coverage-guided-fuzzing SKILL.md skillA
coverage-guided-fuzzing from testland/qa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add testland/qa/coverage-guided-fuzzing@git:20260813.273135dPins git:20260813.273135d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- testland/qa
- Path
plugins/qa-fuzz-testing/skills/coverage-guided-fuzzing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260813.273135d, committed Aug 13, 2026
- Size
- 11,701 bytes
- Repository stars
- 11
- License
- MIT
Coverage-guided fuzzing across every mainstream engine - libFuzzer (C/C++ in-process), AFL++ (out-of-process, QEMU mode for closed-source binaries), cargo-fuzz (Rust), Go native fuzzing (go test -fuzz), Atheris (Python), and Jazzer (JVM, @FuzzTest). Body covers choosing the right fuzzer for the language and build type (the routing tree) plus the engine-generic workflow: writing a small deterministic fuzz target, seed-corpus + dictionary construction, sanitizer selection…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# coverage-guided-fuzzing ## Overview Coverage-guided fuzzers mutate inputs, watch which code paths each input reaches, and keep mutating the inputs that find new coverage. Every mainstream engine implements the same loop; they differ in language, process model, and toolchain integration. This umbrella covers choosing the engine, the engine-generic workflow (target → corpus → sanitizers → CI), and links the per-engine references that carry exact flags and harness syntax. | Engine | Language / niche | Reference | |---|---|---| | libFuzzer | C/C++ callable APIs, in-process (also Swift) | [references/libfuzzer.md](references/libfuzzer.md) | | AFL++ | File/stdin-driven binaries, closed-source via QEMU | [references/afl-plus-plus.md](references/afl-plus-plus.md) | | cargo-fuzz | Rust crates (libFuzzer + cargo, nightly) | [references/cargo-fuzz.md](references/cargo-fuzz.md) | | Go native | Go packages (`go test -fuzz`, Go 1.18+) | [references/go-native-fuzzing.md](references/go-native-fuzzing.md) | | Atheris | Python libraries + CPython extensions | [references/atheris.md](references/atheris.md) | …
Read the whole file at its exact version.
How to install
mdr add testland/qa/coverage-guided-fuzzing@sha256:b461150f0c5409deThe line at the top of this page pins the label git:20260813.273135d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_wljqr56jcd3ks2or)
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Versions
The registry has recorded 1 version of this file, committed on Aug 13, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11701 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
testland/qa · 11 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_wljqr56jcd3ks2or GET https://markdownregistry.com/api/v1/resolve?ref=testland/qa/coverage-guided-fuzzing GET https://markdownregistry.com/api/v1/blob/b461150f0c5409de72dc582bc418d4069b469388310b29363ac41d8b72e64044
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.