\n\n[](https://github.com/cyanheads/cyanheads-mcp-server/releases/latest/download/cyanheads-mcp-server.mcpb) [](https://cursor.com/en/install-mcp?name=cyanheads-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvY3lhbmhlYWRzLW1jcC1zZXJ2ZXIiXX0=) [](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22cyanheads-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads/cyanheads-mcp-server%22%5D%7D)\n\n[](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)\n\n
\n\n---\n\n## Tools\n\nTwo tools, semantic ranking, hosted catalog. The catalog itself lives at [`caseyjhand.com/fleet.json`](https://caseyjhand.com/fleet.json) — a single JSON file with baked embeddings, regenerated when servers are added or updated. This server polls it hourly and serves search out of an in-memory vector index.\n\n| Tool | Description |\n|:---|:---|\n| `cyanheads_search_catalog` | Search fleet tools and servers by natural-language query. Returns ranked matches with brief summaries and the owning server. |\n| `cyanheads_describe_entry` | Return the connection URL and per-client install snippets for a named tool or server. |\n\n### `cyanheads_search_catalog`\n\nSemantic search across the fleet. Embeds the query with [Snowflake Arctic Embed M v1.5](https://huggingface.co/Snowflake/snowflake-arctic-embed-m-v1.5) (Matryoshka-truncated to 256 dimensions) and computes cosine similarity against the catalog's pre-computed document vectors.\n\n- `query` accepts 1-500 characters\n- `scope: \"tools\"` (default) returns individual tool matches; `scope: \"servers\"` returns server-level matches\n- `category` filter narrows to one of `research`, `government`, `public-data`, `utility`\n- Configurable `limit` (1-20, default 5) and a server-side `SIMILARITY_FLOOR` threshold drop low-confidence hits\n- Returns `score` (cosine similarity in [0, 1]) on every result for trust calibration\n- `totalCount` reports the count above the floor before the limit was applied\n\n---\n\n### `cyanheads_describe_entry`\n\nResolve a name to its install instructions. Accepts either a tool name (snake_case, e.g. `earthquake_search`) or a server name (kebab-case, e.g. `earthquake-mcp-server`), up to 64 characters — auto-detected from the format, or pinned via the `kind` parameter.\n\n- For tools: returns the description and the owning server name\n- For servers: returns description, version, npm package, GitHub URL, the full tool list (each tool's name and description), and per-client install snippets — **local (stdio, via `npx`) for every server, plus remote (Streamable HTTP) when a hosted endpoint exists**\n- Each snippet carries a `transport` (`stdio` or `http`); env vars a local install needs are surfaced and scaffolded into the JSON configs\n- `client` filter narrows snippets to one of `claude-code`, `codex`, `cursor`, `gemini`, `streamable-http`, `curl`; omit to return every client\n- Discriminated output on `kind` — callers branch on data, not string parsing\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core):\n\n- Declarative tool definitions — single file per tool, framework handles registration and validation\n- Unified error handling with typed error contracts and recovery hints\n- Pluggable auth (`none`, `jwt`, `oauth`)\n- Structured logging with optional OpenTelemetry tracing\n- Runs locally over stdio or HTTP, with a hosted Streamable HTTP endpoint\n\nFleet-specific:\n\n- Hourly background catalog refresh with atomic swap on `generatedAt` change — no restart needed when the fleet updates\n- L2-normalized 256-dim Matryoshka-truncated vectors keep memory under 100KB for a 40-server fleet\n- Per-client install snippet generation at describe-time, not catalog-generation time — both local (stdio `npx`) and remote (Streamable HTTP) transports, kept in sync with the deployed endpoint\n- Discriminated `result.kind` and typed `installSnippets[].client` / `installSnippets[].transport` enums — agents can branch reliably\n\n## What's in the fleet\n\n100+ MCP servers spanning four categories. Each is open source and individually addressable — `cyanheads_describe_entry` returns its direct connection URL alongside the install snippet. It also describes this server: ask for `cyanheads-mcp-server` and you get the front door's own endpoint and install snippets.\n\n| Category | Examples |\n|:--|:--|\n| **Research** | arXiv, bioRxiv, ORCID, Crossref, Wikipedia, Wikidata, OpenLibrary |\n| **Government** | OpenStates, USAspending, CourtListener, NIST NVD, Library of Congress |\n| **Public Data** | Earthquake (USGS), NOAA Weather, GBIF Biodiversity, World Bank, WHO, Eurostat |\n| **Utility** | OpenStreetMap geocoding, Reference Data (constants, timezones, units), WSDOT |\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://cyanheads.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"cyanheads-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://cyanheads.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\nFor Claude Code:\n\n```sh\nclaude mcp add --transport http cyanheads https://cyanheads.caseyjhand.com/mcp\n```\n\n### Self-Hosted / Local\n\nAdd the following to your MCP client configuration file.\n\n```json\n{\n \"mcpServers\": {\n \"cyanheads-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/cyanheads-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 \"cyanheads-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/cyanheads-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 \"cyanheads-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\"run\", \"-i\", \"--rm\", \"-e\", \"MCP_TRANSPORT_TYPE=stdio\", \"ghcr.io/cyanheads/cyanheads-mcp-server:latest\"]\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\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/cyanheads-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd cyanheads-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n## Configuration\n\nAll configuration is validated at startup via Zod schemas in `src/config/server-config.ts`. Every variable has a sensible default — out of the box, the server points at the canonical cyanheads fleet.\n\n| Variable | Description | Default |\n|:---|:---|:---|\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http` | `stdio` |\n| `MCP_HTTP_PORT` | HTTP server port | `3010` |\n| `MCP_HTTP_HOST` | HTTP server bind host | `127.0.0.1` |\n| `MCP_HTTP_ENDPOINT_PATH` | HTTP endpoint path where the MCP server is mounted | `/mcp` |\n| `MCP_AUTH_MODE` | Authentication: `none`, `jwt`, or `oauth` | `none` |\n| `MCP_LOG_LEVEL` | Log level (`debug`, `info`, `warning`, `error`, etc.) | `info` |\n| `CATALOG_URL` | Remote fleet.json endpoint (schema v2 with baked embeddings). Must be an absolute URL. Override to front your own fleet. | `https://caseyjhand.com/fleet.json` |\n| `CATALOG_FETCH_TIMEOUT_MS` | Per-request timeout for fleet.json fetches in ms. Must be > 0. | `10000` |\n| `CATALOG_REFRESH_SECONDS` | Background poll interval for fleet.json refresh. `0` disables; otherwise must be > 0. | `3600` |\n| `EMBEDDING_MODEL_ID` | Hugging Face model id for query embedding. Must match `fleet.json.embeddingModel`. | `Snowflake/snowflake-arctic-embed-m-v1.5` |\n| `SIMILARITY_FLOOR` | Cosine similarity cutoff for `cyanheads_search_catalog` results. Must be within `[0, 1]`. | `0.3` |\n| `OTEL_ENABLED` | Enable OpenTelemetry | `false` |\n\nTo point at a different catalog, change `CATALOG_URL` to your own hosted JSON file. See [`docs/design.md`](./docs/design.md) for the producer-side script and schema.\n\n## Running the server\n\n### Local development\n\n- **Build and run the production version**:\n\n ```sh\n # One-time build\n bun run rebuild\n\n # Run the built server\n bun run start:http\n # or\n bun run start:stdio\n ```\n\n- **Run checks and tests**:\n ```sh\n bun run devcheck # Lints, formats, type-checks, runs MCP and packaging linters\n bun run test # Runs the test suite\n ```\n\n## Project structure\n\n| Directory | Purpose |\n|:---|:---|\n| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`). Two tools — `cyanheads_search_catalog` and `cyanheads_describe_entry`. |\n| `src/services/catalog` | Catalog service — remote fleet.json provider with atomic-swap refresh, vector index, snippet builders, the self-description fallback record, and the query-time embedding runtime (`@huggingface/transformers`, behind an injectable interface for deterministic tests). |\n| `src/config` | Server-specific environment variable parsing and validation with Zod. |\n| `tests/` | Unit and integration tests, mirroring the `src/` structure. |\n| `docs/` | Design doc and schema reference. |\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.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 logging, `ctx.state` for storage\n- Register new tools in the `tools` array passed to `createApp()` in `src/index.ts`\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## License\n\nThis project is licensed under the Apache 2.0 License. See the [LICENSE](./LICENSE) file for details.\n",
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