CrewAI 1.15.41 fails open on crashing pre-tool hooks

An analysis of five major AI agent frameworks reveals that CrewAI and the Claude Agent SDK fail open by default when a pre-tool hook encounters an exception, allowing the tool to execute anyway. The author tests how CrewAI, the Claude Agent SDK, LangChain, the OpenAI Agents SDK, and the MCP Python SDK handle crashing, hanging, or denying hooks against OWASP security guidelines for agentic applications. Open article →