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\n

@cyanheads/guardian-mcp-server

\n

Search, browse, and retrieve full article text from The Guardian's journalism archive (1999–present) via MCP. STDIO or Streamable HTTP.\n

3 Tools
\n

\n
\n\n
\n\n[![Version](https://img.shields.io/badge/Version-0.1.4-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/guardian-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-%5E2.0.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/guardian-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/guardian-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-%5E7.0.2-3178C6.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
\n\n
\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/guardian-mcp-server/releases/latest/download/guardian-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=guardian-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvZ3VhcmRpYW4tbWNwLXNlcnZlciJdLCJlbnYiOnsiTUNQX1RSQU5TUE9SVF9UWVBFIjoic3RkaW8iLCJHVUFSRElBTl9BUElfS0VZIjoieW91ci1hcGkta2V5In19) [![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%22guardian-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fguardian-mcp-server%22%5D%2C%22env%22%3A%7B%22MCP_TRANSPORT_TYPE%22%3A%22stdio%22%2C%22GUARDIAN_API_KEY%22%3A%22your-api-key%22%7D%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
\n\n---\n\n## Overview\n\nThe Guardian's journalism archive (1999–present), via the Guardian Open Platform API. Search full text, browse by section or tag, and fetch complete untruncated articles from any MCP client. Runs as a stdio process or a local Streamable HTTP server.\n\n### Tools\n\n| Tool | Description |\n|:-----|:------------|\n| `guardian_search` | Full-text search across The Guardian's archive with optional section, tag, contributor, and date filters |\n| `guardian_get_article` | Fetch a single Guardian article by ID with full untruncated body text and metadata |\n| `guardian_browse` | Browse by section or tag, or discover available sections and tags, across four modes |\n\n---\n\n## Capability reference\n\n### `guardian_search` tool\n\n- Boolean query syntax (`AND`/`OR`/`NOT`, quoted phrases) plus optional `section`, `tag`, `contributor`, and `from_date`/`to_date` (`YYYY-MM-DD`) filters\n- Sort via `order_by`: `relevance` (default), `newest`, or `oldest`; paginated with `page` + `page_size` (1–50, default 10)\n- Body text is HTML-stripped and truncated at 2,000 words with a `truncated` flag — fetch the complete text via `guardian_get_article`\n- Typed error reasons: `unauthorized`, `no_results`, `invalid_date`, `api_error` (retryable)\n- Zero-result responses carry an enrichment notice echoing the query\n\n---\n\n### `guardian_get_article` tool\n\n- Input: `article_id` — the path-slug `id` field returned by `guardian_search` or `guardian_browse`\n- Returns complete untruncated body text (HTML stripped), full metadata, contributor list, and pillar/section classification\n- `truncated: true` means the body still exceeded 2,000 words after the full fetch\n- Typed error reasons: `unauthorized`, `not_found`, `api_error` (retryable)\n\n---\n\n### `guardian_browse` tool\n\n- Four modes via `mode`: `section_latest` (requires `section_id`), `tag_latest` (requires `tag_id`), `list_sections`, `list_tags`\n- `list_tags` takes optional `query` and `tag_type` (`keyword`, `contributor`, `blog`, `series`, `tone`, `type`, `publication`, `newspaper-book`, `newspaper-book-section`) — use `tag_type=contributor` to discover contributor IDs\n- Pagination via `page` + `page_size` (1–50, default 10) applies to every mode\n- Typed error reasons: `unauthorized`, `missing_section_id`, `missing_tag_id`, `section_not_found`, `tag_not_found`, `api_error` (retryable)\n\n---\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core): stdio and Streamable HTTP transports, pluggable auth (`none` / `jwt` / `oauth`), swappable storage (`in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`), structured logging with optional OpenTelemetry tracing.\n\nGuardian-specific:\n\n- Wraps the Guardian Open Platform API with a free non-commercial developer key\n- Full body text extraction — HTML stripped, not just headlines or abstracts\n- Contributor ID discovery via `guardian_browse` mode `list_tags` with `tag_type=contributor`\n- Section and tag taxonomy browsing (`list_sections`, `list_tags`) for filter discovery before searching\n- Free tier: 5,000 requests/day, 12 calls/second — the server applies no additional throttling\n\nAgent-friendly output:\n\n- Truncation flags on every article response — signal to call `guardian_get_article` for the rest\n- Typed error reasons across all three tools, each paired with a recovery hint\n- `total` / `page` / `pages` on every paginated response so callers can track result scope\n- Zero-result enrichment notice on `guardian_search` echoing the query and suggesting how to broaden\n\n---\n\n## Getting started\n\nAdd the following to your MCP client configuration file. Register for a free Guardian Open Platform API key at [open-platform.theguardian.com/access](https://open-platform.theguardian.com/access).\n\n```json\n{\n \"mcpServers\": {\n \"guardian-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/guardian-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\",\n \"GUARDIAN_API_KEY\": \"your-api-key\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"guardian-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/guardian-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"MCP_LOG_LEVEL\": \"info\",\n \"GUARDIAN_API_KEY\": \"your-api-key\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"guardian-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"-e\", \"GUARDIAN_API_KEY=your-api-key\",\n \"ghcr.io/cyanheads/guardian-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 GUARDIAN_API_KEY=your-api-key bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.4.0](https://bun.sh/) or higher (or Node.js v24+).\n- A free Guardian Open Platform API key — register at [open-platform.theguardian.com/access](https://open-platform.theguardian.com/access). The non-commercial developer tier is free and instant.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/guardian-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd guardian-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 and set GUARDIAN_API_KEY\n```\n\n---\n\n## Configuration\n\n| Variable | Description | Default |\n|:---------|:------------|:--------|\n| `GUARDIAN_API_KEY` | **Required.** Free developer key from [open-platform.theguardian.com/access](https://open-platform.theguardian.com/access). | — |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_HTTP_PORT` | Port for HTTP server. | `3010` |\n| `MCP_SESSION_MODE` | HTTP session mode: `stateless`, `stateful`, or `auto` (resolves to `stateful`). The server declares `stateless`; an exported value overrides it. | `stateless` |\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) (spans, metrics, completion logs). | `false` |\n\nSee [`.env.example`](./.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 guardian-mcp-server .\ndocker run --rm -e GUARDIAN_API_KEY=your-api-key -p 3010:3010 guardian-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/guardian-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| Directory | Purpose |\n|:----------|:--------|\n| `src/index.ts` | `createApp()` entry point — registers tools and initializes the Guardian service. |\n| `src/config` | Server-specific environment variable parsing (`GUARDIAN_API_KEY`). |\n| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`): `guardian_search`, `guardian_get_article`, `guardian_browse`. |\n| `src/services/guardian` | Guardian Open Platform API client, normalization, and type definitions. |\n| `tests/` | Unit and integration tests. |\n| `docs/` | Design document and directory tree. |\n\n---\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.md) / [`AGENTS.md`](./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 in the `createApp()` `tools` array 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 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](LICENSE) for details.\n\n---\n\n*Powered by [The Guardian](https://open-platform.theguardian.com/).*\n","readmeFilename":"README.md"}