second-brain-github-mcp

A small, authenticated remote MCP server that lets an AI app — Claude, ChatGPT, or any MCP client with remote connectors — safely read and write one GitHub repository, built for a second-brain / Obsidian vault stored on GitHub.

• One repo, hard-scoped. Every tool is pinned to a single configured owner/repo; no tool accepts an arbitrary owner, repo, or URL.
• Own OAuth server. The AI app authenticates via a real OAuth flow against a self-hosted login — no static tokens pasted into the UI.
• Single user or team. A member registry maps each login to that member's own fine-grained GitHub PAT, so commits are attributed to the right person. A single user is just a one-member roster.
• Safe by construction. GitHub PATs are server-side only (never sent to the AI app); writes go directly to main, full-file only, with no delete and a 100 KB size cap.

Tools: github_repo_info, github_list_tree, github_read_file, github_list_directory, github_search_notes, github_list_issues, github_list_pull_requests, and github_write_file.

Run locally

cp .env.example .env
# edit .env — each variable is documented inline

uv sync
uv run python server.py

Then validate the OAuth gate and connect it to your AI app (Claude, ChatGPT, …) following docs/connector-setup.md. The auth and security model is described in docs/security-notes.md.

Configure

All configuration is via environment variables (see .env.example):

• MCP_PUBLIC_BASE_URL / OAUTH_ISSUER_URL — the server's own public URL.
• TEAM_MEMBER_IDS + a MEMBER_<ID>_* block per member — the roster. One entry for single-user, several for a team.
• GITHUB_ALLOWED_OWNER / GITHUB_ALLOWED_REPO — the one repo everyone reads and writes.
• MCP_SERVER_NAME (optional) — the name this instance reports (login page, ping). Defaults to second-brain-github-mcp.

Deploy

The app builds from the included Dockerfile and runs on any Docker host (e.g. DigitalOcean App Platform, or a VPS via docker compose). Set every variable from .env.example as an encrypted platform env var — never upload a .env file — and set the public-URL vars to the real assigned URL. The server reads env only at startup, so redeploy after any change (PAT rotation, new member, URL). Full steps are in the connector-setup doc.

Tests

uv run pytest

Requirements

• Python 3.12+, managed with uv.
• Built on the official MCP Python SDK (FastMCP, Streamable HTTP transport).

License

MIT