Lesson 1544 of 2116
Deterministic replay tests for non-deterministic AI agents
Pin model output via recorded fixtures so your CI catches behavior changes, not model jitter.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The premise
- 2replay testing
- 3fixtures
- 4determinism
Concept cluster
Terms to connect while reading
Section 1
The premise
You cannot test a stochastic agent the same way you test a function — but you can replay a recording.
What AI does well here
- Record real conversations and replay them in CI
- Diff tool-call sequences for regressions
What AI cannot do
- Catch novel failures the recording never saw
- Substitute for live evals on real users
Key terms in this lesson
End-of-lesson quiz
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