book-fact-checker

book-fact-checker is an agent for Claude Code from JHamidun/claude-code-config-pack. It costs 120 tokens per session (1,747 once invoked), scanned A, original, no licence file.

An agent that checks non-fiction book chapters against primary sources, such as original research or official records.

In plain words
What is it for?
Use it to fact-check book chapters and label claims as verified, unknown, failed, or critical when supported by the available evidence.
Why use it?
It helps find incorrect numbers, names, quotations, and citations, while separating claims that cannot be checked publicly from verified or contradicted claims.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Good fit Use it to fact-check book chapters and label claims as verified, unknown, failed, or critical when supported by the available evidence.

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Install with agentmods
npx agentmods add agents/jhamidun/claude-code-config-pack/book-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/JHamidun/claude-code-config-pack

Made for: Claude Code.

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 book-fact-checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/jhamidun/claude-code-config-pack/book-fact-checker.svg)](https://agentmods.dev/agents/jhamidun/claude-code-config-pack/book-fact-checker)
Your own site
<a href="https://agentmods.dev/agents/jhamidun/claude-code-config-pack/book-fact-checker"><img src="https://agentmods.dev/badge/agents/jhamidun/claude-code-config-pack/book-fact-checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 120 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,747 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 unknown 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 $0.00120 $0.01747
Opus 5 $0.00060 $0.00873
Sonnet 5 $0.00024 $0.00349
Haiku 4.5 $0.00012 $0.00175

Measured 7d ago against content hash 0e9a0da6bbaf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

book-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 7d 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.

.claude/agents/book-fact-checker.md · 158 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 7d ago First seen · 158 lines · 120 tokens per session scan A 0e9a0da6bbaf

Subscribe to this mod's changes

book-fact-checker is an agent published in the GitHub repository JHamidun/claude-code-config-pack (9 stars, last pushed 11d ago), with no licence file. It adds 120 tokens to every session and 1,747 once invoked, about $0.0006 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 2026-08-31.

Related

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