Read-only MCP server for Calibre: metadata, BM25 full-text search over EPUB/PDF/MOBI/LIT, chapter/page reading, highlights. Direct SQLite (works with Calibre open), incremental FTS5 index, stdio + Str
A read-only MCP server that gives Claude, ChatGPT, Codex and any other MCP client native access to a local Calibre library. It reads Calibre's own databases directly (no Calibre process, no write access), and adds:
- search by metadata (with Calibre's own search syntax), by exact words (full-text, BM25), and by meaning (multilingual hybrid semantic search, opt-in); - reading by offset, chapter, EPUB section or PDF page, with a chapter map for every format, LIT and MOBI included; - images: covers and figures listed, searched by caption, and shown inline in the chat with Copy/Save PNG; - curation: a metadata quality report, duplicates with field-by-field comparison, ISBNs found in the text; - notes from books: companion skills to distill a book or a topic, and a legal gate that checks the notes do not reproduce the sources.
Transports: stdio (Claude Desktop, ChatGPT desktop app, Codex) and Streamable HTTP (Claude Code, Codex, other clients, remote use).
Visual overview of the core server (read-only access, sidecar full-text index, extraction chain, transports). The Architecture section below is the precise, current reference, including the semantic and figure indexes added in 5.0.
Goal Example request Tools involved --------- Find books "my unread security books published after 2020" calibresearchbooks (query: 'tag:security and not letto:true and pubdate:2020') Find where something is discussed "which books explain prompt injection?" calibresearchfulltext, calibresearchsemantic Read "read chapter 3 of 1168", "show the table of contents" calibregetchapters, calibrereadtext
From the project README.
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