and managing Codex subagents without bloating the primary agent's context. Threads run via `codex exec --json`, with metadata stored under `.codex-subagent`. ## Getting Started ```bash cd dev npm install npm run build ``` All commands assume Node 20+ and npm 10+. The build outputs `codex-subagent` to the repo root. ## CLI Usage ``` codex-subagent <command> [options] ``` ### Installing as a Codex Skill Clone this repository to `~/.codex/skills/using-subagents-as-codex/`: ```bash git clone https://github.com/obra/external-subagents ~/.codex/skills/using-subagents-as-codex cd ~/.codex/skills/using-subagents-as-codex/dev npm install npm run build ``` Codex will use the relative path `codex-subagent` when invoking the CLI from the skill. ### Global flags - `--root <path>`: override the default `.codex-subagent` root. - `--controller-id <id>`: override the auto-detected controlling Codex session (use this when multiple Codex windows should share the same subagent state). | Command | Purpose | | --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `start` | Launch a new Codex exec thread with explicit role/policy (defaults to **detached**, so it returns immediately; add `--wait` to block). | | `send` | Resume an existing thread with a new prompt (defaults to **detached**, add `--wait` to block). | | `peek` | Show the newest unseen assistant message (read-only; `--verbose` prints last-activity info). | | `log` | View the stored NDJSON history (supports `--tail`, `--raw`, `--verbose`). | | `status` | Summarize the latest activity for a thread (latest message, idle time, optional log tail). | | `watch` | Continuously peek a thread at an interval (use `--duration-ms` to exit cleanly). | | `wait` | Block until specific threads (or labels/all threads) reach a stopped state; optional timeout + “follow last assistant” output. | | `archive` | Move completed thread logs/state into `.codex-subagent/archive/...` (with `--yes`/`--dry-run`). | | `label` | Attach/update a friendly label for a thread so `list` is easier to scan. | | `list` | List every thread owned by the current controller (and show a “Launch diagnostics” section when detached `start`/`send` attempts are still pending or have failed, including error logs). | Per-command notes: - `start` requires `--role`, `--policy`, and `--prompt-file` (write prompts to files to avoid shell quoting issues). Policies are mapped to safe `--sandbox` / `--profile` combinations automatically. - `start --manifest tasks.json` (or `--manifest-stdin`) launches multiple prompts from a single JSON payload. Each task entry accepts `prompt`, `role`, `policy`, `cwd`, `label`, `persona`, `outputLast`, and `wait`. This is the fastest way to spin up a whole squad of helpers; reference prompts inline in JSON so you don’t have to create dozens of temp files. - `start --json prompt.json` (or `--json -` with stdin) accepts a single structured payload: `{ "prompt": "...", "role": "researcher", "policy": "workspace-write", "cwd": "/repo", "label": "Task", "persona": "reviewer", "output_last": "last.txt", "wait": true }`. Fields mirror the CLI flags, so you can drop prompt files entirely for ad-hoc work. - `send --json followup.json` works the same way for resume turns (`prompt`, `cwd`, `persona`, `output_last`, `wait`). - `start` warns that long-running Codex sessions may take minutes or hours. Use the default detached mode when you just want the work to continue in the background, and `--wait` when you truly need to stream the run inline. - `start`/`send` accept `--cwd <path>` to automatically prepend “work inside /path” instructions, `--label` to tag new threads, and `--persona <name>` to merge Anthropic-style agent personas (project `.codex/agents/`, `~/.codex/agents/`, superpowers `agents/`). Model aliases (`haiku`, `sonnet`, `opus`, `inherit`) are mapped onto safe Codex policies; if a persona sets `model: sonnet`, we’ll use `workspace-write`, etc. - `send` needs `--thread` + `--prompt-file` and, like `start`, runs detached unless you pass `--wait`. If a persona was set when the thread started, later `send` calls reuse the same persona automatically unless you override it with `--persona`. - `peek`, `log`, `watch` all require `--thread` and never call Codex (they read the local log/registry). `peek`/`log` accept `--verbose` to print last activity timestamps even when nothing changed; `watch` adds `--duration-ms` so you can stop polling automatically instead of relying on Ctrl+C. - `status --thread <id> [--tail 5] [--stale-minutes 15]` gives a one-shot summary (latest assistant turn, idle duration, and a suggestion to nudge if the thread has been idle longer than the threshold). - `wait --threads id1,id2 --follow-last` polls the registry/logs until every selected thread stops. Use `--labels label-a,label-b` or `--all-controller` to track batches launched via manifests, `--interval-ms` to tune polling frequency, and `--timeout-ms` to fail fast instead of waiting forever. When `--follow-last` is set you’ll also see the final assistant reply for each thread as it finishes. - `--print-prompt` shows the fully composed prompt (persona + working directory instructions) before launching Codex. Add `--dry-run` to skip the Codex invocation entirely after printing—handy for sanity-checking inputs. - `label --thread <id> --label "Task X"` lets you rename an existing thread after the fact (pass an empty string to clear it). - `archive --thread <id> --yes` moves a completed thread into the archive. Use `--completed --yes` to archive all completed threads, or `--dry-run` to preview. - `list` now prints a `Launch diagnostics` section whenever a detached `start`/`send` attempt hasn’t reached Codex yet or failed immediately. Failed launches appear with `NOT RUNNING` plus the captured error message and a pointer to `.codex-subagent/state/launch-errors/<launch-id>.log`; pending launches older than ~2 minutes emit a “still waiting for Codex” warning so you know to investigate. ### JSON prompt payloads Skip ad-hoc prompt files by piping JSON straight into `start` or `send`: ```bash cat <<'JSON' | codex-subagent start \ --role researcher \ --policy workspace-write \ --json - \ --print-prompt { "prompt": "List open bugs, then propose a fix.", "cwd": "/Users/jesse/repos/service", "label": "Bug sweep", "persona": "triage", "output_last": "/tmp/bugs-last.txt", "wait": true } JSON ``` The same schema works for `send`: ```bash codex-subagent send --thread 019... --json followup.json --wait ``` Relative paths inside the JSON payload are resolved against the file’s directory (or the current working directory when using stdin), so you can keep everything self-contained beside your manifest/prompt files. ### Launch diagnostics & troubleshooting - **Where errors live:** Every detached `start`/`send` attempt writes a record to `.codex-subagent/state/launches.json` until Codex produces a thread turn. If launch fails (missing profile, sandbox denial, etc.), the CLI preserves the full stderr/stack under `.codex-subagent/state/launch-errors/<launch-id>.log` and `list` marks the attempt as `NOT RUNNING`. - **How to detect issues:** Run `codex-subagent list` after launching helpers. If the `Launch diagnostics` section shows a pending attempt with the warning “still waiting for Codex (no thread yet),” Codex hasn’t even started—re-run the prompt or inspect the log file. Failed entries include the exact error plus the log path so you can fix the root cause before retrying. - **Thread failures after resume:** When a detached `send` fails, the owning thread’s status flips to `NOT RUNNING` and the reason appears via `list` + `status`. `status --thread <id>` now prints the failure message directly, so you can summarize the issue without re-reading the log. - **Home directory sandboxing:** If the environment blocks writes to `~/.codex` (common under workspace-only sandboxes), `codex-subagent` automatically runs `codex exec` with `CODEX_HOME=./.codex-home` (created in the current working directory) and best-effort copies `~/.codex/auth.json` + `~/.codex/config.toml` into it. `.codex-home/` is gitignored but contains credentials—treat it like a secret. - **Claude backend (optional):** Claude support is behind a feature flag. Set `CODEX_SUBAGENT_ENABLE_CLAUDE=1` to use `--backend claude`. ### Demo `npm run demo` spins up a throwaway thread and then attaches `watch` so you can see updates flow through without any manual wiring. ## Development - Format: `npm run format:fix` - Lint: `npm run lint` - Type-check: `npm run typecheck` - Tests: `npm run test` - Build bundle: `npm run build` `peek`/`log`/`watch` share NDJSON logs under `.codex-subagent/logs/<thread>.ndjson`. Registry metadata lives in `.codex-subagent/state/threads.json` (commit this file only when intentionally sharing test fixtures). ## Policies & Safety Subagents must never run in "allow everything" mode. The CLI enforces this by refusing dangerous policies and mapping safe ones to explicit `--sandbox`/`--profile` parameters when invoking `codex exec`. Every thread is also tagged with the controller session ID (auto-detected from the parent Codex process or supplied via `--controller-id`), and commands refuse to act on threads owned by some other controller.

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codex-subagents

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Spawn background subagents for parallel or long-running tasks. Use when you need research threads, context isolation, or detached execution.

Quellsprache: Englisch

2025-12-24

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