tieline
Catches frontend–backend API drift before runtime by statically joining the HTTP calls your client makes (axios, RTK Query, Angular HttpClient) against the routes your server exposes (Express, NestJS, FastAPI, Spring, OpenAPI). Returns matched routes, drift (frontend calls a nonexistent backend route), unverifiable dynamic URLs, and unused backend routes. Runs deterministically in under a second with zero contract tests to write, making it a natural CI gate. The MCP wrapper gives Claude read access to the contract map so it can explain drift, suggest fixes, or audit API boundaries. Pair it with Pact if you need payload-level guarantees; tieline stops the 404s and method mismatches that slip through when specs and code diverge.
- tools
- 5
- transport
- STDIO
- last updated
- Jun 10, 2026
Tools
5 toolsPublic tool metadata for what this MCP can expose to an agent.
tieline_checktotals + `drift` + `unverifiable` (the drift gate)
totals + `drift` + `unverifiable` (the drift gate)
No parameter schema in public metadata yet.
tieline_listthe full resolved contract map
the full resolved contract map
No parameter schema in public metadata yet.
tieline_orphansbackend routes no frontend call reaches
backend routes no frontend call reaches
No parameter schema in public metadata yet.
tieline_doctor`undocumented` + `phantom` (code ↔ spec)
`undocumented` + `phantom` (code ↔ spec)
No parameter schema in public metadata yet.
tieline_initauto-detect nearby repos, write a config
auto-detect nearby repos, write a config
No parameter schema in public metadata yet.
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tieline
Static frontend↔backend contract-drift checker. Pact without writing a single contract test.
tieline demo
tieline reads the code you already wrote on both sides of an API boundary — the
HTTP calls your frontend makes and the routes your backend exposes — and tells you
where they disagree. No contract tests to author, no broker to run, no backend to
boot. It finishes in well under a second and is built to run in CI as a gate.
Details
- Repository
- github.com/nugehs/tieline
- Website
- github.com/nugehs/tieline#readme
- Package
@nugehs/tieline- Transport
- STDIO
- Registry
- MCP registry, active