The body is lean and action-oriented without over-explaining known concepts, but Phase 3 duplicates two near-identical generate/verify blocks and the 'Example Workflow' recapitulates the three phases, so it could be tightened. It is not a 3 due to this redundancy, and not a 1 because it avoids padded conceptual explanation.

It provides a concrete shell command ('python your_script.py 2>&1 | head -100') and executable Python with real assertions, all copy-paste ready. It is not a 2 because the guidance is concrete and complete rather than pseudocode or abstract.

Three phases are clearly sequenced with explicit validation checkpoints ('assert os.path.exists') and a feedback loop (on failure → rerun → isolate → split → combine). It is not a 2 because validation and error-recovery steps are explicit, satisfying the batch/destructive-operations feedback-loop requirement.

No bundle files exist, so the skill is appropriately self-contained and organized into clear sections (Problem, Solution, phases, Example Workflow, Best Practices, When to Use) with no nested references. It is not a 2 because nothing that belongs in a separate file is inlined and navigation is straightforward.

The description lists three concrete actions — 'capturing partial traces, isolating failing functions, and incrementally verifying outputs' — matching the score-3 anchor of multiple specific concrete actions. It is not a 2 because the actions are concrete and enumerated rather than partial or abstract.

It clearly answers 'what' (debug execution failures via three named techniques) but the 'when' is only implied, with no explicit 'Use when...' clause. Per the judging guidelines a missing explicit trigger caps completeness at 2.

It includes 'Python code execution failures' but offers limited coverage of natural user phrasings and no explicit 'Use when...' trigger clause. It is not a 3 because common variations a user would actually say (e.g. 'sandbox failed', 'code execution error', 'execute_code_sandbox') are absent, and not a 1 because at least one relevant natural term is present.

'Python code execution failures' is somewhat specific but could overlap with generic debugging skills, and the distinctive niche (execute_code_sandbox failures) is not named in the description itself. It is not a 3 because the distinct trigger is not surfaced here, and not a 1 because it is more specific than 'Helps with code and documents'.