Master Foundry Setup: Essential Tools for Solidity Developers and Auditors

The toolkit is built around four components: forge, cast, anvil, and chisel. Its relevance is not the command count. It is the removal of unnecessary context switching during contract development and testing.

The execution model is compact

Foundry is a smart contract development toolkit written in Rust. The guide positions it as an alternative for developers moving from Hardhat. The important distinction is where the test logic lives: Foundry keeps contracts and tests in Solidity, while the described Hardhat workflow uses Solidity for contracts and JavaScript for tests.

That difference affects the audit surface. A developer working in one language can inspect contract behavior without crossing into a second testing environment. The result is not automatically safer code. It is a more deterministic workflow with fewer unrelated layers between the test and the state mutation it evaluates.

The core tool is forge. It compiles contracts, runs tests, and deploys code. Most of the project lifecycle passes through it.

cast is the terminal interface for blockchain interaction. It can read contract state, send transactions, and decode calldata without requiring a separate application. For an auditor, this is the direct inspection layer: query the deployed state, construct an interaction, and examine the encoded call.

anvil provides a local blockchain. It runs on the developer’s machine and is described as a faster, built-in alternative to Ganache. This is where deployment and transaction behavior can be exercised before the contract reaches a public network.

chisel is a Solidity REPL. It executes Solidity code immediately, without requiring a new file. Its role is narrower but useful: isolate a calculation, inspect a type, or test a small expression before embedding it in a contract or test suite.

Project structure is part of the control surface

The guide covers both a new Foundry project and adding Foundry to an existing codebase. In the latter case, the --force flag initializes the project inside a directory that already contains files. The source states that existing code remains untouched while Foundry adds the structure it needs.

The resulting layout is explicit:

• src/ contains contracts.
• test/ contains tests.
• script/ contains deployment logic.
• lib/ contains installed libraries.

This is not cosmetic organization. It defines where state-changing code, verification logic, deployment paths, and dependencies are expected to live. For review work, that separation gives the auditor a fixed traversal order. Start with src/. Follow the tests in test/. Inspect deployment behavior in script/. Treat lib/ as an external dependency boundary.

The guide’s stated progression is similarly direct: install Foundry, create or initialize the project, understand the structure, then write the first test. It does not treat the toolkit as a collection of isolated commands. The objective is to make compilation, local execution, interaction, and testing one continuous workflow.

The security boundary is the test suite

The source makes the central invariant explicit: smart contracts cannot be treated like ordinary web applications. A deployed web application can receive a fix. A deployed contract can expose funds before any correction is possible. The guide therefore treats testing as mandatory, not optional.

That claim should be translated into an operational sequence:

1. Initialize a new project or add Foundry to an existing one.

2. Confirm the project layout and identify every contract under src/.

3. Write tests in test/ before treating deployment as complete.

4. Use anvil for local blockchain execution.

5. Use cast to inspect state, send transactions, and decode calldata.

6. Use chisel to isolate small Solidity behaviors before they become embedded logic.

7. Keep deployment code in script/ and dependencies in lib/.

The point is not to collect tools. It is to make each state transition observable. forge provides the build and test path. anvil provides execution. cast exposes contract interaction. chisel reduces small experiments to a controlled surface.

Foundry does not remove the need for threat modeling or invariant checks. It gives developers a compact environment in which those checks can be written and executed in Solidity. That is the practical substance of the Coinsbench guide: not a new abstraction over the EVM, but a tighter path from code to deterministic evidence.