Librarian MCP Server

Turn any ebook into clean, token-counted Markdown chapters - let Claude read your bookshelf over MCP and catch it misquoting your books. Deterministic RAG: no embeddings, no network, no API keys. It runs locally over stdio via the published package.

People who work with ebooks, epub and fb2 and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-01 · ★ 2 · #58 OF 106 MAINTAINED AI & ML · VERIFIED 2026-09-18

MIT · Python servers · how we verify → /methodology

01 · Install Librarian

before you install - you'll need

LIB_HOME is optional or environment-specific per the README.

Claude Code

claude mcp add terobyte-librarian-cli -- uvx librarian-cli

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "terobyte-librarian-cli": {
      "command": "uvx",
      "args": [
        "librarian-cli"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

pypi package librarian-cli - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.Terobyte is GitHub-verified and matches the repo owner

03 · What Librarian can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Limitations (from the README)

- PDF: works well on typographically normal books; complex layouts may land in review. - DRM is not circumvented; source legality is the user's responsibility. - Networked filesystems (NFS/SMB) are not supported (the advisory lock isn't reliable there). - MOBI/DJVU and text-less scans are not supported (v3 candidates: OCR, calibre). - CLI messages are currently in Russian; English output is planned. - lib verify: quo

Latest releases

v0.2.0 · 2026-09-01

lib verify "quote" [--book ID] [--json] [--limit N]: catches misquoted book text, · deterministically, no LLM. Book mode (--book) does a full scan of one book; shelf mode · (no --book) attributes the quote across the…

v0.1.0 · 2026-07-08

Deterministic pipeline turning FB2, EPUB, DOCX, HTML, TXT/MD, and text-layer PDF into · clean, token-counted Markdown chapters - byte-identical output for identical input. · Quality gate: five metrics (coverage…

04 · Who maintains Librarian

Librarian is maintained by terobyte. It's the only MCP server we track from this author; the repo dates to Jul 2026.

05 · Facts

repository: github.com/terobyte/librarian-cli
category: AI & ML - ranked #58 of 106 actively-maintained AI & ML servers as of 2026-09-18.
release cadence: 2 releases in the last 90 days (latest 2026-09-01)
registry: io.github.Terobyte/librarian (active, first published 2026-07-08)
packages: pypi:librarian-cli

06 · Librarian FAQ

What is Librarian?

Is Librarian still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-01 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Librarian?

Run `uvx librarian-cli`. The README documents one environment variable (LIB_HOME) to set first. LIB_HOME is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does Librarian run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Librarian

Alternatives to Librarian

Maintained AI & ML servers if Librarian isn't the fit.

Pairs well with

Servers that cover what Librarian doesn't - only shown when the pairing reason fits the companion.

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