ossfuzz
An agent skill by trailofbits, from trailofbits/skills. Tags: cloud, devops, fuzzing, testing.
What it does
Enrolls a project in OSS-Fuzz, Google's free continuous fuzzing service for open source, and drives it locally. Covers project.yaml, Dockerfile and build.sh setup, the helper scripts, reproducing OSS-Fuzz crash reports, and the acceptance criteria. Use when setting up continuous fuzzing for an open-source project, reproducing an OSS-Fuzz bug report, or testing an OSS-Fuzz build before submitting it.
Install
With the skills CLI, which installs into Claude Code, Codex, Cursor and other agents:
npx skills add trailofbits/skills --skill ossfuzzOr copy the skill folder into Claude Code's skills directory by hand (~/.claude/skills for every project, or .claude/skills inside one):
git clone --depth 1 https://github.com/trailofbits/skills
cp -r skills/plugins/testing-handbook-skills/skills/ossfuzz ~/.claude/skills/ossfuzzSafety box score
Not rated yet. A safety box score grades what a skill and its scripts can reach on the machine of whoever installs it, across eight categories from shell execution to secrets access. Anyone can request one from this page; it is saved for everyone. How the score works.
Source
- Repository
- trailofbits/skills (all skills from this repository)
- Path
- plugins/testing-handbook-skills/skills/ossfuzz/SKILL.md
- Branch
- main
- Collection
- testing-handbook-skills
- Updated
- 2026-09-19
Related skills
- terraform-engineer — Use when implementing infrastructure as code with Terraform across AWS, Azure, or GCP.
- aflpp — Sets up and runs AFL++ for multi-core fuzzing of C/C++ projects built with afl-clang-fast or afl-gcc-fast.
- atheris — Sets up and runs Atheris, the coverage-guided Python fuzzer built on libFuzzer.
- cargo-fuzz — Sets up and runs cargo-fuzz, the standard fuzzing tool for Cargo-based Rust projects. Covers cargo fuzz init, the nightly toolchain requirement, fuzz_target!
- fuzzing-dictionary — Builds and applies fuzzing dictionaries so a fuzzer can produce the keywords, magic bytes, and tokens a target expects.
- fuzzing-obstacles — Patches past the barriers that stop a fuzzer making progress — checksum and hash verification, magic-value validation, time-based seeds.