fact-check
Skill49 starsChanged 3 months agoMITView on GitHub
Verify a specific claim by finding multiple authoritative sources that confirm or contradict it. Use when the user asks to fact-check, verify, or check whether something is true.
We split this skill into the rules it gives an agent
4 rules. 0 are common, 4 are distinctive, and 0 are very specific to this project.
0
Common
Most of the 31 edited versions we read keep these.
4
Distinctive
This author's own choices. Worth a look.
0
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Distinctive: line 41
If the claim is partly true, be specific about which parts.
- Distinctive: line 44
Don't trust a single source, even an authoritative one, for contested claims.
- Distinctive: line 45
Don't conflate "common knowledge" with verified fact.
- Distinctive: line 46
Don't fabricate confidence — uncertainty is a valid finding.
“Common” is measured: kept by at least 6 in 10 of the 31 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
Fact Check
When to use
The user has stated a specific claim and wants to know if it's accurate. Examples:
- "Is it true that X?"
- "Fact-check this: ..."
- "Did Y actually happen?"
Steps
- Identify the claim — extract the precise factual assertion. If the claim is fuzzy ("apparently X is good"), use
ask_questionsto nail down what specifically to verify. - Search for primary sources — use
web_searchwith the claim phrased neutrally. Look for:- Official sources (government sites, academic papers, the organisation involved)
- Reputable journalism (major outlets with editorial standards)
- Primary data (statistics agencies, public records)
- Avoid these as sole sources:
- Social media posts (use only as leads to follow up)
- Single-source blogs without citations
- Anything that quotes the claim back without independent verification
- Cross-reference — find at least 2-3 independent sources. If they all trace back to one origin, you only have one source.
- Report verdict — use
show_alertwith the appropriate type:success— Confirmed (multiple authoritative sources agree)warning— Partly true / context needederror— False (sources contradict the claim)info— Unverifiable (insufficient evidence either way)
- Provide evidence — list the sources with what each one says. Use markdown links.
Style
- Be neutral. Avoid editorialising.
- Distinguish "X is false" from "I couldn't find evidence for X" — these are different.
- If the claim is partly true, be specific about which parts.
What not to do
- Don't trust a single source, even an authoritative one, for contested claims.
- Don't conflate "common knowledge" with verified fact.
- Don't fabricate confidence — uncertainty is a valid finding.
Other versions38 projects use a version of this.
Word for word · 0
None found.
Edited · 0
None found.
Wrote their own version · 38
- leonardomso/33-js-concepts★ 67ksame name
- THU-MAIC/OpenMAIC★ 42ksame name
- garrytan/gbrain★ 31ksame name
- elvisun/newsjack★ 1.6ksame name
- srid/emanote★ 963same name
- akitaonrails/my-skills★ 283same name
- Jamie-BitFlight/claude_skills★ 67same name
- namedtoaster/The-Last-Mile★ 37same name
- AmethystLuna/embedded-workbench★ 27same name
- aktsmm/Agent-Skills★ 26same name
28 more not listed
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
Used alongsideProjects with it also use deep-research, research and 2 more.
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In this repository32 other files it gives its agents.
- AGENTS.mdAGENTS.md
- docs/AGENTS.mdAGENTS.md
- CLAUDE.mdCLAUDE.md
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