Fizz Convert
pashov/skills
Convert English-language properties in PROPERTIES.md (produced by the Fizz skill) into Solidity assertions inside the existing fuzz harness, then flip their checkboxes.
Generates Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts.
Install Fuzz Generator
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install alt-research2/SolidityGuard fuzz-generator --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .claude/skills/fuzz-generator && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .claude/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generatorType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install alt-research2/SolidityGuard fuzz-generator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .agents/skills/fuzz-generator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .agents/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install alt-research2/SolidityGuard fuzz-generator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .cursor/skills/fuzz-generator && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .cursor/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/alt-research2/SolidityGuard.git --path .claude/skills/solidity-guard/skills/fuzz-generator--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install alt-research2/SolidityGuard fuzz-generator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .gemini/skills/fuzz-generator && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .gemini/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install alt-research2/SolidityGuard fuzz-generatorInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .github/skills/fuzz-generator && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .github/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install alt-research2/SolidityGuard fuzz-generator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/alt-research2/SolidityGuard.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/solidity-guard/skills/fuzz-generator .opencode/skills/fuzz-generator && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "fuzz-generator" agent skill from https://github.com/alt-research2/SolidityGuard/tree/main/.claude/skills/solidity-guard/skills/fuzz-generator into .opencode/skills/fuzz-generator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fuzz-generator", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
fuzz-generator- GitHub stars
- 104
- Token cost
- ~763 tokens
- SKILL.md length
- 96 words
- Files
- 1
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Generates Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts.
- Works in 5 steps: Purpose → Foundry Invariant Tests → Echidna Properties → …
- Tasks that involve Fuzzing
- SKILL.md covers 1. Purpose, 2. Foundry Invariant Tests, 3. Echidna Properties and 4. Common Invariants, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Fuzz Generator is an agent skill from alt-research2/SolidityGuard. Generates Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts. Creates handler contracts, invariant assertions, and fuzzing configurations.
Its SKILL.md is about 760 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering Fuzzing and Smart contracts. It works with Solidity. The repository describes itself as: Solidity/EVM smart contract security auditor — 104 vulnerability patterns, 8 tools, 100% CTF + EVMBench benchmark (120/120).
When your agent uses it
- Tasks that involve Fuzzing
- Tasks that involve Smart contracts
Example prompts
- “Use the fuzz-generator skill to generate Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts”
- “/fuzz-generator”
Requirements
- Pre-approved tools (allowed-tools): Read, Grep, Glob, Write, Bash
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Purpose
- Foundry Invariant Tests
- Echidna Properties
- Common Invariants
- Running
What it can do on your machine
Read from SKILL.md and the folder at commit 35645e8. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadGrepGlobWriteBash
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are solidity, yaml and bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Fuzz Generator loads about 763 tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 96 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Grep, Glob, Write, Bash
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 96 words (~763 tokens).
“Generate comprehensive fuzz tests using Foundry and Echidna. Fuzz testing finds edge cases and invariant violations that manual review and static analysis miss.”
- name
- fuzz-generator
- allowed-tools
- Read, Grep, Glob, Write, Bash
Files
Just SKILL.md in .claude/skills/solidity-guard/skills/fuzz-generator of alt-research2/SolidityGuard.
Open the folder on GitHubat commit 35645e8
Compare with similar skills
Fuzz Generator next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Fuzz Generator this skillalt-research2/SolidityGuard | 104 | — | ~763 | Automated safety check: Notes | Custom licence | |
| Fizz Convertpashov/skills | 1.2k | 2 repos | ~3.7k | Automated safety check: Pass | MIT | |
| Stateful Invariant Testingaviggiano/security | 144 | — | ~2.8k | Automated safety check: Pass | MIT | |
| Property Based Testingtrailofbits/skills | 7.4k | — | ~1.1k | Automated safety check: Pass | CC-BY-SA-4.0 | |
| Fizzpashov/skills | 1.2k | 2 repos | ~11k | Automated safety check: Pass | MIT | |
| Fuzzing Patternsccashwell/evm-cortex | 131 | — | ~1.6k | Automated safety check: Pass | MIT |
Similar skills
Stateful Invariant Testing
aviggiano/security
Build metric-driven Chimera/create-chimera-app stateful invariant testing campaigns for Solidity projects.
- Official
Property Based Testing
trailofbits/skills
Writes, reviews, and debugs property-based tests — Hypothesis, fast-check, proptest, jqwik, rapid, and Echidna or Medusa for Solidity invariants.
Fizz
pashov/skills
Generate Echidna/Medusa-compatible Solidity fuzz suites from Foundry or Hardhat projects.
Fuzzing Patterns
ccashwell/evm-cortex
A skill your agent uses when writing fuzz tests for Solidity contracts.
Smart Contract Audit
greatpie/smart-contract-audit-skill
Script-backed, out-of-box auditing workflow for Solidity/EVM repositories based on EVMbench detect/patch/exploit methodology.
More from alt-research2/SolidityGuard
Storage Analyzer
alt-research2/SolidityGuard
Analyzes storage layout, proxy patterns, and state variable security in Solidity contracts.
Entry Point Analyzer
alt-research2/SolidityGuard
Analyzes Solidity contract entry points to map attack surface.
Reentrancy Auditor
alt-research2/SolidityGuard
Deep reentrancy vulnerability analysis for Solidity contracts.
Report Generator
alt-research2/SolidityGuard
Generates professional security audit reports from findings.
Solidity Vulnerability Scanner
alt-research2/SolidityGuard
Comprehensive Solidity contract security scanner detecting 104 vulnerability patterns across reentrancy, access control, arithmetic, DeFi, proxy, and token categories.
Spec Compliance
alt-research2/SolidityGuard
Validates Solidity implementation against specification documents.
Related
Works with
Categories
Questions about Fuzz Generator
What does Fuzz Generator do?
Generates Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts. Fuzz Generator is an agent skill from alt-research2/SolidityGuard. Generates Foundry invariant tests and Echidna property-based fuzz tests for Solidity contracts.
When should I use Fuzz Generator?
Fuzz Generator fits situations like: tasks that involve Fuzzing; tasks that involve Smart contracts.
How do I install Fuzz Generator in Claude Code?
Run `npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a claude-code`. Or copy the skill folder (.claude/skills/solidity-guard/skills/fuzz-generator in alt-research2/SolidityGuard) into .claude/skills/fuzz-generator in your project. Claude Code loads it when a task matches its description.
How do I install Fuzz Generator in Codex?
Run `npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a codex`. Or copy the skill folder (.claude/skills/solidity-guard/skills/fuzz-generator in alt-research2/SolidityGuard) into .agents/skills/fuzz-generator in your project. Codex loads it when a task matches its description.
Can I use Fuzz Generator in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add alt-research2/SolidityGuard --skill fuzz-generator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fuzz-generator, .gemini/skills/fuzz-generator, .github/skills/fuzz-generator and .opencode/skills/fuzz-generator in your project.
What does Fuzz Generator need to run?
SKILL.md names no scripts, command-line tools or credentials: Fuzz Generator is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Grep, Glob, Write, Bash.
Does Fuzz Generator access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Fuzz Generator safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Fuzz Generator use?
Fuzz Generator has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Fuzz Generator use?
About 763 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Fuzz Generator?
Skills that share tags, products or a category with Fuzz Generator: Fizz Convert (pashov/skills, 1.2k stars), Stateful Invariant Testing (aviggiano/security, 144 stars), Property Based Testing (trailofbits/skills, 7.4k stars) and Fizz (pashov/skills, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fuzz Generator?
alt-research2 (a GitHub organization) maintains it in alt-research2/SolidityGuard, which has 104 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on June 12, 2026.
Source: alt-research2/SolidityGuard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.