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The operating system for product decisions — what to build, whether to build it, how to communicate it, and when to kill it — before your team commits time, headcount, or capital.

Use this skill when the user has multiple source documents, search results, or notes and wants a structured brief that synthesises them. Triggers include: phrases like 'summarise these', 'write me a brief', 'compare what these say', 'reconcile these sources', or any request to combine 3+ inputs into a coherent narrative with explicit claim attribution. Each claim in the output is tagged with the source(s) it came from. Do NOT trigger for single-source summarisation (use a simpler summariser) or for fact-checking (use the fact-checker skill — synthesis assumes inputs are correct, not verifies them).