MCP Master Tester 1.3 adds one-click smoke tests and CI checks for MCP servers
simplymanas · reddit · 2026-11-13
The open-source MCP Master Tester 1.3 (npx mcp-master-tester) is a lightweight local web UI for testing MCP servers, now with one-click smoke testing and CI integration.
- Point it at a stdio command or Streamable HTTP/SSE URL; it lists tools/resources/prompts, builds forms from schemas, and shows all JSON-RPC traffic
- New smoke test: calls every read-only tool once (only readOnlyHint: true unless overridden) and flags non-responders; args come from schema defaults/examples/enums
- Lint + smoke in CI: lint catches confusing tool names, missing descriptions, enum-able strings, undefined required fields; both fail the build with GitHub Actions annotations
- Lightweight: 2 runtime deps, 27 MB fresh install vs 100 MB for the official inspector, with a size-limit test
Security note: 1.2.1 fixed an XSS bug found during self-audit — a malicious server could run script in the tester's page via a tool schema. Update if you installed earlier versions.
MIT-licensed; no OAuth flow, sampling, or roots yet, so it doesn't replace the official inspector.
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