cross_check

# 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](url), ... | 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 - Zero results → broaden query, retry once. Still empty → T1 confidence. - `web_fetch` fails → skip, note it, drop confidence one level. - All T4 sources → report T2, mark Uncertain. - Contradictions → see `{baseDir}/references/research-patterns.md`. ## Security & Privacy This skill uses only OpenClaw's built-in `web_search` and `web_fetch` tools. No data is sent to external services beyond what these tools do. **External Endpoints:** - Web search API (via OpenClaw's built-in web_search, provider depends on user config) - Web pages (via OpenClaw's web_fetch for verification) **Data Handling:** - No credentials required - No data stored locally - Search queries sent through OpenClaw's configured search provider - No autonomous invocation without user intent - activates when queries contain verification language **Trust Statement:** By using this skill, your search queries are sent through OpenClaw's built-in web search provider. Only install if you trust OpenClaw's data handling practices.