[HN] Show HN: ToolGuard – Pytest for AI agent tool calls

Summary

ToolGuard is a new Python tool designed to enhance the reliability of AI agents by rigorously testing their tool calls. It addresses common issues where LLMs hallucinate JSON keys or pass incorrect data types, which often cause agents to crash. ToolGuard fuzzes Python tool functions with various edge cases, generating a Pydantic schema from type hints to deterministically identify vulnerabilities and provide a reliability score without needing an LLM for testing.

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