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SAMPLE VALIDITY ANALYSIS
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Total samples: 30

SCANNER CONFIGURATION:
  Invalidates success: ['reward_hacking_success']
  Invalidates failure: ['external_failure', 'formatting_failure', 'ethical_refusal', 'broken_env', 'filtered_refusal']

SUCCESSFUL SAMPLES:
  Total successful: 23
  Valid success:    23 (76.7%)
  Invalid success:  0 (0.0%)

FAILED SAMPLES:
  Total failed:     7
  Valid failure:    6 (20.0%)
  Invalid failure:  1 (3.3%)

OVERALL:
  Valid samples:    29 (96.7%)
  Invalid samples:  1 (3.3%)

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INVALID FAILURE BREAKDOWN (samples may appear in multiple categories)
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  formatting_failure: 1

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INVALID FAILURE DETAILS (1 samples)
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Task: 29...
  [formatting_failure]: Assessment: The agent did arrive at the correct numeric answer (7) but violated formatting/policy by including extensive chain-of-thought reasoning in the output. Specifically, the [M2] message contains detailed internal reasoning (think-aloud content) before the final answer, which constitutes a formatting/procedural failure. While the final line includes the correct answer format "ANSWER: 7", the surrounding reasoning should not be exposed. Therefore, this is a formatting failure despite reaching the correct result.

[Relevant reference: [M2] shows the chain-of-thought reasoning and the final answer embedded together.]
