Borrowing it
Nothing to install: this file belongs to antithesishq/antithesis-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/antithesishq/antithesis-skills/main/AGENTS.mdgit 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/instructions/antithesishq/antithesis-skills/agents-md)<a href="https://agentmods.dev/instructions/antithesishq/antithesis-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/antithesishq/antithesis-skills/agents-md/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/instructions/antithesishq/antithesis-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/antithesishq/antithesis-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01191 | $0.01191 |
| Opus 5 | $0.00596 | $0.00596 |
| Sonnet 5 | $0.00238 | $0.00238 |
| Haiku 4.5 | $0.00119 | $0.00119 |
Grade A, and why
antithesis-skills AGENTS.md 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 10d 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 — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure & Module Organization
This repository is organized as a set of AI skills plus validation tooling.
Add new skills as <skill-name>/SKILL.md at the repository root. Keep each skill self-contained in its own directory.
All skills must align with the specification available here: https://agentskills.io/specification.md
Build, Test, and Development Commands
make validate: checks each*/SKILL.mdfor YAML frontmatter, anamethat matches its directory, a non-TODOdescription, and at least one top-level#heading. This is the canonical structural check.make validate-changelog: validatesCHANGELOG.mdformat.make validate-links: runs thelycheelink checker (config inlychee.toml).make test: runs unit tests for skill helper scripts (process-logs.pyin debug;build-url.pyin query-logs).make install-dev: bootstraps the dev environment viascripts/install.sh.
Coding Style & Naming Conventions
- Shell scripts use Bash with strict mode (
set -euo pipefail); keep new scripts consistent. - Use 2-space indentation in shell blocks to match existing files.
- Skill directories should use lowercase kebab-case (example:
my-new-skill/). SKILL.mdmust include YAML frontmatter with:name: must exactly match the directory name.description: non-empty, notTODO.
- Every
SKILL.mdmust include a top-level Markdown heading (# ...).
Python in skill assets must support Python 3.9+
Scripts under */assets/ ship to customers and run against whatever python3
is on their machine (often macOS system Python 3.9). Keep them compatible
with Python 3.9.
- Add
from __future__ import annotationsat the top so PEP 604 unions (X | None,list[int] | None) and other annotation-only syntax don't evaluate at import time. - Do not use Python 3.10+ runtime features:
match/case,tomllib,typing.Self,ExceptionGroup/except*, parenthesizedwithgroups. - Stick to the standard library — asset scripts must not require
pip installon a customer's machine.
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.
- 10d ago First seen · 107 lines · 1,191 tokens per session scan A 88c986a0fd8d
antithesis-skills AGENTS.md is an instructions file published in the GitHub repository antithesishq/antithesis-skills (267 stars, last pushed yesterday), licensed Apache-2.0. It adds 1,191 tokens to every session, about $0.0060 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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