MCP Servers

Librarian MCP Server

A local MCP server that gives AI agents structured access to a personal Obsidian knowledge vault, with semantic search, organization through Maps of Content, and git-backed history.

README

Librarian MCP Server

A local MCP server that gives AI agents structured access to a personal Obsidian knowledge vault. Notes remain portable Markdown, while Librarian enforces organization, provenance, deduplication, and git-backed history.

What it does

Stores OKF-compatible Markdown notes in a flat Obsidian vault.
Organizes concepts through Maps of Content (MOCs).
Combines local semantic search with lexical matching and exact filters.
Rejects duplicate concepts, invalid notes, and edits to immutable source notes.
Commits every mutation to the vault's git history.
Reports broken links, orphaned notes, malformed frontmatter, and WikiLinks.

All search and storage are local. The first semantic search downloads the BAAI/bge-small-en-v1.5 model (about 130 MB); later searches run offline.

Install

Requires Python 3.11+.

pip install .

Or with uv:

uv sync

Run

librarian --vault /path/to/vault

You can also set the vault path with LIBRARIAN_VAULT:

LIBRARIAN_VAULT=/path/to/vault librarian

On first run, Librarian creates the vault, initializes git, and adds a root MOC. Configure your MCP client to launch the server over stdio, for example:

{
  "mcpServers": {
    "librarian": {
      "command": "librarian",
      "args": ["--vault", "/path/to/vault"]
    }
  }
}

Tools

Tool	Purpose
`get_vault_seed`	Return a bounded overview of MOCs and recent notes
`query_knowledge`	Search notes semantically and lexically
`read_concept`	Read a complete note
`create_concept`	Create a validated note and wire it into an MOC
`enrich_concept`	Append content to a named section
`lint_graph`	Report graph and formatting problems

See spec.md for the full contracts and design decisions.

Development

uv sync --extra dev
uv run --extra dev pytest

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