Claim verification
Skill frankxai/starlight-agent-skills/skills/research/claim-verification
Portable Starlight substrate skills for agent runtimes, SIS, ACOS, and cross-agent workflow activation.
npx -y skills add frankxai/starlight-agent-skills --skill claim-verificationAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
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What its author says it does
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Fact-check a claim against sources and return a verdict with evidence and confidence — supported, refuted, partially-supported, or unverifiable. Use when asked to 'verify', 'fact-check', 'is this true', or before publishing a statistic or scientific claim.
SKILL.md
2.8 KB, as published. Nobody here has run it
Claim Verification
A claim + (optional) sources → a verdict with evidence and a calibrated confidence.
Purpose
Before a claim ships in a post, brief, or video, it should be checked. This skill takes a single claim, gathers or accepts sources, and returns a structured verdict that separates what the evidence supports from what it doesn't — with honest confidence, not false certainty.
When it fires
- Keyword triggers:
verify,fact-check,is this true,confirm,source check,debunk - File triggers:
claims.md,fact-check/** - Command triggers:
/claim-verification
Inputs
| Input | Required | Notes |
|---|---|---|
claim | yes | The exact statement to check. |
sources | no | Provided URLs/quotes; else the skill gathers them. |
strictness | no | standard (default) or high (primary sources only). |
Workflow
- Restate the claim precisely — pin the testable assertion; flag ambiguity. ✅ Check: the claim is falsifiable as stated.
- Gather evidence — find/accept sources; prefer primary and authoritative.
- Weigh — does the evidence support, refute, or only partly cover the claim? Note source quality and any conflict.
- Verdict + confidence — assign one of the four verdicts and a confidence level with a one-line rationale.
- Cite — quote the decisive evidence with locations.
Output contract
{
"claim": "string — restated precisely",
"verdict": "supported | refuted | partially-supported | unverifiable",
"confidence": "low | medium | high",
"evidence": [{ "quote": "string", "source": "string" }],
"rationale": "string",
"caveats": ["string"]
}
Tools & MCP
- Tools:
WebSearch,WebFetch,Read. - MCP dependencies: optional docs/library MCP for technical claims.
Quality bar
- Verdict matches the evidence;
unverifiableis used honestly. - Confidence is calibrated, not defaulted to "high".
- Every verdict-driving quote is real and located.
- Source quality is considered, not just source count.
Example
Input: "The James Webb Space Telescope orbits the Earth." → verdict refuted
(it orbits the Sun–Earth L2 point), high confidence, with a cited NASA source.
Built on SIP — Starlight Intelligence Protocol Substrate: starlightintelligence.org/protocol v1.1.0 Layers used: [file-contract, attestation, sovereignty] Vertical: starlight-agent-skills · portable capability layer