librarian

A pi GitHub research scout inspired by pi-librarian, with a local checkout cache disabled by default.

When the librarian tool runs, it can cache/reuse repository checkouts locally. Use /librarian-cache off to force GitHub API/search and temporary fetched files only, or /librarian-cache on to re-enable cached local checkouts.

The internal librarian subagent uses a lightweight auto-selected model by default and requests medium thinking. Use /librarian-config to set a persistent internal model or thinking-level preference.

Install

Standalone npm package

pi install npm:@diegopetrucci/pi-librarian

Collection package

pi install npm:@diegopetrucci/pi-extensions

GitHub package

pi install git:github.com/diegopetrucci/pi-extensions

Then reload pi:

/reload

Behavior

• Tool name: librarian
• Uses a restricted subagent with bash and read
• Uses gh for GitHub search/API access
• Uses cached local checkouts only when enabled
• Toggle cache behavior for future calls with /librarian-cache on | off | toggle | status
• Configure internal subagent defaults with /librarian-config status | model <provider/model|auto|current> | thinking <off|minimal|low|medium|high|xhigh|auto> | clear [all|model|thinking]
• Cached repos are removed lazily after 7 days without use

Commands

/librarian-cache status
/librarian-cache off
/librarian-cache on
/librarian-cache toggle

/librarian-config status
/librarian-config model auto
/librarian-config model current
/librarian-config model anthropic/claude-haiku-4-5:medium
/librarian-config thinking medium
/librarian-config clear model

The commands work in interactive mode, RPC mode, and print/JSON mode. They write global preferences to ~/.pi/agent/extensions/librarian.json, so separate non-UI invocations use the same settings. In non-UI modes, command feedback is written to stderr so stdout remains usable for normal output or JSON events.

Cache location

macOS:

~/Library/Caches/pi-librarian/repos/github.com/<owner>/<repo>

Linux:

${XDG_CACHE_HOME:-~/.cache}/pi-librarian/repos/github.com/<owner>/<repo>

Windows:

%LOCALAPPDATA%\pi-librarian\repos\github.com\<owner>\<repo>

Override the cache root if needed:

export PI_LIBRARIAN_CACHE_ROOT="$HOME/Library/Caches/pi-librarian/repos"

Requirements

• GitHub CLI (gh) installed and authenticated for private repositories you want to inspect
• git for local checkout caching
• common shell tools such as rg, jq, and base64 for best results

Notes

Do not install this alongside another extension that registers a librarian tool unless you intentionally want duplicate/conflicting tool names.