A policy-aware MCP server for an org-wide knowledge brain that lives in a git repo.
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Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"brein-mcp","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
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<p align="center"> <a href="https://brein.sh"><img src="assets/brain.gif" alt="brein" width="320"></a> </p> <h1 align="center">brein</h1> <p align="center"><em>a brain that lives in your company.</em></p> brein is a local MCP server for a company memory that lives in git: markdown docs in your repo, readable and writable by AI agents. Works with Claude Code, Cursor, Codex, Hermes, and any stdio MCP client. Website: https://brein.sh ## Quickstart ```bash npx brein init ``` Walks you through the brain repo, paths, eval, and MCP client config. Then restart your client and verify with `brein doctor`. Requirements: Node, Python 3.11+, `git`, an MCP-capable client. <details><summary>From source</summary> ```bash git clone https://github.com/brein-sh/brein && cd brein uv sync brein setup brein mcp claude ``` </details> ## CLI ```bash brein setup [section] # all sections, or one of: repo paths vector eval mcp brein doctor # ok/warn/fail health checks brein mcp <client> # claude | cursor | codex | generic brein config # show resolved config brain-eval --limit 20 # local retrieval evals against $BRAIN_REPO ``` ## Tools exposed over MCP | Tool | Purpose | | --- | --- | | `brain_search(query, mode="hybrid")` | Keyword / vector / hybrid retrieval with optional rerank. | | `brain_evidence(question)` | Ranked docs + snippets + excerpts + citations in one round-trip. The client agent writes the final answer. | | `brain_update(file_path, content, commit_message, mode)` | Write to an allowed path, validate, commit, push. | | `brain_audit()` | Repo cleanliness, doc/frontmatter counts, log + index health. | | `brain_retrieval_log(...)` | Telemetry; search auto-logs. | For plain reads / listings, agents use their normal file tools (`Read`, `Glob`, `Grep`) against the brain repo directly — the MCP only mediates what plain tools can't do: semantic search and policy-gated writes. Write policy: paths under `docs/`, `skills/`, `templates/`, …
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