Write and run a fuzzer, fuzz harnesses and property-based tests for the code that handles untrusted bytes (file and packet parsers in C, C++, Rust, Go, Python or JS, decoders, serializers, deserializers, token and header parsing, protocol state machines), then minimize, dedupe and triage the crashes into verified findings with regression tests. Covers libFuzzer, cargo-fuzz, Go native fuzzing, Atheris, Jazzer.js and Jazzer, Hypothesis, fast-check and proptest, seed corpora and dictionaries, sanitizer builds, and CI fuzzing with ClusterFuzzLite or OSS-Fuzz. Use when the user mentions 'fuzzing,' 'fuzz harness,' 'fuzz target,' 'libFuzzer,' 'cargo fuzz,' 'go test -fuzz,' 'Atheris,' 'Jazzer,' 'property-based testing,' 'Hypothesis property test,' 'fast-check,' 'proptest,' 'seed corpus,' 'fuzzing dictionary,' 'AddressSanitizer report,' 'fuzzer crash files,' 'minimize a crash input,' 'ClusterFuzzLite,' 'OSS-Fuzz,' or wants to fuzz their parser.