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harness-writing - Write Effective Fuzzing Harnesses

Provides techniques for creating and improving fuzzing harnesses across languages, including input parsing, validation, structured extraction, and coverage iteration.

Tags

Updated: 2026-10-07

Capabilities

Typical Inputs

Typical Outputs

What this skill does

  • Identify fuzz entry points
  • Write minimal harnesses
  • Validate fuzz inputs
  • Structure typed inputs
  • Test harness coverage
  • Improve crash reproducibility

Inputs

  • Target codebase
  • Target APIs
  • Fuzzer-generated bytes
  • Coverage metrics
  • Crash reproduction results

Outputs

  • Fuzzing harness source code
  • Fuzzing coverage results
  • Crash reproducibility results

Requirements

    Source

    • Spec: SKILL.md

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    fuzzing
    harnesses
    coverage
    crash reproduction
    C++
    Rust
    Identify fuzz entry points
    Write minimal harnesses
    Validate fuzz inputs
    Structure typed inputs
    Target codebase
    Target APIs
    Fuzzer-generated bytes
    Fuzzing harness source code
    Fuzzing coverage results
    Crash reproducibility results