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nats-trail

v0.5.0

Published

Agent-native observability for NATS and JetStream: CLI, MCP server and web UI.

Vulnerabilities

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  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

solsolettisolsoletti

Keywords

natsjetstreammcpobservabilitydebuggingcliagent

Readme

nats-trail

Agent-native observability for NATS and JetStream. A web UI, a CLI and an MCP server over one bounded query engine, so humans and agents debug the same event bus from the same source of truth.

npx nats-trail serve      # UI + API on http://127.0.0.1:4000
npx nats-trail trace --request-id req-8f21c --limit 20

Why

Every NATS GUI answers "what is in this stream?". The hard question is "why did this one flow fail?" — following a single request_id across four streams and a dead-letter subject. NATS Trail answers that, and exposes the answer to agents as a typed, bounded, read-only tool contract.

The agent surface is read-only by construction

executeMcpTool() receives an interface that exposes only read functions. There is no disabled publish behind a feature flag — there is no publish to call. A misconfigured environment variable cannot purge your production stream, because the code path does not exist.

That is the only reason it is reasonable to hand an agent a prod context.

Commands

serve            Start the API bridge and the web UI
contexts list    List configured contexts
streams list     List JetStream streams
messages search  Search messages through the Query Engine
trace            Trace by --request-id or --correlation-id
dlq search       Search dead-letter messages
mcp run <tool>   Run an MCP tool contract

Run without arguments for an interactive shell, or nats-trail help for the full list.

Full documentation: https://github.com/solsolettidev/nats-trail

License

Apache-2.0