Lists multiple specific concrete actions: capture the target, evidence, attempted fixes, ruled-out hypotheses, viable hypotheses, and next experiments. Also specifies the output format as a 'reusable investigation ledger'.

Clearly answers both what (compress debugging thread into a reusable investigation ledger capturing specific elements) and when (explicit 'Use when' clause plus 'Good triggers include' with concrete example phrases).

Includes natural trigger phrases users would actually say: 'compact this debugging session', 'summarize what we've tried', 'turn this into a debugging ledger'. Also includes domain terms like 'debugging thread', 'investigation ledger', and 'hypotheses'.

Highly distinctive niche: specifically about compressing debugging sessions into structured ledgers. The combination of 'debugging', 'ledger', 'hypotheses', and 'investigation' creates a clear, unique identity unlikely to conflict with general summarization or debugging skills.

Every line serves a purpose. No unnecessary explanations of what debugging is or how ledgers work. The format is lean and assumes Claude understands the concepts.

The output format is a concrete, copy-paste-ready template with clear placeholders. The workflow steps are specific and the rules section provides unambiguous constraints (e.g., exactly one of three labels). This is an instruction-only skill where code isn't needed, and the guidance is fully actionable.

The 6-step workflow is clearly sequenced and logically ordered from extraction through to next experiments. For this type of non-destructive summarization task, explicit validation checkpoints aren't necessary, and the rules section serves as implicit quality checks (e.g., enforcing label consistency).

This is a simple, single-purpose skill under 50 lines. The content is well-organized into clear sections (Goal, Workflow, Output Format, Rules) with no need for external references. The structure supports easy scanning and discovery.