pi-mcp-extension

irahardianto/pi-mcp-extension is an open-source project by irahardianto: Full-featured, lightweight MCP extension for the Pi coding agent: stdio, SSE & Streamable HTTP transports, OAuth 2.1 (PKCE + DCR), lazy/eager lifecycles — minimal dependencies, zero bloat.. Indexed here so it can be found — not resold.

It is free. Get it from the upstream repository: https://github.com/irahardianto/pi-mcp-extension

From the project's own README (excerpt, reproduced for discovery under its MIT license):

pi-mcp-extension

Connect Pi to any MCP server. Supabase, DeepSource, Playwright, Context7, filesystem, databases — if it speaks MCP, Pi can use it.

pi-mcp-extension is a production-ready Model Context Protocol client extension for the Pi coding agent. It manages server connections, discovers tools, and bridges them into Pi so the LLM can call them directly.

Features • Multi-transport — stdio subprocesses, streamable-http (including "http" and URL-only shorthand), and legacy sse out of the box • Auto-discovery — Paginated tools/list with cursor following (MCP 2025-03-26 spec) • Live tool refresh — notifications/tools/listchanged triggers re-discovery without restart • Clean cancellation — AbortSignal propagation via notifications/cancelled • Smart reconnection — Fixed delay retry schedule (1s → 3s → 5s → 10s → 30s), configurable max retries, and automatic recovery when a server transport closes unexpectedly • Health checks — Opt-in periodic pings to detect stale connections • Safe process lifecycle — Child PID tracking (StdioClientTransport.pid) with safety-net SIGKILL for orphaned subprocesses • Stable tool names — Sanitized, collision-avoiding names (max 64 chars) that stay constant across reconnects • No tool churn — Activate/deactivate pattern ensures tools don't flicker during reconnection • Layered config & trust boundary — Global /mcp.json, project .pi/mcp.json (loaded only in trusted projects via ctx.isProjectTrusted()), and Pi 1.x extension-registered servers (pi.registerMcpServer()) • Rich tool results & annotations — MCP image content passthrough (ImageContent), plus readOnlyHint, destructiveHint, idempotentHint, openWorldHint surfaced in tool descriptions • On-demand agent tools & commands — mcpstatus and mcpconnect agent tools plus /mcp,…