What is antithesis-launch?

A launch workflow for Antithesis, a platform that tests software by running it in unusual and difficult conditions. It uses snouty, Antithesis's command-line tool, to build, validate, and submit a run.

Preparing and launching an Antithesis test run from a repository. A duration in minutes is required before the run can be submitted.

It organizes the required launch steps and stops before submission when validation fails. It also finds the relevant Docker Compose setup in the repository.

antithesis-launch — Skill for Claude Code by antithesishq

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 antithesishq/antithesis-skills --skill antithesis-launch

Clone the repo

git clone --depth 1 https://github.com/antithesishq/antithesis-skills

Made for: Claude Code.

Or install antithesis-skills, the plugin that ships this one along with the rest of its 12 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/antithesishq/antithesis-skills/antithesis-launch/github.svg)](https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-launch)

Your own site

<a href="https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-launch"><img src="https://agentmods.dev/badge/skills/antithesishq/antithesis-skills/antithesis-launch/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/antithesishq/antithesis-skills/antithesis-launch"><img src="https://agentmods.dev/badge/skills/antithesishq/antithesis-skills/antithesis-launch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,370 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

Socket pass 15 May 2026
Snyk pass 15 May 2026
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.

Model	Per session	Once invoked
Fable 5.1	$0.00081	$0.01370
Opus 5	$0.00041	$0.00685
Sonnet 5	$0.00016	$0.00274
Haiku 4.5	$0.00008	$0.00137

Measured 2d ago against content hash 0c50cf0b3c5a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

antithesis-launch 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.

antithesis-launch/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Antithesis Launch

Skill version: 2026-09-08 2e4a837

Prerequisites

DO NOT PROCEED if snouty is not installed. See https://raw.githubusercontent.com/antithesishq/snouty/refs/heads/main/README.md for installation options.
Run snouty doctor. It checks the container runtime and the compose CLI. Report both to the user and build with that same pair. This skill writes docker compose; use docker-compose instead when that is the CLI snouty names.

Goal

Launch an Antithesis run in this order only:

docker compose build (skip if directed to use pre-built images)
snouty validate
if validation fails, stop and report the error
snouty launch

Required Input

duration in minutes is required. If the user did not provide it, ask before submitting the run.

Discovery

Start from any user-provided path, command, or Antithesis directory name.
Otherwise, inspect the repo to understand how the harness is wired. Check nearby AGENTS.md, README*, Makefile*, and Antithesis-specific scripts before choosing commands.
Find the config directory by locating the docker-compose.yaml intended for Antithesis. Prefer directories like antithesis/config, but support non-standard layouts.
Treat these as strong Antithesis signals: nearby scratchbook/ or test/ directories, compose content mentioning /opt/antithesis, ANTITHESIS_ env vars, setup_complete, or existing snouty examples.
If multiple compose files look plausible, prefer the one referenced by repo docs or existing snouty launch examples. If the choice is still ambiguous, ask the user instead of guessing.
Use the directory containing docker-compose.yaml as the snouty validate <CONFIG> and snouty launch --config <CONFIG> argument.
Build against that exact file: docker compose -f <CONFIG>/docker-compose.yaml build.
snouty never builds or pulls images, so every image must already be in the store of the engine snouty selects. snouty prefers podman when both engines are installed.
- Use SNOUTY_CONTAINER_ENGINE=docker to force snouty to use docker's store.
When using podman, build with podman compose -f <CONFIG>/docker-compose.yaml build. That wrapper execs Docker Compose v2 against podman's API socket, so the image lands in podman's store. Check the provider first: podman compose version must print Docker Compose version ..., because podman falls back to the podman-compose Python tool when it finds no Compose v2 binary.

Read the full file on GitHub · 95 lines

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.

2d ago Changed · +3 lines 0c50cf0b3c5a
7d ago Changed 772e31a01ca5
11d ago First seen · 92 lines · 81 tokens per session scan A 7a3e2824369f

Subscribe to this mod's changes

antithesis-launch is a skill published in the GitHub repository antithesishq/antithesis-skills (267 stars, last pushed 2d ago), licensed Apache-2.0. It adds 81 tokens to every session and 1,370 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.

Testing

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antithesis-launch