Source Checker — verify a claim and rate the evidence
Verify a factual claim — "check this claim", "verify this", "is this true", "how solid is this". Finds primary sources and rates the evidence as supported, mixed, unsupported or unverifiable, with cit
SKILL.md.claude/skills/source-checker/SKILL.md
GitHubSource Checker
Does: verifies a claim and tells you how solid the evidence really is. Solves: repeating something confident that turned out wrong. Triggers on: "check this claim" + the statement
How Maxim does this (researcher-writer separation, structurally)
Isolates the exact claim, finds primary sources (web/research), and rates the evidence — supported / mixed / unsupported / unverifiable — citing what it found. It separates gathering from asserting (the researcher-writer split): it reports what the sources say, not what it "believes."
Behavioral overlay
- Frameworks (cited per ADR-007): CRAAP test (Currency, Relevance, Authority, Accuracy, Purpose) · Bayesian evidence weighting (how much this should move your prior) · the Maxim no-fabrication rule.
- Confidence tag (ADR-010) is the whole point: the verdict is a confidence rating, and it names what would change it.
- CSO-adjacent: for medical/legal/financial claims,
security-analystis looped — it flags regulated claims rather than ruling on them.
Output
Verdict (supported / mixed / unsupported / unverifiable) · evidence quality per source · the citations · what would change the verdict.