Web3 Testing
wshobson/agents
Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking.
Write Foundry tests, bulloak BTT tree specs, and Solidity scripts.
Install Foundry Testing
$ npx skills add sablier-labs/evm-monorepo --skill foundry-testing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sablier-labs/evm-monorepo foundry-testing --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/sablier-labs/evm-monorepo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/foundry-testing .claude/skills/foundry-testing && 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 "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .claude/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testingType 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 sablier-labs/evm-monorepo --skill foundry-testing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sablier-labs/evm-monorepo foundry-testing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sablier-labs/evm-monorepo.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/foundry-testing .agents/skills/foundry-testing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .agents/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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 sablier-labs/evm-monorepo --skill foundry-testing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sablier-labs/evm-monorepo foundry-testing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sablier-labs/evm-monorepo.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/foundry-testing .cursor/skills/foundry-testing && 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 "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .cursor/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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/sablier-labs/evm-monorepo.git --path .agents/skills/foundry-testing--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 sablier-labs/evm-monorepo --skill foundry-testing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sablier-labs/evm-monorepo foundry-testing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sablier-labs/evm-monorepo.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/foundry-testing .gemini/skills/foundry-testing && 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 "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .gemini/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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 sablier-labs/evm-monorepo foundry-testingInstalls 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 sablier-labs/evm-monorepo --skill foundry-testing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sablier-labs/evm-monorepo.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/foundry-testing .github/skills/foundry-testing && 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 "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .github/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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 sablier-labs/evm-monorepo --skill foundry-testing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sablier-labs/evm-monorepo foundry-testing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sablier-labs/evm-monorepo.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/foundry-testing .opencode/skills/foundry-testing && 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 "foundry-testing" agent skill from https://github.com/sablier-labs/evm-monorepo/tree/main/.agents/skills/foundry-testing into .opencode/skills/foundry-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "foundry-testing", 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
foundry-testing- GitHub stars
- 353
- Token cost
- ~2.9k tokens
- SKILL.md length
- 977 words
- Files
- 8 (incl. references)
- Skills in repo
- 6
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Write Foundry tests, bulloak BTT tree specs, and Solidity scripts.
- Works in 5 steps: Integration Tests (Concrete, BTT) → Fuzz Tests → Fork Tests → …
- Phrases - foundry testing
- SKILL.md covers Bundled References, Test Types, 1. Integration Tests… and 2. Fuzz Tests, plus 6 more sections
- Calls just and cargo; needs PRIVATE_KEY
What it does
Foundry Testing is an agent skill from sablier-labs/evm-monorepo. Write Foundry tests, bulloak BTT tree specs, and Solidity scripts. Trigger phrases - foundry testing, write test, write a tree, BTT spec, bulloak tree, Branching Tree Technique, fuzz test, fork test, invariant test, deploy script, gas benchmark, coverage, or when working in tests/ or scripts/ directories.
Its SKILL.md is about 2.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files, including reference files (for example `agents/openai.yaml`, `references/btt-examples.md` and `references/cheat-codes.md`).
It sits in Backend & APIs, covering Smart contracts and Test generation. It works with Solidity. The repository describes itself as: Monorepo for Sablier's EVM smart contracts including Lockup, Flow, Airdrops, Bob and Utils protocols.
When your agent uses it
- Phrases - foundry testing
- Branching Tree Technique
- Working in tests/
- Scripts/ directories
Example prompts
- “/foundry-testing”
Requirements
- A credential in PRIVATE_KEY
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Integration Tests (Concrete, BTT)
- Fuzz Tests
- Fork Tests
- Invariant Tests
- Solidity Scripts
What it can do on your machine
Read from SKILL.md and the folder at commit f317dc2. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
justcargo
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.comgetfoundry.sh
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
PRIVATE_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Foundry Testing loads about 2.9k tokens when it runs, and up to ~10k if it reads all its reference files. Until then it costs about 81 tokens; SKILL.md has 977 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 passed
The automated check found no risky patterns in SKILL.md.
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 977 words (~2,890 tokens).
“Rules and patterns for Foundry tests, bulloak .tree specs, and scripts. Find examples in the actual codebase.”
- name
- foundry-testing
Files
SKILL.md and 7 other files (references) in .agents/skills/foundry-testing of sablier-labs/evm-monorepo.
- SKILL.md
- agents/openai.yaml
- references/btt-examples.md
- references/cheat-codes.md
- references/gas-benchmarking.md
- references/invariant-patterns.md
- references/sablier-conventions.md
- references/test-infrastructure.md
Open the folder on GitHubat commit f317dc2
Compare with similar skills
Foundry Testing 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 |
|---|---|---|---|---|---|---|
| Foundry Testing this skillsablier-labs/evm-monorepo | 353 | — | ~2.9k | Automated safety check: Pass | Custom licence | |
| Web3 Testingwshobson/agents | 40k | 12 repos | ~2k | Automated safety check: Pass | MIT | |
| Fizz Convertpashov/skills | 1.2k | 2 repos | ~3.7k | Automated safety check: Pass | MIT | |
| Feynman Auditor0xiehnnkta/nemesis-auditor | 243 | 1 repos | ~11k | Automated safety check: Pass | MIT | |
| Smart Contract Auditgreatpie/smart-contract-audit-skill | 101 | — | ~1.1k | Automated safety check: Pass | None | |
| RadarAuditware/radar | 154 | — | ~2.1k | Automated safety check: Pass | GPL-3.0 |
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Script-backed, out-of-box auditing workflow for Solidity/EVM repositories based on EVMbench detect/patch/exploit methodology.
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Use radar for smart contract security analysis, AST generation, and detection template development.
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More from sablier-labs/evm-monorepo
Protocol Deployment
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Deploy Sablier protocols to a new EVM chain. An agent skill from sablier-labs/evm-monorepo.
Explorer Contract Verification
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Verify smart contracts on Etherscan, Routescan, and Blockscout block explorers.
Solidity Coding
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Write production-quality Solidity contracts. An agent skill from sablier-labs/evm-monorepo.
Audit
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Handbook
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Related
Works with
Categories
Questions about Foundry Testing
What does Foundry Testing do?
Write Foundry tests, bulloak BTT tree specs, and Solidity scripts. Foundry Testing is an agent skill from sablier-labs/evm-monorepo. Write Foundry tests, bulloak BTT tree specs, and Solidity scripts.
When should I use Foundry Testing?
Foundry Testing fits situations like: phrases - foundry testing; branching Tree Technique; working in tests/; scripts/ directories.
How do I install Foundry Testing in Claude Code?
Run `npx skills add sablier-labs/evm-monorepo --skill foundry-testing -a claude-code`. Or copy the skill folder (.agents/skills/foundry-testing in sablier-labs/evm-monorepo) into .claude/skills/foundry-testing in your project. Claude Code loads it when a task matches its description.
How do I install Foundry Testing in Codex?
Run `npx skills add sablier-labs/evm-monorepo --skill foundry-testing -a codex`. Or copy the skill folder (.agents/skills/foundry-testing in sablier-labs/evm-monorepo) into .agents/skills/foundry-testing in your project. Codex loads it when a task matches its description.
Can I use Foundry Testing 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 sablier-labs/evm-monorepo --skill foundry-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/foundry-testing, .gemini/skills/foundry-testing, .github/skills/foundry-testing and .opencode/skills/foundry-testing in your project.
What does Foundry Testing need to run?
Going by SKILL.md and its folder, Foundry Testing needs the command-line tools its instructions call (just and cargo) and credentials named PRIVATE_KEY. Our summary lists: A credential in PRIVATE_KEY.
Does Foundry Testing access the network?
SKILL.md names 2 domains. As links in the text: github.com and getfoundry.sh. This is read from the text; nothing was executed.
Is Foundry Testing safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Foundry Testing use?
Foundry Testing 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 Foundry Testing use?
About 2.9k tokens (SKILL.md is roughly 12k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.5k tokens, read only when the agent opens those files.
What are the alternatives to Foundry Testing?
Skills that share tags, products or a category with Foundry Testing: Web3 Testing (wshobson/agents, 40k stars), Fizz Convert (pashov/skills, 1.2k stars), Feynman Auditor (0xiehnnkta/nemesis-auditor, 243 stars) and Smart Contract Audit (greatpie/smart-contract-audit-skill, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Foundry Testing?
sablier-labs (a GitHub organization) maintains it in sablier-labs/evm-monorepo, which has 353 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 7, 2026.
Source: sablier-labs/evm-monorepo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.