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, plus the broader condition 'wants to stress-test a product concept').

Excellent coverage of natural trigger terms including multiple spelling variations ('pre-mortem', 'premortem', 'pre mortem'), related phrases ('risk analysis', 'what could go wrong', 'failure analysis', 'failure modes', 'stress premortem', 'investigate failure'), all of which a user would naturally say.

Highly distinctive niche: Gary Klein's pre-mortem methodology applied to product concepts. The specific methodology, output format (3 root causes across distinct failure dimensions), and extensive trigger terms make it very unlikely to conflict with other skills.

The skill is generally well-structured but includes some unnecessary explanation (e.g., explaining what a pre-mortem is and why it works, which Claude already knows). The prerequisites table and some of the methodology framing could be tightened. However, most content is functional and earns its place.

The skill provides highly concrete, step-by-step guidance with specific file paths, exact prompt templates for agent invocation, precise validation criteria (e.g., '4 distinct links, not 2 restated'), specific retry instructions, a defined output format with column schemas, and a complete user-facing 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 criteria), feedback loops (retry with adversarial instruction, then proceed with quality gap note), and error handling for multiple failure modes. The quality gate in Step 4 with a defined retry mechanism is exactly the kind of validation checkpoint the rubric rewards.

The skill references external files (premortem-protocol.md, premortem-report-template.md) and an agent (arn-spark-forensic-investigator), which is good progressive disclosure. However, no bundle files were provided to verify these references exist, and the SKILL.md itself is quite long (~150+ lines) with some content that could potentially be offloaded to reference files (e.g., the detailed agent invocation prompt template, the error handling scenarios).