How do I install the Foundry skill?

Run npx skillmds@latest add hairyf/foundry in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Foundry skill do?

Foundry — Forge, Cast, Anvil, Chisel; EVM tooling, cheatcodes, scripting, lint, debugging. It is listed under Coding & Dev Tools on SkillMD.

Is Foundry safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Foundry?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Foundry free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Foundry?

hairyf (@hairyf) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Foundry by hairyf — Agent Skill

Name: Foundry
Rating: 4.2 (5 reviews)
Author: hairyf

File contents

Skill based on Foundry (foundry-rs/foundry), generated 2026-02-09. User docs: https://getfoundry.sh, book: https://book.getfoundry.sh

Foundry is a fast, portable Ethereum dev toolkit (Rust): Forge (build, test, fuzz, deploy), Cast (EVM interaction), Anvil (local node), Chisel (Solidity REPL). This skill focuses on agent capabilities — architecture, cheatcodes, scripting, debugging, custom networks, and the linter — from the in-repo dev docs.

Core References

Topic	Description	Reference
Architecture	evm, config, cli crates; where cheatcodes and CLI live	core-architecture
Cheatcodes	Vm address, Inspector, adding cheatcodes, Cheatcode trait, JSON spec	core-cheatcodes
Config	foundry.toml, profiles, compiler, paths, remappings	core-config
Project layout	forge init, src, test, script, lib	core-project-layout

Features

Topic	Description	Reference
Forge build & test	forge build, forge test, snapshot, gas report, fuzz	features-forge-build-test
Forge fmt	forge fmt, [fmt] config, --check	features-forge-fmt
Contract size	forge build --sizes, 24KB limit	features-contract-size
Forge install	forge install, remappings, lib layout	features-forge-install
Scripting	forge script flow, broadcast, resume, nonce, multi-chain	features-scripting
Testing patterns	vm.prank, expectRevert, expectEmit, forge-std Test	features-testing-patterns
Coverage & verify	forge coverage, forge verify-contract	features-coverage-verify
Invariant testing	invariant_* functions, runs, depth, stateful fuzz	features-invariant
Fork testing	createSelectFork, selectFork, activeFork, multi-fork	features-fork-testing
FFI & signing	vm.ffi, vm.sign, EIP-712 helpers	features-ffi-signatures
State cheatcodes	vm.deal, vm.mockCall, vm.etch	features-state-cheatcodes
Cast	cast call, send, ABI encode/decode, chain queries	features-cast
Anvil	Local node, fork, pre-funded accounts, block time	features-anvil
Chisel	Solidity REPL for snippets and quick checks	features-chisel
Debugging	RUST_LOG, tracing filters for forge/cast/anvil	features-debugging
Custom Networks	Custom precompiles, evm-networks crate	features-networks
Lint (forge lint)	Early/late passes, adding lint rules, testing	features-lint

Best Practices

Topic	Description	Reference
Testing	Test layout, naming, isolation, CI patterns	best-practices-testing
Scripting	Broadcast, verify, resume, keys, multi-chain	best-practices-scripting

External Links

---name: foundrydescription: Foundry — Forge, Cast, Anvil, Chisel; EVM tooling, cheatcodes, scripting, lint, debugging.---> Skill based on Foundry (foundry-rs/foundry), generated 2026-02-09. User docs: https://getfoundry.sh, book: https://book.getfoundry.shFoundry is a fast, portable Ethereum dev toolkit (Rust): **Forge** (build, test, fuzz, deploy), **Cast** (EVM interaction), **Anvil** (local node), **Chisel** (Solidity REPL). This skill focuses on agent capabilities — architecture, cheatcodes, scripting, debugging, custom networks, and the linter — from the in-repo dev docs.## Core References| Topic | Description | Reference ||-------|-------------|-----------|| Architecture | evm, config, cli crates; where cheatcodes and CLI live | [core-architecture](references/core-architecture.md) || Cheatcodes | Vm address, Inspector, adding cheatcodes, Cheatcode trait, JSON spec | [core-cheatcodes](references/core-cheatcodes.md) || Config | foundry.toml, profiles, compiler, paths, remappings | [core-config](references/core-config.md) || Project layout | forge init, src, test, script, lib | [core-project-layout](references/core-project-layout.md) |## Features| Topic | Description | Reference ||-------|-------------|-----------|| Forge build & test | forge build, forge test, snapshot, gas report, fuzz | [features-forge-build-test](references/features-forge-build-test.md) || Forge fmt | forge fmt, [fmt] config, --check | [features-forge-fmt](references/features-forge-fmt.md) || Contract size | forge build --sizes, 24KB limit | [features-contract-size](references/features-contract-size.md) || Forge install | forge install, remappings, lib layout | [features-forge-install](references/features-forge-install.md) || Scripting | forge script flow, broadcast, resume, nonce, multi-chain | [features-scripting](references/features-scripting.md) || Testing patterns | vm.prank, expectRevert, expectEmit, forge-std Test | [features-testing-patterns](references/features-testing-patterns.md) || Coverage & verify | forge coverage, forge verify-contract | [features-coverage-verify](references/features-coverage-verify.md) || Invariant testing | invariant_* functions, runs, depth, stateful fuzz | [features-invariant](references/features-invariant.md) || Fork testing | createSelectFork, selectFork, activeFork, multi-fork | [features-fork-testing](references/features-fork-testing.md) || FFI & signing | vm.ffi, vm.sign, EIP-712 helpers | [features-ffi-signatures](references/features-ffi-signatures.md) || State cheatcodes | vm.deal, vm.mockCall, vm.etch | [features-state-cheatcodes](references/features-state-cheatcodes.md) || Cast | cast call, send, ABI encode/decode, chain queries | [features-cast](references/features-cast.md) || Anvil | Local node, fork, pre-funded accounts, block time | [features-anvil](references/features-anvil.md) || Chisel | Solidity REPL for snippets and quick checks | [features-chisel](references/features-chisel.md) || Debugging | RUST_LOG, tracing filters for forge/cast/anvil | [features-debugging](references/features-debugging.md) || Custom Networks | Custom precompiles, evm-networks crate | [features-networks](references/features-networks.md) || Lint (forge lint) | Early/late passes, adding lint rules, testing | [features-lint](references/features-lint.md) |## Best Practices| Topic | Description | Reference ||-------|-------------|-----------|| Testing | Test layout, naming, isolation, CI patterns | [best-practices-testing](references/best-practices-testing.md) || Scripting | Broadcast, verify, resume, keys, multi-chain | [best-practices-scripting](references/best-practices-scripting.md) |## External Links- [Foundry Docs](https://getfoundry.sh)- [Foundry Book](https://book.getfoundry.sh)- [foundry-rs/foundry GitHub](https://github.com/foundry-rs/foundry)- [Cheatcodes reference](https://book.getfoundry.sh/cheatcodes)

Frequently asked questions

Foundry