Single tool with minimal definition quality. Tool name 'minimize_failure' lacks action verb clarity (should be 'minimize_*' or 'run_delta_debug'). Description is 56 chars, below the 194-char baseline for production tools. Input schema present but lacks parameter descriptions, 'elements' and 'target_elements' have no guidance on expected content, format, or constraints. No output schema documented. No error handling guidance. Tool definition is visible in code but lacks LLM-optimization for parameter inference.

• Add parameter descriptions: 'elements' → 'Array of items to minimize (e.g., tokens, lines, config directives). Must trigger failure when passed to test function.' 'target_elements' → 'Subset of elements that must remain in the minimal result. Used to define the failure condition.'
• Document output schema in tool description: 'Returns {minimal_elements: array, initial_size: int, minimized_size: int, steps: int, reduction_percentage: string}'
• Expand tool description to 150+ chars: 'Minimize a failing input using delta debugging (ddmin). Given a list of elements and a test function, finds the smallest subset that still reproduces the failure. Useful for reducing bug reports, test cases, or config errors.'
• Add error handling: catch ValueError and return structured error with guidance: '{error: "Input elements do not trigger failure initially. Verify test_func returns true for the full input.", recovery: "Check that target_elements are present in elements and test logic is correct."}'
• Rename tool to 'run_delta_debug' or 'minimize_test_input' for clarity. Ensure name reflects the action (run/minimize) and domain (delta debug/test input).