Fact-check a teaching claim against sources so the learner can trust the single interface. Use when the user runs /learn-verify or /skill:learn-verify, or says fact-check, verify this, is this true, source this, don't hallucinate, or when a teach/plan step needs a claim checked before it is taught a

Learn verify Trust is engineered. Check the claim before it is taught as fact. When to run Empirical, historical, bibliographic, or API/tool claims Named theorems, identities, or "standard facts" you cannot reconstruct Anything you were about to present with unearned certainty Skip a full search only when you can derive the statement in session and the learner does not need an external citation. Still say that it was derived, not sourced. Method 1. Write the claim in one falsifiable sentence. 2. Fetch or search primary ish sources (paper, textbook, official docs, standard reference). Do not cite a URL you did not open. 3. Quote or paraphrase the supporting line. Note edition / year if it matters. 4. Mark disagreements. Prefer the source the field actually uses. 5. Return a verdict. Verdict qualified = true under stated assumptions (dimension, characteristic, gauge, version). unknown = do not teach it as fact. Say you could not verify. Rules No invented papers, quotes, or page numbers. One claim per run. Batch only if they are the same fact in different words. Write the verdict into the session file if a teach session is open.