agent-replay-py is an open-source Python package that enables developers to record and replay LLM API calls for deterministic agent testing. It integrates with pytest and supports cassette management, making it easier to test AI agent workflows reliably.
agent-replay-py is a Testing & QA product. It focuses on ensuring deterministic and repeatable tests for LLM-based agents by recording and replaying API calls. agent-replay-py is an open-source project aimed at python developers. The project is open source (MIT). The product ships for the command line.
It is developed by retr0hxx, and the product first shipped in 2026. The project is developed in the open on GitHub with 2 commits in the last 90 days. Among its 6 catalogued features are Record API calls, Replay API calls, and deterministic testing.
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