tintinweb/pi-subagents

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# @tintinweb/pi-subagents

A [pi](https://pi.dev) extension that brings **Claude Code-style autonomous sub-agents** to pi. Spawn specialized agents that run in isolated sessions — each with its own tools, system prompt, model, and thinking level. Run them in foreground or background, steer them mid-run, resume completed sessions, and define your own custom agent types.

<img width="600" alt="pi-subagents screenshot" src="https://github.com/tintinweb/pi-subagents/raw/master/media/screenshot.png" />


https://github.com/user-attachments/assets/8685261b-9338-4fea-8dfe-1c590d5df543


## Features

- **Claude Code look & feel** — same tool names, calling conventions, and UI patterns (`Agent`, `get_subagent_result`, `steer_subagent`) — feels native
- **Parallel background agents** — spawn multiple agents that run concurrently with automatic queuing (configurable concurrency limit, default 4) and smart group join (consolidated notifications)
- **Live widget UI** — persistent above-editor widget with animated spinners, live tool activity, token counts, and colored status icons. Configurable via `/agents → Settings → Widget`: `all` (every agent), `background` (default — hides foreground runs, which already render inline as the `Agent` tool result), or `off`
- **FleetView** — Claude Code-style navigable list of `main` + every running subagent rendered below the editor (earliest-launched first). Press `↓` (or `←`) at an empty prompt to jump in, `↑`/`↓` to move the selection, `Enter` to open the selected agent's live, auto-updating conversation, `Esc` to return. Finished agents linger briefly before dropping out, and a viewer stays open through completion so you can read the final output. Toggle via `/agents → Settings → Fleet view`
- **Conversation viewer** — select any agent in `/agents` to open a live-scrolling overlay of its full conversation (auto-follows new content, scroll up to pause). Steer a running agent inline by pressing `Enter` to open a composer, typing, then `Enter` to send (`Esc` or an empty submit returns) — the message appears as a user message and redirects the agent after its current tool. Stop a still-running agent by pressing `x` (then `x` again to confirm) — both work for background agents too
- **Custom agent types** — define agents in `.pi/agents/<name>.md` or `.agents/agents/<name>.md` (project) or globally, with YAML frontmatter: custom system prompts, model selection, thinking levels, tool restrictions
- **Nested subagents** — opt-in, default-off delegation: a custom agent that sets `allowed_subagents` gets its own ownership-scoped `Agent`, `get_subagent_result`, and `steer_subagent` tools, depth-capped from the main session (default 2). It can control only its own children, they are stopped when it finishes, and their transcripts and token spend roll up to it. The allowlist is a privilege boundary — a child runs with its own tools, so pick it as carefully as `tools:` itself
- **Mid-run steering** — inject messages into running agents to redirect their work without restarting

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