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testland/cargo-fuzz-rust

Author and run cargo-fuzz - Rust fuzzing via libFuzzer with cargo integration. Covers `cargo install cargo-fuzz`, `cargo fuzz init` + `cargo fuzz add {target}` for harness scaffolding, the `fuzz_target!` macro for entry-point declaration, the `Arbitrary` trait for structured input mutation, and `cargo fuzz run` invocation. Requires Rust nightly. Use for fuzz testing Rust libraries - cargo-fuzz wraps libFuzzer with native Rust ergonomics.

75

Quality

94%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

Overview
Quality
Evals
Security
Files

Quality

Content

85%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-structured, highly actionable skill body that defers advanced material to a single one-level-deep reference and sequences the fuzz workflow end-to-end. The only weakness is mild attribution verbosity that could be tightened.

Suggestions

Drop repeated provenance phrases ('Per the cargo-fuzz README/docs/convention') — cite once or rely on the References section, since attribution adds tokens without aiding execution.

Tighten the explanatory sentence about `fuzz_target!` wiring `LLVMFuzzerTestOneInput`; the macro name and the closing-body behavior are enough for a competent reader.

Consider moving the inline `sanitiser-integration-reference` / `corpus-management-reference` mentions into the References list only, to keep the spine focused on the cargo-fuzz workflow.

DimensionReasoningScore

Conciseness

Largely lean and code-forward with no concept-padding, but repeats provenance phrases ('Per the cargo-fuzz README/docs/convention' four times) and adds one explanatory sentence about `fuzz_target!` wiring `LLVMFuzzerTestOneInput` that could be trimmed.

2 / 3

Actionability

Every stage ships executable commands and complete `#![no_main]` code blocks — install, init, add, run, reproduce, and `cargo fuzz fmt` — plus a copy-paste options table.

3 / 3

Workflow Clarity

A clear Install → Initialise → Add target → Run → Reproduce crash sequence, with a reproduce-a-crash feedback loop and an anti-patterns table acting as a checklist.

3 / 3

Progressive Disclosure

The spine is an overview; advanced sanitiser variants, ASan report anatomy, and the CI job are split one level deep into references/crash-reports-and-ci.md with clearly signaled links, and composed/sibling skills are grouped under References.

3 / 3

Total

11

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12

Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A tight, specific description that names concrete cargo-fuzz primitives, states the nightly requirement, and gives an explicit use-trigger. It avoids fluff and is clearly distinguishable from sibling fuzzing skills.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — `cargo install cargo-fuzz`, `cargo fuzz init` + `cargo fuzz add {target}`, the `fuzz_target!` macro, the `Arbitrary` trait, and `cargo fuzz run` — far beyond naming a domain.

3 / 3

Completeness

Explicitly answers both what ('Author and run cargo-fuzz - Rust fuzzing via libFuzzer with cargo integration') and when ('Use for fuzz testing Rust libraries'), with an explicit 'Use for' trigger clause.

3 / 3

Trigger Term Quality

Covers natural terms a Rust user would say — 'fuzz testing Rust libraries', 'Rust fuzzing', 'cargo-fuzz', 'libFuzzer' — with good coverage of the niche phrasings.

3 / 3

Distinctiveness Conflict Risk

A clear niche (cargo-fuzz/libFuzzer for Rust crates) with distinct triggers, unlikely to fire for the sibling C++/AFL/Go/JVM fuzzers it composes with.

3 / 3

Total

12

/

12

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Reviewed

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