LLM-mock – Record real LLM API responses once, replay them in tests
Intercepts HTTP transport layer so production code needs zero changes.

No test scripts needed — it explores your app and catches what you forgot to test.
Frontend developers and QA engineers
Playwright · Cypress · Percy
Intercepts HTTP transport layer so production code needs zero changes.
Deterministic seeding creates byte-identical worlds—LangSmith can't reproduce failures like this.
Deterministic capture + replay for LLM agents is a practical, under-served problem and this repo actually ships a 'golden run' zip with cold‑run verification hashes — that’s the kind of evidence chain auditors want. The focus on portable evidence bundles and stress verification suggests useful forensics and load testing of agent logic, but the release page looks early-stage; I'd like to see integrations (tooling for popular agent frameworks), richer docs, and example pipelines before I'd evangelize it.
Replay-first architecture beats LangSmith's static traces for debugging non-deterministic agents.
Runtime clicks for you instead of waiting for user input like shepherd.js.
Postgres-only idempotency without Redis - clean alternative to Setnx patterns.