llm-agentspec is an open-source CLI tool that provides pytest-style behavioral contract testing for LLM agent tool-call sequences. It helps developers validate and ensure the reliability of agent workflows by automating behavioral checks.
llm-agentspec is an Agent evaluation & testing project. It focuses on ensuring LLM agent tool-call sequences meet behavioral contracts for reliability and correctness. It is built as an open-source project for AI agent developers and testers. llm-agentspec is open source under the MIT license. It runs on the command line.
llm-agentspec first shipped in 2026. The project is developed in the open on GitHub with 18 commits in the last 90 days. Key capabilities include behavioral contract testing, LLM agent tool-call validation, and pytest-style interface.
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