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Fact Checker

Verifies factual claims in your documents against authoritative sources and applies corrections only after your approval.

Content & WritingBeginner★ 1,323⑂ 212AI score 10/10Last updated: Aug 8, 2026

What it does

Scans a document for verifiable claims (specs, version numbers, dates, statistics, benchmark scores), searches official sources on the web, and produces a comparison table with four statuses (accurate, incorrect, outdated, unverifiable). It then writes a structured fact-check report and, only after you approve, edits the file and summarizes what changed.

  • Skips opinions, prose, and tutorial instructions
  • Prefers official announcements, API docs, GitHub releases, and package registries
  • Enforces temporal context ("as of January 2026") and citation links
  • Includes rules for conflicting sources and missing sources

Who it's for

  • Technical writers and bloggers who publish numbers, specs, and versions
  • Anyone refreshing stale documentation to current reality
  • Analysts who must sanity-check statistics cited in reports or decks

Examples

  1. "Fact-check the AI model context windows in section 2.1" → flags outdated model names and token counts with official doc links
  2. "Verify the benchmark scores in chapter 5" → compares each figure to the original publication and marks mismatches
  3. "Check whether the library versions in the README are current" → queries npm/PyPI and lists outdated pins with changelog references

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/daymade/claude-code-skills/HEAD/fact-checker/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the fact-checker folder from the GitHub repo daymade/claude-code-skills into my ~/.claude/skills/fact-checker/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/daymade/claude-code-skills.git && mkdir -p ~/.claude/skills && cp -r claude-code-skills/fact-checker ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repo: git clone https://github.com/daymade/claude-code-skills.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r claude-code-skills/fact-checker ~/.claude/skills/
  5. Confirm that ~/.claude/skills/fact-checker/SKILL.md exists.
  6. Restart Claude Code and ask something like "fact-check this document".
  7. Make sure web search is enabled, since verification depends on it.
View source on GitHub ↗License: MIT