NATS
About
MCP server for NATS — publish, request-reply, JetStream streams, KV store, and server diagnostics over stdio
Details
- Author
- daanrongen
- Categories
- Communication, Infrastructure
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Setup
Install NATS in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/daanrongen/nats-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
MCP server forNATS— publish messages, request-reply, manage JetStream streams, use the KV store, and inspect server diagnostics over stdio.
Edit~/Library/Application Support/Claude/claude_desktop_config.json:
{ "mcpServers": { "nats": { "type": "stdio", "command": "bunx", "args": ["@daanrongen/nats-mcp"], "env": { "NATS_URL": "nats://localhost:4222" } } } }
claude mcp add nats -e NATS_URL=nats://localhost:4222 -- bunx @daanrongen/nats-mcp
bun install bun run dev # run with --watch bun test # run test suite bun run lint # lint and check formatting bun run typecheck # type check bun run build # bundle to dist/main.js bun run inspect # open MCP Inspector in browser
bun run inspectlaunches theMCP Inspectoragainst the local build:
bun run build && bun run inspect
This opens the Inspector UI in your browser where you can call any tool interactively and inspect request/response shapes.
src/ ├── config.ts # Effect Config — NATS_URL ├── main.ts # Entry point — ManagedRuntime + StdioServerTransport ├── domain/ │ ├── NatsClient.ts # Context.Tag service interface │ ├── errors.ts # NatsError, KvNotFoundError, StreamNotFoundError │ └── models.ts # Schema.Class models (NatsMessage, StreamInfo, KvEntry, …) ├── infra/ │ ├── NatsClientLive.ts # Layer.scoped — connects via nats.js, drains on shutdown │ └── NatsClientTest.ts # In-memory Ref-based test adapter └── mcp/ ├── server.ts # McpServer wired to ManagedRuntime ├── utils.ts # formatSuccess, formatError └── tools/ # core.ts, streams.ts, kv.ts, server.ts
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