libafl

npx skills add trailofbits/skills --skill libafl --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# LibAFL LibAFL is a modular fuzzing library that implements features from AFL-based fuzzers like AFL++. Unlike traditional fuzzers, LibAFL provides all functionality in a modular and customizable way as a Rust library. It can be used as a drop-in replacement for libFuzzer or as a library to build custom fuzzers from scratch. ## When to Use | Fuzzer | Best For | Complexity | |--------|----------|------------| | libFuzzer | Quick setup, single-threaded | Low | | AFL++ | Multi-core, general purpose | Medium | | LibAFL | Custom fuzzers, advanced features, research | High | **Choose LibAFL when:** - You need custom mutation strategies or feedback mechanisms - Standard fuzzers don't support your target architecture - You want to implement novel fuzzing techniques - You need fine-grained control over fuzzing components - You're conducting fuzzing research ## Quick Start LibAFL can be used as a drop-in replacement for libFuzzer with minimal setup: ```c++ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { // Call your code with fuzzer-provided data my_function(data, size); return 0; } ``` Build LibAFL's libFuzzer compatibility layer: ```bash git clone https://github.