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atheris SKILL.md skillA

atheris from outlinedriven/outline-driven-development is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add outlinedriven/outline-driven-development/atheris@git:20260927.a8fe24d

Pins git:20260927.a8fe24d in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: outlinedriven/outline-driven-development
Path: .devin/skills/atheris/SKILL.md
Versions recorded: 4
Latest version: git:20260927.a8fe24d, committed Sep 27, 2026
First version recorded: Sep 2, 2026
Size: 8,562 bytes
Repository stars: 55
License: Apache-2.0

Use when a user needs to run coverage-guided fuzzing with Atheris against Python code or a Python native extension. Not for remote, credential, publish, deploy, or irreversible changes.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Atheris

## Contract

| Field | Bound contract |
|---|---|
| Trigger | User needs coverage-guided fuzzing for Python code or a Python native extension using Atheris. |
| Authority | Reversible local: writes only the Atheris harness file, a corpus directory, and when required for dependency management `pyproject.toml` and `uv.lock` in the harness directory; rollback is deleting the harness file and corpus directory and restoring `pyproject.toml` and `uv.lock` to their pre-run state. No remote mutation. No source under test is mutated. |
| Side effect | Local writes: a `fuzz.py` (or named) harness, a `corpus/` directory of seed and crash artifacts, and a transient fuzzing process. |
| Done | Atheris executes an instrumented target through a deterministic `TestOneInput` harness, reports coverage, and any saved crash artifact reproduces the same failure when replayed. |

## Inputs

- Target: the Python function or module to fuzz, or the Python C extension to fuzz. Required.
- Target kind: pure Python, or native C extension. Required; it selects the instrumentation and build path.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add outlinedriven/outline-driven-development/atheris@sha256:95383c5ca6a6ab51

The line at the top of this page pins the label git:20260927.a8fe24d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_35d2kbokfk7em2ng.svg)](https://markdownregistry.com/a/art_35d2kbokfk7em2ng)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 4 versions of this file, between Sep 2, 2026 and Sep 27, 2026, about one every 8 days.

version	committed	commit	size	audit
git:20260927.a8fe24d latest	2026-09-27	a8fe24d	8,562 B	A	view · diff
git:20260912.5c5b759	2026-09-12	5c5b759	8,552 B	A	view · diff
git:20260905.1f63894	2026-09-05	1f63894	8,521 B	A	view · diff
git:20260902.1fe14a3	2026-09-02	1fe14a3	8,077 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (8562 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

outlinedriven/outline-driven-development · 55 stars · license Apache-2.0 · pushed 2026-09-28 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_35d2kbokfk7em2ng
GET https://markdownregistry.com/api/v1/resolve?ref=outlinedriven/outline-driven-development/atheris
GET https://markdownregistry.com/api/v1/blob/95383c5ca6a6ab5167ed274dfd70f137f208f470c2b6c5b09dd4db5e361e7c5c

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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