falsify

falsify is a command for Claude Code from zircote-plugins/sigint. It costs 27 tokens per session (171 once invoked), scanned A, original, MIT.

A research check that searches the web for evidence contradicting a finding. It can mark findings for removal from consideration, lower their confidence, or add notes based on the result.

In plain words
What is it for?
Use it to challenge claims in an active research session and record how each claim should be treated after the search.
Why use it?
It helps catch conclusions that appear true only because opposing evidence was not checked.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool.

Part of the sigint plugin — 16 skills, 9 commands, 6 agents, 1 hook shipped together

Good fit Use it to challenge claims in an active research session and record how each claim should be treated after the search.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/zircote-plugins/sigint/falsify
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/zircote-plugins/sigint

Made for: Claude Code.

Or install sigint, the plugin that ships this one along with the rest of its 16 skills, 9 commands, 6 agents, 1 hook.

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 falsify

README.md
[![agentmods](https://agentmods.dev/badge/commands/zircote-plugins/sigint/falsify/github.svg)](https://agentmods.dev/commands/zircote-plugins/sigint/falsify)
Your own site
<a href="https://agentmods.dev/commands/zircote-plugins/sigint/falsify"><img src="https://agentmods.dev/badge/commands/zircote-plugins/sigint/falsify/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 falsify

Your own site · 80×15
<a href="https://agentmods.dev/commands/zircote-plugins/sigint/falsify"><img src="https://agentmods.dev/badge/commands/zircote-plugins/sigint/falsify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 171 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 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 $0.00027 $0.00171
Opus 5.5 $0.00011 $0.00068
Sonnet 5.5 $0.00005 $0.00034
Haiku 4.5 $0.00003 $0.00017

Measured 1mo ago against content hash 6498b745ae00, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

falsify 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 1mo 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.

commands/falsify.md · 13 lines

What it actually says

Load and execute the sigint:falsify skill.

$ARGUMENTS are passed through to the skill as-is.

Run adversarial falsification on the active research session now based on: $ARGUMENTS

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. 1mo ago First seen · 13 lines · 27 tokens per session scan A 6498b745ae00

Subscribe to this mod's changes

falsify is a command published in the GitHub repository zircote-plugins/sigint (24 stars, last pushed 2mo ago), licensed MIT. It adds 27 tokens to every session and 171 once invoked, about $0.0001 per session on Opus 5.5. 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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