# Skill: fact-check your Google Doc

Published: 2026-09-21T00:00:00.000Z
Canonical: https://wow.pjh.is/journal/fact-check-skill

My [`fact-check` skill](https://github.com/HartreeWorks/skill--fact-check) checks a Google Doc or web page, generates a review interface, then writes the fixes I approve back into the doc.

I run:

**Prompt**

```
/fact-check https://docs.google.com/document/d/<doc-id>/edit
```

The agent extracts the text and lists every checkable claim—dates, figures, quotes, who did what, the representation of linked content—and verifies them with parallel subagents. A separate pass hunts for overstatements. Every quote must be re-found by string search in a saved copy of the source, so the agent can't invent one.

The review interface:

![The review page: the document on the left with claims highlighted red, amber and green; on the right a card for the selected claim showing the finding, the current wording struck through, an editable new wording with Queue edit and Dismiss buttons, and the source passage with Source viewer and Website links.](https://wow.pjh.is/static/images/blog/fact-check-review-page.png)

There's a source viewer to see the quoted passage in context:

![The source viewer: a dialog showing the METR report rendered from Markdown, scrolled to the quoted passage highlighted in amber, with Close and Open website buttons.](https://wow.pjh.is/static/images/blog/fact-check-source-viewer.png)

I review the outputs, then click "Send to agent", and the agent writes them back into my Google Doc:

![The Google Doc after the agent applied the queued edit: 'around 1,200 of them' struck through and 'around 700 of them' inserted as a tracked suggestion, with an anchored comment giving the reason and the METR quote.](https://wow.pjh.is/static/images/blog/fact-check-google-doc-suggestion.png)

N.B. I made this in \~1 hour, and I've only used it a few times. I've been very happy with the results, but the fact checker prompts and agent orchestration could likely be improved a bunch.