claim-negation

claim-negation is a skill for Claude Code, Codex from yogsoth-ai/stress-test. It costs 20 tokens per session (159 once invoked), scanned A, a copy of claim-negation, Apache-2.0.

A claim-negation tool that produces the precise logical opposite of a statement, including its original scope.

In plain words
What is it for?
Use it to create formal counterclaims for reductio testing, a method of checking an idea by exploring its consequences when assumed false.
Why use it?
It makes it easier to test whether an argument holds by examining what would follow if the central claim were false.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents.

Good fit Use it to create formal counterclaims for reductio testing, a method of checking an idea by exploring its consequences when assumed false.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/yogsoth-ai/stress-test/claim-negation
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.

Any agent
npx skills add yogsoth-ai/stress-test --skill claim-negation
Clone the repo
git clone --depth 1 https://github.com/yogsoth-ai/stress-test

Made for: Claude Code, Codex.

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 claim-negation

README.md
[![agentmods](https://agentmods.dev/badge/skills/yogsoth-ai/stress-test/claim-negation/github.svg)](https://agentmods.dev/skills/yogsoth-ai/stress-test/claim-negation)
Your own site
<a href="https://agentmods.dev/skills/yogsoth-ai/stress-test/claim-negation"><img src="https://agentmods.dev/badge/skills/yogsoth-ai/stress-test/claim-negation/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 claim-negation

Your own site · 80×15
<a href="https://agentmods.dev/skills/yogsoth-ai/stress-test/claim-negation"><img src="https://agentmods.dev/badge/skills/yogsoth-ai/stress-test/claim-negation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 159 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 $0.00020 $0.00159
Opus 5 $0.00010 $0.00079
Sonnet 5 $0.00004 $0.00032
Haiku 4.5 $0.00002 $0.00016

Measured 9d ago against content hash dd6a1a4c2698, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

claim-negation 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 9d 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 claim-negation — 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.

skills/claim-negation/SKILL.md · 27 lines

What it actually says

Claim Negation

Subagent that takes a claim P and produces its formal negation ~P, ensuring the negation is logically precise and preserves scope.

Available SOPs

Optional, no fixed order; the final leaf is always a sop.

SOP When to use
spawn-agent Spawn a customized CC subagent with full MCP tool access. Used by SOPs that declare execution: subagent.
Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 27 lines · 20 tokens per session scan A dd6a1a4c2698

Subscribe to this mod's changes

claim-negation is a skill published in the GitHub repository yogsoth-ai/stress-test (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 20 tokens to every session and 159 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 claim-negation, differing in 0 lines, and is treated as a copy.

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