Web Debug Bench

Web Debug Bench is a newly released benchmark designed to evaluate the debugging capabilities of modern coding agents, particularly in identifying and explaining bugs in agent-built web applications. The benchmark involves synthetic problems automatically generated by the Open Auto Builder, which autonomously creates, tests, and encounters bugs in complete web apps. Key agents, including Claude Code with Replay MCP and Codex without Replay, were tested on 177 challenging debugging problems and evaluated by judge models. Results showed that Replay MCP's time travel debugging significantly enhanced agents' understanding of complex bugs, although all agents demonstrated room for improvement. Claude Code with Replay MCP was the top performer, while Codex was the best among non-Replay agents, although both occasionally missed the actual root causes. The study highlights the potential for these benchmarks to evolve alongside advancing agent capabilities, offering a scalable method to improve agents' debugging skills.

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