# cyanheads-mcp-server [Health: Active]
**Category:** 💻 Developer Tools
**Repository:** https://github.com/cyanheads/cyanheads-mcp-server
**GitHub Stars:** 1
**Views:** 0
**Installs:** 0
**Upvotes:** 0
**Directory Page:** https://allmcps.com/mcp/cyanheads-mcp-server
## Description
Fleet discovery for the cyanheads MCP ecosystem — semantic search + install snippets.
## Claude Desktop Quick Installation
Install path detected from listing signals. Uses `bunx` (confidence: high):
```json
"mcpServers": {
"cyanheads-mcp-server": {
"command": "bunx",
"args": ["@cyanheads/cyanheads-mcp-server@latest"]
}
}
```
## Documentation & README
@cyanheads/cyanheads-mcp-server
Fleet discovery for the cyanheads MCP ecosystem — semantic search + install snippets.
2 Tools • 0 Resources • 0 Prompts
[](./CHANGELOG.md) [](./LICENSE) [](https://github.com/users/cyanheads/packages/container/package/cyanheads-mcp-server) [](https://modelcontextprotocol.io/) [](https://www.npmjs.com/package/@cyanheads/cyanheads-mcp-server) [](https://www.typescriptlang.org/) [](https://bun.sh/)
[](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)
[](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)
**Public Hosted Server:** [https://cyanheads.caseyjhand.com/mcp](https://cyanheads.caseyjhand.com/mcp)
---
## Tools
Two 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.
| Tool | Description |
|:---|:---|
| `cyanheads_search_catalog` | Search fleet tools and servers by natural-language query. Returns ranked matches with brief summaries and the owning server. |
| `cyanheads_describe_entry` | Return the connection URL and per-client install snippets for a named tool or server. |
### `cyanheads_search_catalog`
Semantic 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.
- `query` accepts 1-500 characters
- `scope: "tools"` (default) returns individual tool matches; `scope: "servers"` returns server-level matches
- `category` filter narrows to one of `research`, `government`, `public-data`, `utility`
- Configurable `limit` (1-20, default 5) and a server-side `SIMILARITY_FLOOR` threshold drop low-confidence hits
- Returns `score` (cosine similarity in [0, 1]) on every result for trust calibration
- `totalCount` reports the count above the floor before the limit was applied
---
### `cyanheads_describe_entry`
Resolve 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.
- For tools: returns the description and the owning server name
- 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**
- Each snippet carries a `transport` (`stdio` or `http`); env vars a local install needs are surfaced and scaffolded into the JSON configs
- `client` filter narrows snippets to one of `claude-code`, `codex`, `cursor`, `gemini`, `streamable-http`, `curl`; omit to return every client
- Discriminated output on `kind` — callers branch on data, not string parsing
## Features
Built on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core):
- Declarative tool definitions — single file per tool, framework handles registration and validation
- Unified error handling with typed error contracts and recovery hints
- Pluggable auth (`none`, `jwt`, `oauth`)
- Structured logging with optional OpenTelemetry tracing
- Runs locally over stdio or HTTP, with a hosted Streamable HTTP endpoint
Fleet-specific:
- Hourly background catalog refresh with atomic swap on `generatedAt` change — no restart needed when the fleet updates
- L2-normalized 256-dim Matryoshka-truncated vectors keep memory under 100KB for a 40-server fleet
- 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
- Discriminated `result.kind` and typed `installSnippets[].client` / `installSnippets[].transport` enums — agents can branch reliably
## What's in the fleet
100+ 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.
| Category | Examples |
|:--|:--|
| **Research** | arXiv, bioRxiv, ORCID, Crossref, Wikipedia, Wikidata, OpenLibrary |
| **Government** | OpenStates, USAspending, CourtListener, NIST NVD, Library of Congress |
| **Public Data** | Earthquake (USGS), NOAA Weather, GBIF Biodiversity, World Bank, WHO, Eurostat |
| **Utility** | OpenStreetMap geocoding, Reference Data (constants, timezones, units), WSDOT |
## Getting started
### Public Hosted Instance
A public instance is available at `https://cyanheads.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:
```json
{
"mcpServers": {
"cyanheads-mcp-server": {
"type": "streamable-http",
"url": "https://cyanheads.caseyjhand.com/mcp"
}
}
}
```
For Claude Code:
```sh
claude mcp add --transport http cyanheads https://cyanheads.caseyjhand.com/mcp
```
### Self-Hosted / Local
Add the following to your MCP client configuration file.
```json
{
"mcpServers": {
"cyanheads-mcp-server": {
"type": "stdio",
"command": "bunx",
"args": ["@cyanheads/cyanheads-mcp-server@latest"],
"env": {
"MCP_TRANSPORT_TYPE": "stdio",
"MCP_LOG_LEVEL": "info"
}
}
}
}
```
Or with npx (no Bun required):
```json
{
"mcpServers": {
"cyanheads-mcp-server": {
"type": "stdio",
"command": "npx",
"args": ["-y", "@cyanheads/cyanheads-mcp-server@latest"],
"env": {
"MCP_TRANSPORT_TYPE": "stdio",
"MCP_LOG_LEVEL": "info"
}
}
}
}
```
Or with Docker:
```json
{
"mcpServers": {
"cyanheads-mcp-server": {
"type": "stdio",
"command": "docker",
"args": ["run", "-i", "--rm", "-e", "MCP_TRANSPORT_TYPE=stdio", "ghcr.io/cyanheads/cyanheads-mcp-server:latest"]
}
}
}
```
For Streamable HTTP, set the transport and start the server:
```sh
MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http
# Server listens at http://localhost:3010/mcp
```
### Prerequisites
- [Bun v1.3.0](https://bun.sh/) or higher (or Node.js v24+).
### Installation
1. **Clone the repository:**
```sh
git clone https://github.com/cyanheads/cyanheads-mcp-server.git
```
2. **Navigate into the directory:**
```sh
cd cyanheads-mcp-server
```
3. **Install dependencies:**
```sh
bun install
```
## Configuration
All 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.
| Variable | Description | Default |
|:---|:---|:---|
| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http` | `stdio` |
| `MCP_HTTP_PORT` | HTTP server port | `3010` |
| `MCP_HTTP_HOST` | HTTP server bind host | `127.0.0.1` |
| `MCP_HTTP_ENDPOINT_PATH` | HTTP endpoint path where the MCP server is mounted | `/mcp` |
| `MCP_AUTH_MODE` | Authentication: `none`, `jwt`, or `oauth` | `none` |
| `MCP_LOG_LEVEL` | Log level (`debug`, `info`, `warning`, `error`, etc.) | `info` |
| `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` |
| `CATALOG_FETCH_TIMEOUT_MS` | Per-request timeout for fleet.json fetches in ms. Must be > 0. | `10000` |
| `CATALOG_REFRESH_SECONDS` | Background poll interval for fleet.json refresh. `0` disables; otherwise must be > 0. | `3600` |
| `EMBEDDING_MODEL_ID` | Hugging Face model id for query embedding. Must match `fleet.json.embeddingModel`. | `Snowflake/snowflake-arctic-embed-m-v1.5` |
| `SIMILARITY_FLOOR` | Cosine similarity cutoff for `cyanheads_search_catalog` results. Must be within `[0, 1]`. | `0.3` |
| `OTEL_ENABLED` | Enable OpenTelemetry | `false` |
To point at a different catalog, change `CATALOG_URL` to your own hosted JSON file. See [`docs/design.md`](https://github.com/cyanheads/cyanheads-mcp-server/blob/HEAD/docs/design.md) for the producer-side script and schema.
## Running the server
### Local development
- **Build and run the production version**:
```sh
# One-time build
bun run rebuild
# Run the built server
bun run start:http
# or
bun run start:stdio
```
- **Run checks and tests**:
```sh
bun run devcheck # Lints, formats, type-checks, runs MCP and packaging linters
bun run test # Runs the test suite
```
## Project structure
| Directory | Purpose |
|:---|:---|
| `src/mcp-server/tools` | Tool definitions (`*.tool.ts`). Two tools — `cyanheads_search_catalog` and `cyanheads_describe_entry`. |
| `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). |
| `src/config` | Server-specific environment variable parsing and validation with Zod. |
| `tests/` | Unit and integration tests, mirroring the `src/` structure. |
| `docs/` | Design doc and schema reference. |
## Development guide
See [`CLAUDE.md`](https://github.com/cyanheads/cyanheads-mcp-server/blob/HEAD/CLAUDE.md) for development guidelines and architectural rules. The short version:
- Handlers throw, framework catches — no `try/catch` in tool logic
- Use `ctx.log` for logging, `ctx.state` for storage
- Register new tools in the `tools` array passed to `createApp()` in `src/index.ts`
## Contributing
Issues and pull requests are welcome. Run checks and tests before submitting:
```sh
bun run devcheck
bun run test
```
## License
This project is licensed under the Apache 2.0 License. See the [LICENSE](https://github.com/cyanheads/cyanheads-mcp-server/blob/HEAD/LICENSE) file for details.