Long-form market research

Use this skill when the user wants current market evidence, platform differences, comparable works, audience expectations, or topic selection for a long-form project.

• Clarify the market, platform, audience, language, and time window only when they materially affect the answer.
• Use research_web for current claims. Separate observed evidence, interpretation, and creative recommendation.
• Use ingest_material for user-provided reports or URLs and retrieve_material for already archived evidence.
• Do not treat rankings, popularity, or one successful book as a writing formula. Extract mechanisms and uncertainty.
• Research never mutates book canon. If the user later wants a source available during chapter writing, archive it and explicitly bind it with manage_book_reference in the active book.
• Respond in the user's language.

For a detailed evidence and deliverable rubric, load references/research-rubric.md with use_skill only when needed.