verify-absence-claims

verify-absence-claims is a skill for Claude Code from iamakbarsha1/whetstone. It costs 132 tokens per session (913 once invoked), scanned A, original, CC-BY-4.0.

A checking guide for claims that something is absent, such as saying that no file, feature, or handler exists. It requires the claim to be supported by a focused and repeatable search.

In plain words
What is it for?
Use it before reporting that a feature, file, implementation, or capability was not found, especially when relying on another person's investigation or summary.
Why use it?
Absence is harder to prove than finding a matching file, and a broad or incomplete search can lead to a false conclusion. The guide encourages evidence that others can check.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the whetstone plugin — 25 skills shipped together

Good fit Use it before reporting that a feature, file, implementation, or capability was not found, especially when relying on another person's investigation or summary.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/iamakbarsha1/whetstone/verify-absence-claims
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 iamakbarsha1/whetstone --skill verify-absence-claims
Clone the repo
git clone --depth 1 https://github.com/iamakbarsha1/whetstone

Made for: Claude Code.

Or install whetstone, the plugin that ships this one along with the rest of its 25 skills.

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 verify-absence-claims

README.md
[![agentmods](https://agentmods.dev/badge/skills/iamakbarsha1/whetstone/verify-absence-claims/github.svg)](https://agentmods.dev/skills/iamakbarsha1/whetstone/verify-absence-claims)
Your own site
<a href="https://agentmods.dev/skills/iamakbarsha1/whetstone/verify-absence-claims"><img src="https://agentmods.dev/badge/skills/iamakbarsha1/whetstone/verify-absence-claims/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 verify-absence-claims

Your own site · 80×15
<a href="https://agentmods.dev/skills/iamakbarsha1/whetstone/verify-absence-claims"><img src="https://agentmods.dev/badge/skills/iamakbarsha1/whetstone/verify-absence-claims.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 132 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 913 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 $0.00132 $0.00913
Opus 5 $0.00066 $0.00456
Sonnet 5 $0.00026 $0.00183
Haiku 4.5 $0.00013 $0.00091

Measured 11d ago against content hash 422a1f166355, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

verify-absence-claims 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 11d 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.

skills/verify-absence-claims/SKILL.md · 77 lines

The source is not reproduced here

Licensed CC-BY-4.0

The repository is licensed CC-BY-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 11d ago First seen · 77 lines · 132 tokens per session scan A 422a1f166355

Subscribe to this mod's changes

verify-absence-claims is a skill published in the GitHub repository iamakbarsha1/whetstone (4 stars, last pushed 3d ago), licensed CC-BY-4.0. It adds 132 tokens to every session and 913 once invoked, about $0.0007 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.

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