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.
npx skills add antithesishq/antithesis-skills --skill antithesis-documentationgit clone --depth 1 https://github.com/antithesishq/antithesis-skillsWrote 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.
[](https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-documentation)<a href="https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-documentation"><img src="https://agentmods.dev/badge/skills/antithesishq/antithesis-skills/antithesis-documentation/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.
<a href="https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-documentation"><img src="https://agentmods.dev/badge/skills/antithesishq/antithesis-skills/antithesis-documentation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00041 | $0.01154 |
| Opus 5 | $0.00020 | $0.00577 |
| Sonnet 5 | $0.00008 | $0.00231 |
| Haiku 4.5 | $0.00004 | $0.00115 |
Grade A, and why
antithesis-documentation 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Antithesis Documentation
Skill version: 2026-09-08 2e4a837
Antithesis Overview
Antithesis is a testing platform that works like a specialized staging environment. You ensure your software is reliable by deploying it to Antithesis and running it there before you deploy it to production. It supplements your existing testing tools and lives alongside your normal CI/CD workflow.
When you deploy to Antithesis, your software runs in a simulation environment that is much more hostile than production. This quickly exposes bugs, including complicated, unlikely, and severe failures.
Because Antithesis's environment is perfectly deterministic, problems are reproducible with minimal effort. Unlike typical shared staging, you do not need to compete for deployment locks or worry about environmental drift since every deployment is completely isolated from one another.
Accessing Documentation
The best way to access Antithesis documentation on the command line is via the Antithesis CLI which is called snouty.
Run snouty docs --help to get started.
If snouty is missing
- Tell the user
snoutyis the Antithesis CLI. - Point them to the install source:
https://github.com/antithesishq/snouty - Ask whether they want you to install it. If yes, follow instructions in
https://raw.githubusercontent.com/antithesishq/snouty/refs/heads/main/README.md. - After installation, re-run
snouty --help.
Using snouty docs
Use snouty docs to discover authoritative Antithesis documentation before giving detailed guidance. Inspect snouty docs --help to discover subcommands and usage examples.
Recommended workflow:
- Start with
snouty docs tree --depth 2to get a quick overview of the docs. - Use
snouty docs tree <filter>to explore a section when you know the area but not the exact page name. - Use
snouty docs search <terms>to find likely pages for a specific topic. - Use
snouty docs search -l <terms>when you want just the page paths. - Use
snouty docs show <path>to read the full markdown page once you know the path. - Cite the relevant documentation pages in your answer.
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.
- 2d ago Changed 11473468d53a
- 7d ago Changed cee74baabffd
- 11d ago First seen · 92 lines · 41 tokens per session scan A faf730337dd4
antithesis-documentation is a skill published in the GitHub repository antithesishq/antithesis-skills (267 stars, last pushed 2d ago), licensed Apache-2.0. It adds 41 tokens to every session and 1,154 once invoked, about $0.0002 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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