Why it matters

Simulator shapes fast testing. Understanding shapes design.

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The architecture

Mock LLM responses.

Scripted tool outputs.

Run agent; assert on trajectory.

Agent simulator stackMock LLM + toolsscriptedRun agentagainst scriptsAsserttrajectory checksDeterministic tests catch integration bugs; complement with LLM-in-loop tests
Agent simulator.
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How it works end to end

Mock via LangChain4j / Spring AI mocks.

Scripts as test data.

Assert trajectory + final answer.