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@cyanheads/gutenberg-mcp-server

Search, browse, and read 75,000+ public-domain books from Project Gutenberg with full plain-text retrieval and offset/limit chunking via MCP. STDIO or Streamable HTTP.\n

4 Tools

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\n\n[![Version](https://img.shields.io/badge/Version-0.1.8-blue.svg?style=flat-square)](./CHANGELOG.md) [![License](https://img.shields.io/badge/License-Apache%202.0-orange.svg?style=flat-square)](./LICENSE) [![Docker](https://img.shields.io/badge/Docker-ghcr.io-2496ED?style=flat-square&logo=docker&logoColor=white)](https://github.com/users/cyanheads/packages/container/package/gutenberg-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^2.0.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/gutenberg-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/gutenberg-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-^7.0.2-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.4.0-blueviolet.svg?style=flat-square)](https://bun.sh/)\n\n

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\n\n[![Install in Claude Desktop](https://img.shields.io/badge/Install_in-Claude_Desktop-D97757?style=for-the-badge&logo=anthropic&logoColor=white)](https://github.com/cyanheads/gutenberg-mcp-server/releases/latest/download/gutenberg-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=gutenberg-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvZ3V0ZW5iZXJnLW1jcC1zZXJ2ZXIiXX0=) [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_Server-0098FF?style=for-the-badge&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22gutenberg-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fgutenberg-mcp-server%22%5D%7D)\n\n[![Framework](https://img.shields.io/badge/Built%20on-@cyanheads/mcp--ts--core-67E8F9?style=flat-square)](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)\n\n

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\n\n**Public Hosted Server:** [https://gutenberg.caseyjhand.com/mcp](https://gutenberg.caseyjhand.com/mcp)\n\n

\n\n---\n\n## Tools\n\nFour tools for searching and reading Project Gutenberg's public-domain library:\n\n| Tool | Description |\n|:-----|:------------|\n| `gutenberg_search_books` | Search the Gutenberg catalog by title, author, topic, language, or author lifespan — returns popularity-ordered results with IDs ready for follow-up calls |\n| `gutenberg_get_book` | Fetch complete metadata for a book by ID — full formats map, translators, editors, subjects, bookshelves, copyright status, and the `has_plain_text` flag |\n| `gutenberg_get_text` | Retrieve the plain-text content of a book, stripped of license boilerplate, with offset/limit chunking for context-budget management |\n| `gutenberg_browse_popular` | Browse the most-downloaded books, optionally filtered by language or topic — useful as a discovery entry point |\n\n### `gutenberg_search_books`\n\nSearch the Project Gutenberg catalog of 78,000+ public-domain books.\n\n- Full-text search against titles and author names (space-separated words, case-insensitive)\n- Topic filter matches subject headings and bookshelf categories\n- Language filter by ISO 639-1 two-character codes (e.g., `[\"en\"]`, `[\"fr\", \"de\"]`)\n- Author lifespan range filter via `author_year_start` / `author_year_end`\n- Sort by popularity (download count), or by Gutenberg ID ascending/descending\n- Batch lookup by known ID list via `ids` parameter\n- Paginated — up to 32 books per page; use `totalCount` to determine total pages\n- Each result includes `has_plain_text` to indicate whether `gutenberg_get_text` will work\n\n---\n\n### `gutenberg_get_book`\n\nFetch complete metadata for a single Project Gutenberg book.\n\n- Returns the full formats map (MIME type → download URL) including plain text, HTML, EPUB, and cover image\n- Includes translators and editors alongside authors, each with birth/death years\n- `has_plain_text` flag confirms whether a UTF-8 plain-text format is available\n- `media_type` distinguishes readable text books from audio recordings\n- Use this before `gutenberg_get_text` to confirm text availability and inspect the formats map\n\n---\n\n### `gutenberg_get_text`\n\nRetrieve the plain-text content of a Project Gutenberg book, stripped of license boilerplate.\n\n- Strips the standard Gutenberg license header and footer — response contains only the literary work\n- Offset/limit chunking for long works: novels routinely run 500 KB–2 MB; read in manageable chunks without loading the whole file\n- Response includes `totalChars`, `offset`, `length`, and `remainingChars` for precise pagination\n- Paragraph-boundary trimming: actual returned length may be slightly less than `limit` — use `length` (not `limit`) to compute the next offset\n- Prefers UTF-8 plain text; falls back to an HTML edition converted to text\n- Refuses audio books (`media_type \"Sound\"`) with a clear recovery hint\n- `provenance` field carries the Gutenberg ID, title, and license URL for attribution\n\n---\n\n### `gutenberg_browse_popular`\n\nBrowse the most-downloaded Project Gutenberg books.\n\n- Returns up to 32 titles ordered by download count (most popular first)\n- Optionally filter by language (ISO 639-1 codes) and/or topic keyword\n- Useful as a discovery entry point: \"what are the most popular classics in French?\"\n- `totalInCatalog` provides full context — \"top 20 of 60,000\"\n\n---\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core):\n\n- Declarative tool definitions — single file per tool, framework handles registration and validation\n- Unified error handling — handlers throw, framework catches, classifies, and formats with recovery hints\n- Pluggable auth: `none`, `jwt`, `oauth`\n- Swappable storage backends: `in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`\n- Structured logging with optional OpenTelemetry tracing\n- STDIO and Streamable HTTP transports\n\nProject Gutenberg integration:\n\n- Catalog search and metadata via [Gutendex](https://gutendex.com/) — an unofficial but stable JSON API over the Gutenberg dataset\n- Full plain-text retrieval from a Project Gutenberg content mirror (permits automated access) with transparent UTF-8/HTML fallback\n- Tenant-scoped text caching: book text is fetched once per tenant and served from cache for subsequent chunk reads\n- No API key required — Project Gutenberg data is freely available; no registration needed\n\nAgent-friendly output:\n\n- `has_plain_text` flag on every search/browse result so agents can pre-filter before attempting text retrieval\n- Precise chunking contract: `offset`, `length`, `totalChars`, `remainingChars`, `hasMore` on every `gutenberg_get_text` response for reliable sequential reads\n- `provenance` field on every text response for attribution\n- Discriminated `sourceFormat` field (`text/plain; charset=utf-8`, `text/html`) so agents know the fidelity of the text\n\n---\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://gutenberg.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"gutenberg-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://gutenberg.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-Hosted / Local\n\nNo API key required. Add the following to your MCP client configuration file:\n\n```json\n{\n \"mcpServers\": {\n \"gutenberg-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/gutenberg-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"gutenberg-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/gutenberg-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"gutenberg-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"ghcr.io/cyanheads/gutenberg-mcp-server:latest\"\n ]\n }\n }\n}\n```\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.3.0](https://bun.sh/) or higher (or Node.js v24+).\n- No API key required — Project Gutenberg data is freely available.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/gutenberg-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd gutenberg-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n4. **Configure environment:**\n\n```sh\ncp .env.example .env\n# edit .env if you need to override any defaults\n```\n\n---\n\n## Configuration\n\n| Variable | Description | Default |\n|:---------|:------------|:--------|\n| `GUTENDEX_BASE_URL` | Base URL for the Gutendex catalog API. Override for self-hosted instances. | `https://gutendex.com/books/` |\n| `GUTENBERG_TEXT_BASE_URL` | Base URL for a Project Gutenberg content mirror serving the `/cache/epub` file tree. Override to use a different mirror. | `https://gutenberg.pglaf.org` |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_SESSION_MODE` | HTTP session mode: `auto`, `stateful`, or `stateless`. The schema default `auto` resolves to stateful. | `stateless` |\n| `MCP_HTTP_PORT` | Port for HTTP server. | `3010` |\n| `MCP_AUTH_MODE` | Auth mode: `none`, `jwt`, or `oauth`. | `none` |\n| `MCP_LOG_LEVEL` | Log level (RFC 5424). | `info` |\n| `LOGS_DIR` | Directory for log files (Node.js only). | `/logs` |\n| `STORAGE_PROVIDER_TYPE` | Storage backend. | `in-memory` |\n| `OTEL_ENABLED` | Enable [OpenTelemetry instrumentation](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` |\n\nSee [`.env.example`](https://github.com/cyanheads/gutenberg-mcp-server/blob/main/.env.example) for the full list of optional overrides.\n\n---\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n # One-time build\n bun run rebuild\n\n # Run the built server\n bun run start:stdio\n # or\n bun run start:http\n ```\n\n- **Run checks and tests:**\n\n ```sh\n bun run devcheck # Lint, format, typecheck, security\n bun run test # Vitest test suite\n bun run lint:mcp # Validate MCP definitions against spec\n ```\n\n### Docker\n\n```sh\ndocker build -t gutenberg-mcp-server .\ndocker run --rm -p 3010:3010 gutenberg-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/gutenberg-mcp-server`. OpenTelemetry peer dependencies are installed by default — build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n---\n\n## Project structure\n\n| Path | Purpose |\n|:-----|:--------|\n| `src/index.ts` | `createApp()` entry point — registers tools and inits services. |\n| `src/config/server-config.ts` | Server-specific environment variable parsing (Gutendex and file-server URL overrides). |\n| `src/mcp-server/tools/definitions/` | Tool definitions (`*.tool.ts`). |\n| `src/services/gutendex/` | Gutendex catalog API client — search and book metadata. |\n| `src/services/gutenberg-text/` | Full plain-text retrieval, boilerplate stripping, tenant-scoped caching, and chunking. |\n| `tests/` | Unit and integration tests mirroring `src/`. |\n\n---\n\n## Development guide\n\nSee [`CLAUDE.md`](https://github.com/cyanheads/gutenberg-mcp-server/blob/main/CLAUDE.md) / [`AGENTS.md`](https://github.com/cyanheads/gutenberg-mcp-server/blob/main/AGENTS.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — no `try/catch` in tool logic\n- Use `ctx.log` for request-scoped logging, `ctx.state` for tenant-scoped storage\n- Register new tools via the entry arrays in `src/index.ts`\n- Wrap external API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields\n\n---\n\n## Contributing\n\nIssues and pull requests are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n---\n\n## License\n\nApache-2.0 — see [LICENSE](https://github.com/cyanheads/gutenberg-mcp-server/blob/main/LICENSE) for details.\n\nData from [Project Gutenberg](https://www.gutenberg.org/) is in the public domain. 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