acp-router

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• SKILL.md

SKILL.md (first lines)

# ACP Harness Router

When user intent is "run this in Pi/Claude Code/Codex/OpenCode/Gemini (ACP harness)", do not use subagent runtime or PTY scraping. Route through ACP-aware flows.

## Intent detection

Trigger this skill when the user asks ErnOS to:

- run something in Pi / Claude Code / Codex / OpenCode / Gemini
- continue existing harness work
- relay instructions to an external coding harness
- keep an external harness conversation in a thread-like conversation

## Mode selection

Choose one of these paths:

1. ErnOS ACP runtime path (default): use `sessions_spawn` / ACP runtime tools.
2. Direct `acpx` path (telephone game): use `acpx` CLI through `exec` to drive the harness session directly.

Use direct `acpx` when one of these is true:

- user explicitly asks for direct `acpx` driving
- ACP runtime/plugin path is unavailable or unhealthy
- the task is "just relay prompts to harness" and no ErnOS ACP lifecycle features are needed

Do not use:

- `subagents` runtime for harness control
- `/acp` command delegation as a requirement for the user
- PTY scraping of pi/claude/codex/opencode/gemini CLIs when `acpx` is available

## AgentId mapping

Use these defaults when user names a harness directly:

- "pi" -> `agentId: "pi"`
- "claude" or "claude code" -> `agentId: "claude"`
- "codex" -> `agentId: "codex"`
- "opencode" -> `agentId: "opencode"`
- "gemini" or "gemini cli" -> `agentId: "gemini"`

These defaults match current acpx built-in aliases.

If policy rejects the chosen id, report the policy error clearly and ask for the allowed ACP agent id.

## ErnOS ACP runtime path

Required behavior:

1. Use `sessions_spawn` with:
   - `runtime: "acp"`
   - `thread: true`
   - `mode: "session"` (unless user explicitly wants one-shot)
2. Put requested work in `task` so the ACP session gets it immediately.
3. Set `agentId` explicitly unless ACP default agent is known.
4. Do not ask user to run slash commands or CLI when this path works directly.

Example:

User: "spawn a test codex session in thread and tell it to say hi"

Call:

```json
{
  "task": "Say hi.",
  "runtime": "acp",
  "agentId": "codex",
  "thread": true,
  "mode": "session"
}
```

## Thread spawn recovery policy

When the user asks to start a coding harness in a thread (for example "start a codex/claude/pi thread"), treat that as an ACP runtime request and try to satisfy it end-to-end.

Required behavior when ACP backend is unavailable:

1. Do not immediately ask the user to pick an alternate path.
2. First attempt automatic local repair:
   - ensure plugin-local pinned acpx is installed in `extensions/acpx`
   - verify `${ACPX_CMD} --version`
3. After reinstall/repair, restart the gateway and explicitly offer to run that restart for the user.
4. Retry ACP thread spawn once after repair.
5. Only if repair+retry fails, report the concrete error and then offer fallback options.

When offering fallback, keep ACP first:

- Option 1: retry ACP spawn after showing exact failing step
- Option 2: direct acpx telephone-game flow

Do not default to subagent runtime for these requests.

## ACPX install and version policy (direct acpx path)

For this repo, direct `acpx` calls must follow the same pinned policy as the `@ernos/acpx` extension.

1. Prefer plugin-local binary, not global PATH:
   - `./extensions/acpx/node_modules/.bin/acpx`
2. Resolve pinned version from extension dependency:
   - `node -e "console.log(require('./extensions/acpx/package.json').dependencies.acpx)"`
3. If binary is missing or version mismatched, install plugin-local pinned version:
   - `cd extensions/acpx && npm install --omit=dev --no-save acpx@<pinnedVersion>`
4. Verify before use:
   - `./extensions/acpx/node_modules/.bin/acpx --version`
5. If install/repair changed ACPX artifacts, restart the gateway and offer to run the restart.
6. Do not run `npm install -g acpx` unless the user explicitly asks for global install.

Set and reuse:

```bash
ACPX_CMD="./extensions/acpx/node_modules/.bin/acpx"
```

## Direct acpx path ("telephone game")

Use this path to drive harness sessions without `/acp` or subagent runtime.

From Cyandex/ErnOS, MIT.

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