fact-checker SKILL.md skillA
fact-checker from moonlight-lupin/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add moonlight-lupin/agent-skills/fact-checker@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- moonlight-lupin/agent-skills
- Path
research/fact-checker/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.0, committed Oct 5, 2026
- First version recorded
- Jul 8, 2026
- Size
- 13,093 bytes
- Repository stars
- 119
- License
- MIT
Use when a factual claim or assertion needs verification — a targeted claim verification pipeline: search multiple independent sources, cross-check for agreement or contradiction, rate confidence (verified / likely true / disputed / unverified / outdated), and produce a cited verification report.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Fact Checker ## Overview Fact Checker is a targeted verification workflow for **one factual assertion at a time**. It exists because agents often produce claims that sound plausible but may be hallucinated, copied from a weak source, contradicted by later data, or stale after new reporting. A normal research pass can gather useful background while still failing to answer the narrow question: **is this specific claim supported, contradicted, outdated, or not verifiable from available sources?** Use this skill to turn a claim into structured search queries, collect confirming and contradicting passages from multiple independent sources, assess source independence and recency, then produce a concise verification report with citations and a calibrated verdict. ## Quick Start From this skill directory: ```bash python scripts/verify.py structure --claim "Singapore's GDP grew 4.1% in 2025" ``` Or use the compatibility shortcut: ```bash python scripts/verify.py --claim "Singapore's GDP grew 4.1% in 2025" ``` After collecting source passages with a web search tool and web extraction tool, generate a report: ```bash python scripts/verify.py report \ --claim claim.json \ …
Read the whole file at its exact version.
How to install
mdr add moonlight-lupin/agent-skills/fact-checker@sha256:034cef59b334a922The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_wxrulqe6jusp4yv7)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 8, 2026 and Oct 5, 2026, about one every 44 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-10-05 | a776a92 | 13,093 B | A | view · diff |
| v1.0.0 | 2026-08-13 | 090474f | 13,057 B | A | view · diff |
| v1.0.0 | 2026-07-08 | 52f1cb9 | 13,051 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13093 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
moonlight-lupin/agent-skills · 119 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wxrulqe6jusp4yv7 GET https://markdownregistry.com/api/v1/resolve?ref=moonlight-lupin/agent-skills/fact-checker GET https://markdownregistry.com/api/v1/blob/034cef59b334a92261d1baf3e432177934dc8a5d67b9316d8fcf0388854d69c8
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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