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@cyanheads/noaa-marine-mcp-server

Find NOAA tide stations and NDBC buoys, fetch tide predictions, water levels, tidal currents, and live buoy conditions via MCP. STDIO or Streamable HTTP.\n

5 Tools • 1 Resource

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\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/noaa-marine-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^1.29.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/noaa-marine-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/noaa-marine-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-^6.0.3-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.3.11-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/noaa-marine-mcp-server/releases/latest/download/noaa-marine-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=noaa-marine-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvbm9hYS1tYXJpbmUtbWNwLXNlcnZlciJdfQ==) [![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%22noaa-marine-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fnoaa-marine-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://noaa-marine.caseyjhand.com/mcp](https://noaa-marine.caseyjhand.com/mcp)\n\n

\n\n---\n\n## Tools\n\nFive tools covering the full US marine operational workflow — station discovery, tide predictions, observed water levels, tidal current predictions, and live offshore buoy conditions:\n\n| Tool | Description |\n|:-----|:------------|\n| `noaa_marine_find_stations` | Find CO-OPS tide/water-level/current stations and NDBC buoys near a location or by name/state. Required first step to resolve place names or coordinates to station IDs. |\n| `noaa_marine_get_tide_predictions` | High/low tide predictions for a CO-OPS tide station over a date range. Supports 6-minute interval output and multiple datums (defaults to MLLW — US nautical chart standard). |\n| `noaa_marine_get_water_level` | Observed water level (real-time or historical) for a CO-OPS station, paired with predictions to compute storm surge or anomalous drawdown. |\n| `noaa_marine_get_currents` | Tidal current predictions for a CO-OPS current station: max flood/ebb speeds, slack times, and directions. Defaults to MAX_SLACK (practical passage-planning view). |\n| `noaa_marine_get_conditions` | Live marine conditions from an NDBC buoy: wave height/period/direction, wind, sea-surface temp, air temp, and barometric pressure. |\n\n### `noaa_marine_find_stations`\n\nUnified station discovery across CO-OPS (3,450+ tide/water-level stations, 4,430+ current stations) and NDBC (1,354+ active buoys worldwide).\n\n- Filter by proximity (latitude/longitude + radius), name substring, state/territory, source (CO-OPS vs NDBC), or type (tide, current, water_level, buoy, met)\n- Returns unified station list with source, type, capabilities, coordinates, and distance\n- Station lists are cached in-memory (6-hour TTL) — first call after startup may be slightly slower\n- Required first step: CO-OPS and NDBC use non-overlapping ID systems; guessing a station ID reliably fails\n\n---\n\n### `noaa_marine_get_tide_predictions`\n\nCO-OPS MLLW tide predictions for planning tidal windows.\n\n- High/low events (default) or 6-minute continuous curve\n- Eight datums: MLLW (default, US nautical chart), MHHW, MSL, MTL, MHW, MLW, CD, STND\n- Time zone options: local standard/daylight (default), GMT, local standard only\n- Units: English (feet, default) or metric (meters)\n- Maximum date range: 1 year per request (typed error `date_range_exceeded` for longer ranges)\n\n---\n\n### `noaa_marine_get_water_level`\n\nObserved water level vs. predicted — the storm surge view.\n\n- 6-minute observed water level readings with quality flags\n- Paired tide predictions fetched in parallel (failure degrades gracefully — observed levels still returned)\n- Optional residual summary: max surge and max drawdown when both series are present\n- Maximum date range: 31 days per request for 6-minute data\n\n---\n\n### `noaa_marine_get_currents`\n\nCO-OPS tidal current predictions for passage planning.\n\n- MAX_SLACK interval (default): max flood, max ebb, and slack events only — the actionable view for transiting inlets and channels\n- 6-minute interval: full continuous current curve for charting or integration\n- Current station IDs use alphanumeric format (e.g., `ACT4176`), distinct from numeric tide station IDs — use `find_stations` with `types: [\"current\"]` to discover them\n\n---\n\n### `noaa_marine_get_conditions`\n\nLive NDBC buoy observations (most recent ~45 days, updated every 10 minutes).\n\n- Wave height (m), dominant and average period (sec), mean wave direction\n- Wind speed and gust (m/s), wind direction\n- Sea-surface temperature, air temperature, dew point (°C)\n- Barometric pressure (hPa)\n- All sensor fields nullable (`null` when buoy sensor did not report — normal for offshore buoys)\n- All values in SI units except `TIDE` (feet) and `VIS` (nautical miles), which are rarely populated at offshore buoys\n\n## Resources and prompts\n\n| Type | Name | Description |\n|:-----|:-----|:------------|\n| Resource | `noaa-marine://station/{station_id}` | Metadata for a CO-OPS or NDBC station by ID: name, coordinates, source, capabilities, and state. |\n\nAll resource data is also reachable via tools. Use `noaa_marine_find_stations` to discover station IDs before accessing the resource.\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core):\n\n- Declarative tool and resource definitions — single file per primitive, framework handles registration and validation\n- Unified error handling — handlers throw, framework catches, classifies, and formats with typed error contracts\n- Structured logging with optional OpenTelemetry tracing\n- STDIO and Streamable HTTP transports\n- Pluggable auth: `none`, `jwt`, `oauth`\n\nNOAA-specific:\n\n- In-memory station cache (6-hour TTL) for CO-OPS and NDBC station lists — discovery is fast after first startup\n- CO-OPS and NDBC integrated in a unified station model — `find_stations` fans out across both sources in parallel\n- NDBC fixed-width text parser: `MM` (missing sensor data) normalized to `null`, not passed through as strings\n- Paired water-level + prediction fetches for storm surge residual computation\n- CO-OPS `application=` courtesy parameter sent on every request (configurable via `NOAA_APPLICATION_ID`)\n\nAgent-friendly output:\n\n- Datum echoed on every tide/water-level response — agents can state units and reference correctly without assumptions\n- `total_found` on `find_stations` shows count before `limit` slice so agents know whether to re-query\n- All NDBC sensor fields explicitly nullable with per-field unit documentation — agents don't fabricate missing readings\n- Typed station source (`coops` | `ndbc`) and type fields on every station record — agents can branch on data, not string parsing\n\n## Getting started\n\nNo API key required. Both NOAA CO-OPS and NDBC are open, keyless data sources.\n\n### Public Hosted Instance\n\nConnect directly via Streamable HTTP — no install, no API key:\n\n```json\n{\n \"mcpServers\": {\n \"noaa-marine\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://noaa-marine.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-hosted / local\n\nAdd the following to your MCP client configuration file:\n\n```json\n{\n \"mcpServers\": {\n \"noaa-marine\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/noaa-marine-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 \"noaa-marine\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/noaa-marine-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 \"noaa-marine\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"ghcr.io/cyanheads/noaa-marine-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 v1.3.11](https://bun.sh/) or higher (or Node.js v24+).\n- No external API keys needed — NOAA CO-OPS and NDBC are fully open.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/noaa-marine-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd noaa-marine-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 needed (all vars optional)\n```\n\n## Configuration\n\n| Variable | Description | Default |\n|:---------|:------------|:--------|\n| `NOAA_APPLICATION_ID` | Courtesy identifier sent as `application=` on CO-OPS requests. | `noaa-marine-mcp-server` |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\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| `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/noaa-marine-mcp-server/blob/main/.env.example) for the full list of optional overrides.\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n bun run rebuild\n\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 noaa-marine-mcp-server .\ndocker run --rm -p 3010:3010 noaa-marine-mcp-server\n```\n\nThe Dockerfile defaults to HTTP transport, stateless session mode, and logs to `/var/log/noaa-marine-mcp-server`. OpenTelemetry peer dependencies are installed by default — build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n## Project structure\n\n| Path | Purpose |\n|:-----|:--------|\n| `src/index.ts` | `createApp()` entry point — registers tools, resource, and initializes services. |\n| `src/config/` | `NOAA_APPLICATION_ID` env var parsing with Zod. |\n| `src/services/coops/` | CO-OPS Tides & Currents API client: station list cache, data fetch, error detection. |\n| `src/services/ndbc/` | NDBC buoy service: active stations XML parser, realtime text parser. |\n| `src/mcp-server/tools/` | Five tool definitions (`*.tool.ts`). |\n| `src/mcp-server/resources/` | Station metadata resource (`noaa-marine-station.resource.ts`). |\n| `tests/` | Vitest tests mirroring `src/`. |\n| `docs/` | Design doc and directory tree. |\n\n## Development guide\n\nSee [`CLAUDE.md`/`AGENTS.md`](https://github.com/cyanheads/noaa-marine-mcp-server/blob/main/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 request-scoped logging\n- Register tools and resources in `src/index.ts` directly (no barrels for this server)\n- Wrap external API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields\n- NDBC `MM` values must normalize to `null`, not be passed through as strings\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\nApache-2.0 — see [LICENSE](https://github.com/cyanheads/noaa-marine-mcp-server/blob/main/LICENSE) for details.\n","changelogMarkdown","videoKey","requiredSecretsJson","publishedAt","priceCents","trialDays",0,"categoryDisplayName","Developer Tools","upstream",{"_95":96,"_97":98,"_99":100,"_101":102,"_103":104},"requiredSecrets",[],"tags",[],"assets",[],"stats",{"_93":80,"_94":80},"ratingAvg","reviewCount","topics",[105,106,107,19,108,109,110,111,112,113,114,115],"license","Apache-2.0","language","TypeScript","registryName","io.github.cyanheads/noaa-marine-mcp-server","homepage","https://www.npmjs.com/package/@cyanheads/noaa-marine-mcp-server","ai-agents","ai-tools","buoy","marine","mcp","mcp-server","model-context-protocol","noaa","oceanography","tides","typescript","ENV",{"_118":119,"_120":121,"_122":123},"ENVIRONMENT","production","TURNSTILE_SITE_KEY","0x4AAAAAAB8-rEI2gNDf_QhU","SENTRY_DSN","https://45fd1229f78089d5c3ee78be128030e1@o4510583261757440.ingest.de.sentry.io/4510584253448272"]