Lists multiple specific concrete actions: 'stress-test a product concept', 'identify hypothetical failure root causes, early warning signals, and mitigation strategies', 'Produces a pre-mortem report with 3 root causes across distinct failure dimensions and recommended concept updates.'

Clearly answers both 'what' (applies Gary Klein's pre-mortem methodology to identify failure root causes, early warning signals, and mitigation strategies; produces a report with 3 root causes) and 'when' (explicit trigger terms listed at the start with 'This skill should be used when...').

Excellent coverage of natural trigger terms including multiple variations: 'pre-mortem', 'premortem', 'pre mortem', 'risk analysis', 'stress premortem', 'failure analysis', 'what could go wrong', 'investigate failure', 'failure modes'. These are terms users would naturally say.

Highly distinctive niche: Gary Klein's pre-mortem methodology applied to product concepts. The specific trigger terms like 'pre-mortem', 'premortem', and 'failure modes' are unlikely to conflict with other skills, and the methodology reference further narrows the scope.

The skill is reasonably well-structured but includes some unnecessary explanation (e.g., explaining what a pre-mortem is and why it works, the optimism bias rationale). The data availability table and some of the contextual framing could be tightened. However, most content is functional and task-relevant.

The skill provides highly concrete, executable guidance: specific file paths, exact agent invocation context blocks, precise validation criteria (e.g., '4 distinct links, not 2 restated'), explicit retry prompts, a 6-column schema for recommendations, and a complete output summary template. Every step tells Claude exactly what to do.

The 6-step workflow is clearly sequenced with explicit validation checkpoints (Step 4 quality validation with specific rejection criteria and retry logic), error recovery paths (retry with adversarial instruction, fallback to best available output), and a clear feedback loop. The error handling section covers multiple failure modes with concrete recovery strategies.

The skill references external files (premortem-protocol.md, premortem-report-template.md, ensure-config.md) which is good progressive disclosure, but no bundle files were provided to verify these exist. The SKILL.md itself is quite long (~180 lines of substantive content) and some sections like the detailed agent context block and error handling could potentially be split into reference files. The references are clearly signaled but the main file carries a lot of inline detail.