Ask a question about the product's own history — decisions, constraints, what customers said — and get the fragments that bear on it, each with the source it came from. Returns 'nothing answers that' rather than guessing when the brain has not read it.

Statements in the project's sources that cannot both be true, with both sides quoted and the question somebody has to answer to resolve each one. This is usually the highest-value call: contradictions are what a person cannot hold in their head across six tools.

Questions no source answers, with the role that can answer each and what it blocks. Deliberately returns no citations — there is nothing to cite, which is the point.

Everything the brain has read for this project — interviews, PRDs, tickets, threads, docs — with how many fragments came out of each. Use it to see what an answer could possibly be based on before you trust one.

Fetch one fragment by id with its full text and where it sits in its source. Every other tool cites fragment ids; this is how you open one.

Draft a PRD section, user stories or acceptance criteria for a topic, with every line traced to the fragment behind it and the open questions listed underneath. Refuses to draft when no source supports the topic.