fact-check

fact-check is a skill for Claude Code, Codex from THU-MAIC/OpenMAIC. It costs 109 tokens per session (1,666 once invoked), scanned A, original, MIT.

A guide for checking the important factual claims in a course or supplied teaching material. It focuses on errors that could damage trust or change what learners should understand.

In plain words
What is it for?
Reviewing existing lessons for factual mistakes, or verifying a newly created course after all its pages are complete. It can also identify contradictions between different pages.
Why use it?
It reduces incorrect statements and made-up information in educational content without requiring every minor detail to become a research project. When creating a course, it checks the completed pages before delivery.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Reviewing existing lessons for factual mistakes, or verifying a newly created course after all its pages are complete. It can also identify contradictions between different pages.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/thu-maic/openmaic/fact-check
About the project

OpenMAIC is a multi-agent classroom platform that uses agents to plan, build, and revise interactive courses from prompts and uploaded materials. It is designed for immersive learning experiences and supports course components such as slides, quizzes, interactives, projects, images, video, voices, and PowerPoint imports, with catalogue skills covering its workflows.

THU-MAIC/OpenMAIC · 34,007 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add THU-MAIC/OpenMAIC --skill fact-check
Clone the repo
git clone --depth 1 https://github.com/THU-MAIC/OpenMAIC

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fact-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/thu-maic/openmaic/fact-check/github.svg)](https://agentmods.dev/skills/thu-maic/openmaic/fact-check)
Your own site
<a href="https://agentmods.dev/skills/thu-maic/openmaic/fact-check"><img src="https://agentmods.dev/badge/skills/thu-maic/openmaic/fact-check/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fact-check

Your own site · 80×15
<a href="https://agentmods.dev/skills/thu-maic/openmaic/fact-check"><img src="https://agentmods.dev/badge/skills/thu-maic/openmaic/fact-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,666 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. ✓ AI security review Sonnet 5 · 6 Sept 2026 📄 Read the review Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 13
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00109 $0.01666
Opus 5 $0.00055 $0.00833
Sonnet 5 $0.00022 $0.00333
Haiku 4.5 $0.00011 $0.00167

Measured 9d ago against content hash 44979669a187, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

fact-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/agent-runtime/fact-check/SKILL.md · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fact check

Keep serious factual mistakes and AI hallucinations out of the course without turning course-making into an exhaustive audit. Focus on the few claims that materially affect trust.

Choose the mode from the request and current course state; do not ask the user to choose a mode:

  • Creating: when there is no course yet or the user asks to build/rebuild one, load stage-design and run the check only after all pages exist.
  • Reviewing: when content already exists and the user asks to inspect it, report findings first. Do not edit unless fixes were already requested or the user approves findings after the report.

While creating a course

Use the normal stage-design workflow; this skill changes factual handling, not the teaching method, page style, or build sequence.

After all pages exist, call list_scenes, then read every completed page with read_stage using detail:"text"; follow nextOffset until all visible text and narration have been read. Run a quick final sanity check of exact facts and cross-page contradictions. Correct obvious errors before delivery because creating the course already authorizes making its content accurate, subject to the source-of-truth boundary below. Do not interrupt creation with a separate audit report or approval gate unless that boundary requires a user decision; briefly mention only material corrections or remaining uncertainty when handing off the finished course.

When reviewing existing content

For a course, call list_scenes, then read all visible text and narration with read_stage using detail:"text"; follow nextOffset until complete. Respect a narrower scope if the user gave one.

Read once for context and silently shortlist high-signal risks:

  • exact numbers, dates, counts, names, and attributed quotations;
  • laws, standards, formulas, technical definitions, and classifications;
  • “first”, “only”, “always”, “must”, and similar absolute claims;
  • causal or professional conclusions stated as settled fact;
  • contradictions between pages;
  • suspiciously specific claims with no visible support.

Read the full file on GitHub · 154 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 154 lines · 109 tokens per session scan A 44979669a187

Subscribe to this mod's changes

fact-check is a skill published in the GitHub repository THU-MAIC/OpenMAIC (34,007 stars, last pushed today), licensed MIT. It adds 109 tokens to every session and 1,666 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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