AstroMesh Compass MCP

Minimal production-quality Node.js MCP-style JSON-RPC server for the Battle of the Minds AstroMesh puzzle.

The server exposes five AstroMesh tools over HTTP JSON-RPC 2.0 and is designed to deploy cleanly on Render.com.

Runtime

• Node.js 18 or newer.

• Express HTTP server.

• Native Node fetch; node-fetch is included as a dependency per package requirements but is not imported.

• Server-side .env loading via dotenv.

Related MCP server: Astro MCP Server

Endpoints

GET /

Landing page with:

• Server name and version.

• Endpoint list.

• Tool list.

• Environment status showing whether ASTROLOGY_API_KEY is set.

• No secret values.

GET /health

Returns health JSON with ok/version/tools/uptime/env_status.

GET /tools

Returns a JSON array of all five tools with input_schema.

POST /mcp

Primary JSON-RPC 2.0 endpoint. Methods: server/info, tools/list, tools/describe, tools/call.

GET /mcp

Browser-friendly JSON-RPC testing endpoint.

Tools

1. astrology_natal_chart - Free Astrology API

2. astrology_sun_sign - Free Astology API

3. astro_market_pulse - Free Astrology + CoinGecko

4. astro_weather - Free Astrology + Open-Meteo

5. celestial_conditions - All four in parallel via Promise.allSettled

Upstream timeout

Each upstream call uses an 8 second timeout through AbortController.

JSON-RPC errors

• -32700 parse error.

• -32601 method not found.

• -32602 invalid params.

• -32603 internal error.

Local development

Install: npm install. Copy .env.exampleto.env, edit, then npm start`.

Render deployment

Option A: Blueprint - push to GitHub, New + Blueprint in Render, select repo, add astrology_api_key env.

Option B: Manual Web Service - runtime Node, build npm install, start npm start, env astrology_api_key.

Security note

astrology_api_key is server-side only. Never browser-visible.

CORS

CORS enabled with Access-Control-Allow-Origin: *.