acp

ACP agent orchestration - spawn external coding agents (Claude Code, Codex) to work on tasks via the Agent Client Protocol. Each agent runs as its own subprocess speaking ACP over stdio and streams results back into the conversation. ## Usage Use `acp_spawn` to delegate a coding task to an external agent. The agent runs as a subprocess speaking the ACP protocol over stdio and streams results back. Users can refer to agents by natural names: "claude code", "codex cli", and "openai codex" all resolve to the canonical `claude` and `codex` ids (unless the user's config defines an agent literally keyed by that name, which always wins). ## First-time setup ACP is always available - default profiles for `claude` and `codex` ship out-of-box, so no config edit is needed to start. First-time setup is just making the adapter binary available, then spawning: 1. Install the adapter binary if it's missing. This happens automatically: when `acp_spawn` finds the agent's binary missing from PATH, the assistant installs it once via a sandboxed bun global install and proceeds in the same call (see "Automatic adapter availability" below). 2. Call `acp_spawn`. Do NOT run `vellum sleep && vellum wake` - that kills the conversation. ## Automatic adapter availability When `acp_spawn` finds the agent's binary missing from PATH, the assistant installs it once via a sandboxed bun global install and then runs the real installed binary. The install runs in a fresh empty temporary directory (neve...