Lean body with no concept-explanation padding (it does not explain what market research is) and uses compact tables; every section earns its place and assumes Claude's competence.

Concrete per-mode tables of exactly what to collect, named search methods per mode ('smart-search', 'browser-guide'), and explicit TAM/SAM/SOM formulas give copy-paste-ready actionable guidance rather than vague direction.

Quality-gate checklist ('交付前检查') with checkboxes acts as an explicit validation checkpoint before delivery, and research modes are clearly sequenced, matching the level-3 anchor with explicit checkpoints.

No bundle files exist and the skill is a self-contained, well-organized single-purpose document under ~120 lines, which per the rubric's simple-skills note can score 3 with well-organized sections alone.

Lists multiple concrete actions — '市场研究、竞品分析、投资人尽调、行业情报' plus '市场规模估算、竞品对比、基金研究、技术扫描' — matching the anchor for listing several specific concrete actions.

Clearly answers both what ('开展市场研究...摘要') and when via an explicit trigger clause ('当用户需要...时触发'), matching the level-3 example with explicit triggers.

'当用户需要市场规模估算、竞品对比、基金研究、技术扫描或支撑商业决策的研究时触发' provides good coverage of natural terms a user would actually say, well beyond the level-2 anchor.

Niche is business/investment research with distinct triggers unlikely to fire for unrelated skills; not generic enough to overlap with many skills.