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libfuzzer
75 / 100 · Review before installing
Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.
By onfire7777/universal-ai-skills-library (GitHub) · coding · 17 stars · scanned at commit 2a76bf4
Coverage-guided fuzzer built into LLVM for C/C++ projects. Use for fuzzing C/C++ code that can be compiled with Clang.
Works with any agent that supports SKILL.md skills.
What this skill can do
Runs commands on your computer
The author does not mention this. Expected for a coding skill.
Found in 47 places.
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- skills/libfuzzer/SKILL.md, line 77
brew install llvm - skills/libfuzzer/SKILL.md, line 92
clang++ --version - skills/libfuzzer/SKILL.md, line 212
clang++ -fsanitize=fuzzer -g -O2 harness.cc target.cc -o fuzz - skills/libfuzzer/SKILL.md, line 225
clang++ -fsanitize=fuzzer,address -g -O2 -U_FORTIFY_SOURCE harness.cc target.cc -o fuzz - skills/libfuzzer/SKILL.md, line 230
clang++ -fsanitize=fuzzer,address,undefined -g -O2 harness.cc target.cc -o fuzz - skills/libfuzzer/SKILL.md, line 255
export CC=clang CFLAGS="-fsanitize=fuzzer-no-link -fsanitize=address" - skills/libfuzzer/SKILL.md, line 263
clang++ -fsanitize=fuzzer -fsanitize=address harness.cc libmylib.a -o fuzz - skills/libfuzzer/SKILL.md, line 280
cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ . - skills/libfuzzer/SKILL.md, line 291
mkdir corpus/ - skills/libfuzzer/SKILL.md, line 298
cp examples/*.png corpus/ - skills/libfuzzer/SKILL.md, line 321
mkdir minimized_corpus/ - skills/libfuzzer/SKILL.md, line 335
./fuzz corpus/ - skills/libfuzzer/SKILL.md, line 343
./fuzz -fork=1 -ignore_crashes=1 corpus/ - skills/libfuzzer/SKILL.md, line 352
./fuzz -max_len=4000 corpus/ - skills/libfuzzer/SKILL.md, line 358
./fuzz -timeout=2 corpus/ - skills/libfuzzer/SKILL.md, line 364
./fuzz -dict=./format.dict corpus/ - skills/libfuzzer/SKILL.md, line 369
./fuzz -close_fd_mask=3 corpus/
and 27 more places
Downloads and installs other software
The author does not mention this.
Found in 4 places.
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Sends data to these websites: downloads.sourceforge.net, raw.githubusercontent.com
The author does not mention this.
Found in 4 places.
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Safer alternatives
Low-risk skills in the same category (coding) that look related. Check that one does what you need.
Install
Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.
if [ -e ~/.agents/skills/'libfuzzer' ] || [ -L ~/.agents/skills/'libfuzzer' ]; then echo 'A skill folder named libfuzzer already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/onfire7777/universal-ai-skills-library' "$d" && git -C "$d" checkout --quiet '2a76bf42ce5c860adf8d0f3fcf3f6804109ac65b' -- 'skills/libfuzzer' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/libfuzzer' ~/.agents/skills/'libfuzzer' && rm -rf "$d"; fi
Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'libfuzzer' ~/.claude/skills/'libfuzzer' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.
Badge for your README
The badge for onfire7777/universal-ai-skills-library shows the score of its lowest-scoring skill.

[](https://zalavijaysinh.github.io/skilltrust/repos/onfire7777/universal-ai-skills-library/)
Score history
| Date | Version | Score |
|---|
| 2026-11-08 | 2a76bf4 | 75 |