fact-check

name	fact-check
description	Fact-check content by verifying every claim against trusted sources.
argument-hint	<file-path>
user-invocable	true
allowed-tools	Read, Glob, Grep, Bash, WebSearch, WebFetch, Edit, Task, TodoWrite

Fact-check content by verifying claims against trusted sources.

File: $ARGUMENTS

Pass the path to an article or glossary file (e.g., src/content/articles/en/my-article.md).

Phase 1: Extract Claims

Read the target file. Extract every factual claim:

• Dates and historical events — e.g., "X was created in 2009"
• Numbers and statistics — e.g., "N items total", "X per cycle"
• Technical details — How mechanisms work, protocol specifics
• Attributions — e.g., "created by X"
• Temporal claims — e.g., "every N years", "every N minutes"

List each claim clearly.

Phase 2: Verify via content-researcher Agent

Delegate verification to the content-researcher agent. The agent uses a research cache (MCP) to avoid re-verifying known facts — it checks cached findings before doing web searches.

Use the content-researcher agent to verify these claims from the article "[title]":

1. [claim 1]
2. [claim 2]
...

For each claim: confirm, flag as unconfirmed, or mark incorrect with the correct information and source URL.
Check the research cache first; only search the web for uncached or stale topics.

Phase 3: Report

Present the agent's findings in this format:

## Fact-Check Report: <article title>

### Summary
- Total claims checked: N
- Confirmed: N
- Unconfirmed: N
- Incorrect: N

### Details

| Claim | Status | Source | Notes |
|-------|--------|--------|-------|
| "X was created in 2009" | Confirmed | source-url/... | — |
| "reward is Y per cycle" | Incorrect | source-url/... | Corrected: Z per cycle |

For Incorrect Claims

• Exact text that needs to change
• Corrected version
• Source citation

For Unconfirmed Claims

• Why verification failed
• Suggestion: keep, rephrase, or remove

Phase 4: Fix (with permission)

After presenting the report, ask the user if they want you to fix incorrect claims directly. If yes:

1. Fix only factually incorrect statements
2. Do not change tone, structure, or style
3. Commit: content: fact-check corrections in "<title>"