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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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A KeyError raised inside an existing tool is currently reported as Tool not found, hiding the actual failure and misleading the next agent turn. Separate tool lookup from execution, preserving the missing-tool message and reporting execution exceptions through the existing error path.
Validation:
PYTHONPATH=agents python -m pytest tests/agents/test_tool_keyerror_diagnostics.py -q(3 passed in 0.01s). The regression tests fail on the unchanged main branch. Tests use local fixtures; no paid API calls.Prepared with Codex assistance; the final diff and regression behavior were checked locally.