fire-fact-checker

fire-fact-checker is an agent for coding agents from ThierryN/fire-flow. It costs 19 tokens per session (1,999 once invoked), scanned B, original, MIT.

An independent research-checking agent that tries to disprove findings by looking for counter-evidence. It reviews a research synthesis and records claims that are confirmed, challenged, or still uncertain.

In plain words
What is it for?
Use it after research findings have been combined to test individual claims, search for contradictory evidence, and produce a list of contested claims.
Why use it?
It addresses mistakes that can survive when the same person or agent researches and checks its own conclusions. Its sceptical review helps expose plausible but unsupported claims.

Agent

Part of the dominion-flow plugin — 5 skills, 51 commands, 15 agents shipped together

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.

agentmods
npx agentmods add agents/thierryn/fire-flow/fire-fact-checker
Clone the repo
git clone --depth 1 https://github.com/ThierryN/fire-flow

Or install dominion-flow, the plugin that ships this one along with the rest of its 5 skills, 51 commands, 15 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 fire-fact-checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/thierryn/fire-flow/fire-fact-checker.svg)](https://agentmods.dev/agents/thierryn/fire-flow/fire-fact-checker)
Your own site
<a href="https://agentmods.dev/agents/thierryn/fire-flow/fire-fact-checker"><img src="https://agentmods.dev/badge/agents/thierryn/fire-flow/fire-fact-checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,999 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
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 $0.00019 $0.01999
Opus 5 $0.00010 $0.01000
Sonnet 5 $0.00004 $0.00400
Haiku 4.5 $0.00002 $0.00200

Measured 5d ago against content hash 8a0b043b4d1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade B, and why

fire-fact-checker scanned grade B with 1 finding 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 5d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

grep -rl "{counter_keywords}" ~/.claude/plugins/dominion-flow/skills-library/ | head -10
agents/fire-fact-checker.md · 277 lines

How it starts

The opening of the file, as written. The whole thing — 277 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fire Fact-Checker Agent

This agent closes the epistemic gap where self-checks by the same agent that produced findings cannot catch plausible-but-wrong conclusions with internally consistent but factually incorrect reasoning.

<command_wiring>

Command Integration

This agent is spawned by:

  • fire-1-new (new project) — After the synthesizer merges 4 researchers' outputs, the fact-checker challenges the synthesis
  • fire-new-milestone (new milestone) — Same adversarial verification step after synthesis

The fact-checker receives the path to SYNTHESIS.md and produces CONTESTED-CLAIMS.md alongside it.

</command_wiring>


Configuration

name: fire-fact-checker
type: autonomous
color: red
description: Adversarial agent that attempts to disprove research findings
tools:
  - Read
  - Glob
  - Grep
  - Bash
  - WebSearch
  - WebFetch
  - Write
allowed_references:
  - "@.planning/research/"
  - "@.planning/"
  - "@skills-library/"

Core Principle

You are an adversary, not a validator.

Your stance is skeptical by default. For every finding you examine:

  1. Assume it might be wrong
  2. Search for counter-evidence FGTAT
  3. Only mark as "confirmed" if you cannot find credible contradictions
  4. Document your disproof attempts even when they fail (failed disproof = stronger confirmation)

You must NOT:

  • Read the original researchers' reasoning before forming your own search strategy
  • Confirm findings by searching for supporting evidence (that's confirmation bias)
  • Soften contested findings to avoid conflict with the synthesizer
  • Skip findings because they "seem obviously true"

Read the full file on GitHub · 277 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. 5d ago First seen · 277 lines · 19 tokens per session scan B 8a0b043b4d1b

Subscribe to this mod's changes

fire-fact-checker is an agent published in the GitHub repository ThierryN/fire-flow (77 stars, last pushed 23d ago), licensed MIT. It adds 19 tokens to every session and 1,999 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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