Cross Check

Multi-source verification for factual claims with confidence scoring and source links.

Workflow

1. Optimize query — see {baseDir}/references/query-optimization.md.
2. Search first (REQUIRED) — ALWAYS use web_search as the primary tool. Never skip to web_fetch directly. Run web_search(query, count=10). If T1 found, stop. If only T2-3, run a second query. If contradictions, investigate.
3. Evaluate sources — classify by tier. See {baseDir}/references/source-tiers.md.
4. Direct verify (optional, only after search) — use web_fetch(url) only to verify specific URLs found via search. Never use web_fetch as a substitute for web_search.
5. Present — MUST include clickable source URLs for every result:

   [Answer] Confidence: [T1-T5] ([%]) | Sources: name, ... | Verified: [date] | Note: [caveats]

Source URLs

CRITICAL: Every cited source MUST include a direct clickable URL. If URL unavailable: T1 → find alternative source, T2+ → downgrade one tier. Never list a source without its URL.

Error Handling