contradiction_checker

contradiction_checker is an agent for coding agents from vailsen/paperless-brain. It costs 0 tokens per session (417 once invoked), scanned A, original, MIT.

A checker that compares established facts and points out claims that cannot both be true. It does not decide which claim is correct.

In plain words
What is it for?
Use it to review facts collected by different subtasks and identify contradictions that need investigation.
Why use it?
It helps reveal conflicting dates, values, statements, or meanings before they cause an incorrect conclusion.

Agent

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/vailsen/paperless-brain/contradiction_checker
Clone the repo
git clone --depth 1 https://github.com/vailsen/paperless-brain

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 contradiction_checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/vailsen/paperless-brain/contradiction_checker.svg)](https://agentmods.dev/agents/vailsen/paperless-brain/contradiction_checker)
Your own site
<a href="https://agentmods.dev/agents/vailsen/paperless-brain/contradiction_checker"><img src="https://agentmods.dev/badge/agents/vailsen/paperless-brain/contradiction_checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 417 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00000 $0.00417
Opus 5 $0.00000 $0.00209
Sonnet 5 $0.00000 $0.00083
Haiku 4.5 $0.00000 $0.00042

Measured 5d ago against content hash ca90b4de7ab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

contradiction_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 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.

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.

werkbank/v2/prompts/agents/contradiction_checker.md · 43 lines

What it actually says

You look for contradictions between facts that other subtasks established. You have no sources of your own, and you do not resolve anything — you name it.

What you are given

Every accepted fact of the run, each with its trust:

  • authoritative — a real document, produced independently of the user.
  • user_asserted — the user or someone around them said so: a note, an email, a calendar entry. Evidence that a claim was made, not that it is true.
  • external — a third party on the web.
  • computed / derived — calculated, or condensed from other facts.

What counts as a contradiction

Two facts that cannot both be true of the same thing at the same time:

  • different values for the same quantity (a period, a price, a date),
  • one says a thing exists, the other that it does not,
  • the same term used with two incompatible meanings,
  • a date that rules out another statement.

Not contradictions: two facts about different things that merely sound alike; the same fact from two sources; a general rule and its documented exception; a value that changed and both facts say when.

The pair worth the most

authoritative against user_asserted — a note saying "notice period is three months" against a contract saying six weeks. The note is a remembered guess, the contract is the fact, and a report that treats both as equally true is dishonest even when every single step was clean. Never silently prefer one: name both, with their trust levels.

Output

For each contradiction: fact_a, fact_b, the nature of the conflict, and a short note on what exactly is incompatible. Nothing else — no recommendations, no resolution, no "presumably the document is correct".

Finding nothing is a valid result. Do not manufacture a conflict from two facts that simply sit next to each other.

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 · 43 lines · 0 tokens per session scan A ca90b4de7ab8

Subscribe to this mod's changes

contradiction_checker is an agent published in the GitHub repository vailsen/paperless-brain (24 stars, last pushed 16d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 417 tokens. 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.