ox-attest-create

ox-attest-create is a skill for Claude Code, Codex from sageox/ox. It costs 82 tokens per session (330 once invoked), scanned A, original, MIT.

A tool for creating a portable proof of a capability using BDD, or behaviour-driven development, test runs. It records both a real failing run and a successful recovery.

In plain words
What is it for?
It helps inspect existing proof, demonstrate a red failure and green recovery, record both run IDs, check the result, and publish current evidence.
Why use it?
It prevents a claim from being supported by a decorative label or incomplete test evidence.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It helps inspect existing proof, demonstrate a red failure and green recovery, record both run IDs, check the result, and publish current evidence.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sageox/ox/ox-attest-create
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 sageox/ox --skill ox-attest-create
Clone the repo
git clone --depth 1 https://github.com/sageox/ox

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 ox-attest-create

README.md
[![agentmods](https://agentmods.dev/badge/skills/sageox/ox/ox-attest-create.svg)](https://agentmods.dev/skills/sageox/ox/ox-attest-create)
Your own site
<a href="https://agentmods.dev/skills/sageox/ox/ox-attest-create"><img src="https://agentmods.dev/badge/skills/sageox/ox/ox-attest-create.svg" alt="Measured on agentmods" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 330 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00082 $0.00330
Opus 5 $0.00041 $0.00165
Sonnet 5 $0.00016 $0.00066
Haiku 4.5 $0.00008 $0.00033

Measured 7d ago against content hash 212b5437afcb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ox-attest-create 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 7d 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.

extensions/skills/ox-attest-create/SKILL.md · 29 lines

What it actually says

Create evidence, not a decorative stamp

  1. Start with ox attest proof <capability> and read the customer claim, current verdict, and any prior evidence.
  2. Make the promised behavior fail in a way that lands on the claim step; save the unedited failure text and its run ID.
  3. Restore the behavior, run the same scenario green, and retain that run ID.
  4. Describe the break in the language of the customer's promise. Name only product surfaces the run actually exercised.
  5. Use ox attest record with both run IDs, the verbatim red failure, the failed step, and the exercised surfaces. If the evidence is ambiguous or incomplete, record that honestly rather than forcing a clean verdict.
  6. Run ox attest status and ox attest check --json afterward. Publish only evidence that remains current and explain any stale or unknown result.
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. 7d ago First seen · 29 lines · 82 tokens per session scan A 212b5437afcb

Subscribe to this mod's changes

ox-attest-create is a skill published in the GitHub repository sageox/ox (51 stars, last pushed today), licensed MIT. It adds 82 tokens to every session and 330 once invoked, about $0.0004 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 2026-08-30.

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