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Atheris

Listed
trailofbits·vlatest·other·CC-BY-SA-4.0

Atheris generates creative story prompts & character concepts, sparking imagination and overcoming writer's block for diverse narratives.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add trailofbits/skills --skill atheris -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

trailofbits

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill failed 1 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 1 host that is neither well-known infrastructure nor declared in the skill's frontmatter: apt.llvm.org.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

    Hosts contacted

    apt.llvm.orgundeclared

    What it found

    • plugins/testing-handbook-skills/skills/atheris/SKILL.md:91contacts apt.llvm.org
      RUN echo "deb http://apt.llvm.org/bookworm/ llvm-toolchain-bookworm-$LLVM_VERSION main" > /etc/apt/sources.list.d/llvm.list
    • plugins/testing-handbook-skills/skills/atheris/SKILL.md:92contacts apt.llvm.org
      RUN echo "deb-src http://apt.llvm.org/bookworm/ llvm-toolchain-bookworm-$LLVM_VERSION main" >> /etc/apt/sources.list.d/llvm.list
    • plugins/testing-handbook-skills/skills/atheris/SKILL.md:93contacts apt.llvm.org
      RUN wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key > /etc/apt/trusted.gpg.d/apt.llvm.org.asc

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned trailofbits/skills at 82fe822625.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
82fe822625
Manifest
plugins/testing-handbook-skills/skills/atheris/SKILL.md
Scanned
4 files, 565 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

Atheris is a fuzzing tool designed to find bugs in software by generating and testing random inputs. It helps identify security vulnerabilities, crashes, and unexpected behaviors in programs, particularly useful for testing C++ code.

When to use it

  • To test the robustness of a program against invalid or malicious input.
  • During security audits to uncover potential exploits in system-level code.
  • When developing new software and needing automated testing for edge cases.
  • For continuous integration pipelines that require thorough code validation.

Key capabilities

  • Generates random inputs to stress-test programs.
  • Detects crashes, memory errors, and undefined behaviors.
  • Works with C++ code using instrumentation-based fuzzing.
  • Integrates with existing test suites for automated testing.

Example prompts

  • "Use Atheris to find bugs in my C++ application."
  • "Run a fuzzing session on the parser module of this software."
  • "Generate test cases that could cause memory leaks in this codebase."

Tips & gotchas

  • Ensure your code is compiled with instrumentation support for Atheris to work effectively.
  • Fuzzing can be resource-intensive; allocate sufficient compute power and time for thorough testing.