x-disprove

x-disprove is a skill for Claude Code, Codex from manabuyasuda/dotfiles. It costs 213 tokens per session (1,092 once invoked), scanned A, original, no licence file.

A critical review step that tests unfinished work by assuming it may fail. It lists problems with supporting reasons and severity, while leaving the decision to accept or reject them to a person.

In plain words
What is it for?
It is for challenging plans, designs, specifications, migrations, documents, research findings, and proposals before they move forward or are shared.
Why use it?
It helps uncover risks before work begins or is handed to others. It avoids using this review for simple proofreading or routine checks.

Skill for Claude CodeCodex

Written for Claude Code and Codex: allowed-tools in frontmatter, but also agents/openai.yaml present.

Good fit It is for challenging plans, designs, specifications, migrations, documents, research findings, and proposals before they move forward or are shared.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/manabuyasuda/dotfiles/x-disprove
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 manabuyasuda/dotfiles --skill x-disprove
Clone the repo
git clone --depth 1 https://github.com/manabuyasuda/dotfiles

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 x-disprove

README.md
[![agentmods](https://agentmods.dev/badge/skills/manabuyasuda/dotfiles/x-disprove/github.svg)](https://agentmods.dev/skills/manabuyasuda/dotfiles/x-disprove)
Your own site
<a href="https://agentmods.dev/skills/manabuyasuda/dotfiles/x-disprove"><img src="https://agentmods.dev/badge/skills/manabuyasuda/dotfiles/x-disprove/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 x-disprove

Your own site · 80×15
<a href="https://agentmods.dev/skills/manabuyasuda/dotfiles/x-disprove"><img src="https://agentmods.dev/badge/skills/manabuyasuda/dotfiles/x-disprove.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 213 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,092 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 $0.00213 $0.01092
Opus 5 $0.00106 $0.00546
Sonnet 5 $0.00043 $0.00218
Haiku 4.5 $0.00021 $0.00109

Measured 8d ago against content hash 71b30e1c16bb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

x-disprove 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 8d 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.

claude/skills/x-disprove/SKILL.md · 48 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 8d ago First seen · 48 lines · 213 tokens per session scan A 71b30e1c16bb

Subscribe to this mod's changes

x-disprove is a skill published in the GitHub repository manabuyasuda/dotfiles (2 stars, last pushed 4d ago), with no licence file. It adds 213 tokens to every session and 1,092 once invoked, about $0.0011 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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