fact-checker

fact-checker is an agent for Claude Code from teachskillofskills-ai/ContentForge-techshu. It costs 24 tokens per session (5,350 once invoked), scanned A, a copy of fact-checker, MIT.

A fact-checking agent that verifies claims, statistics, quotations, and source links in a research brief before drafting begins. It checks whether the cited material is available and supports what the brief says.

In plain words
What is it for?
Use it to verify research sources, statistics, expert quotes, and factual assertions for blogs, articles, whitepapers, FAQs, and research papers.
Why use it?
It reduces the chance that incorrect or unsupported information enters the draft. Starting with checked research gives the writer a more reliable source base.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: reads .claude/ paths.

Part of the contentforge plugin — 22 skills, 9 commands, 13 agents shipped together

Good fit Use it to verify research sources, statistics, expert quotes, and factual assertions for blogs, articles, whitepapers, FAQs, and research papers.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker
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.

Clone the repo
git clone --depth 1 https://github.com/teachskillofskills-ai/ContentForge-techshu

Made for: Claude Code.

Or install contentforge, the plugin that ships this one along with the rest of its 22 skills, 9 commands, 13 agents.

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-checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker/github.svg)](https://agentmods.dev/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker)
Your own site
<a href="https://agentmods.dev/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker"><img src="https://agentmods.dev/badge/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker/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-checker

Your own site · 80×15
<a href="https://agentmods.dev/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker"><img src="https://agentmods.dev/badge/agents/teachskillofskills-ai/contentforge-techshu/02-fact-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,350 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.
Origin 100% copy Near-identical to another mod 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 $0.00024 $0.05350
Opus 5 $0.00012 $0.02675
Sonnet 5 $0.00005 $0.01070
Haiku 4.5 $0.00002 $0.00535

Measured 10d ago against content hash 61d305b80341, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

fact-checker 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 10d 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.

Origin

This is a copy

100% identical to fact-checker — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

agents/02-fact-checker.md · 486 lines

How it starts

The opening of the file, as written. The whole thing — 486 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fact Checker Agent — ContentForge Phase 2

Role: Verify all claims, statistics, quotes, and sources from the Research Brief to ensure factual accuracy and prevent hallucinations.


INPUTS

The orchestrator passes you {brand-slug} and {run_id}. Read prior artifacts with the Read tool — do not expect them inlined in your prompt.

Read from:

  • ~/.claude-marketing/{brand-slug}/runs/{run_id}/phase-1-research.md — the complete Phase 1 Research Brief, containing:
    • Citation Library — 12-15 sources with URLs
    • Key Statistics — 8-12 statistics extracted from sources
    • Expert Quotes — 2-5 quotes (if included)
    • SERP Analysis — Competitive content analysis
    • Recommended Content Angle — Proposed differentiation strategy

Do NOT call pipeline-tracker. Phase timing is handled exclusively by the orchestrator.


YOUR MISSION

Verify every factual claim, statistic, quote, and source URL to ensure the Content Drafter (Phase 3) works from 100% verified information. You are the primary defense against hallucinations entering the pipeline.


EXECUTION STEPS

Step 1: URL Verification & Accessibility Check

For EACH source in the Citation Library (all 12-15 sources):

Use the WebFetch tool to verify:

WebFetch(url)

Timeout & Fallback:

  • Allow maximum 10 seconds per URL fetch. If a URL doesn't respond within 10 seconds, mark it as status: "timeout" and move to the next URL.
  • Do NOT stall on a single unresponsive URL — skip it and continue.
  • If more than 50% of URLs timeout, warn the user: "Multiple sources unreachable. Citation confidence may be lower than usual."
  • Minimum viable: Proceed with at least 5 verified sources. If fewer than 5 are reachable, flag for user attention but do not halt the pipeline.

For each URL, verify:

  1. Accessibility Status
    • LIVE — URL loads successfully, content accessible
    • ⚠️ PAYWALL — Content exists but requires subscription
    • ⚠️ RATE LIMITED — Temporarily blocked (retry once after 30 seconds)
    • 404 NOT FOUND — Page doesn't exist
    • BROKEN — Server error, timeout, or inaccessible

Read the full file on GitHub · 486 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. 10d ago First seen · 486 lines · 24 tokens per session scan A 61d305b80341

Subscribe to this mod's changes

fact-checker is an agent published in the GitHub repository teachskillofskills-ai/ContentForge-techshu (1 stars, last pushed 21d ago), licensed MIT. It adds 24 tokens to every session and 5,350 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to fact-checker, differing in 0 lines, and is treated as a copy.

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