Foundry Deploy Fixtures

What it does

When your agent uses it

• Codex needs to separate Deploy.t.sol
• BaseFuzzTest.t.sol
• Deployment scripts
• Reusable fuzz bounds before adding unit

Example prompts

• “/foundry-deploy-fixtures”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Read AGENTS.md, Foundry config, existing tests, and deployment scripts.
2. 2Identify the minimum deployment graph needed by tests.
3. 3Create or refactor an abstract Deploy.t.sol that owns deployment only.
4. 4Keep Deploy.t.sol free of Test inheritance unless the repository already requires it.
5. 5Create or refactor BaseTest.t.sol so it extends Test and Deploy, calls deployment in setUp, and owns actors, funding, approvals…
6. 6Create or refactor BaseFuzzTest.t.sol so it extends BaseTest and owns bounds/generators.
7. 7Run focused tests, then the relevant suite.

What it can do on your machine

Read from SKILL.md and the folder at commit e18ce7d. 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

  No scripts in the folder and no shell commands in SKILL.md (its code samples are solidity).

  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

Foundry Deploy Fixtures loads about 634 tokens when it runs. Until then it costs about 80 tokens; SKILL.md has 250 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~80

When it runs · the whole SKILL.md, loaded when a task matches

~634

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

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

The full file from aviggiano/security at commit e18ce7d, republished under its MIT licence (© aviggiano). 250 words, ~634 tokens.

name

foundry-deploy-fixtures

description

Create or refactor Foundry deployment fixtures for Solidity tests. Use when Codex needs to separate Deploy.t.sol, BaseTest.t.sol, BaseFuzzTest.t.sol, deployment scripts, shared actors, token funding, approvals, and reusable fuzz bounds before adding unit, fuzz, property, or differential tests.

abstract contract Deploy {
    function deploy() internal virtual { ... }
}

abstract contract BaseTest is Test, Deploy {
    function setUp() public virtual {
        deploy();
        // fund, approve, register, deposit
    }
}

abstract contract BaseFuzzTest is BaseTest {
    function _boundAmount(uint256 seed) internal pure returns (uint256) { ... }
}

© aviggiano, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/foundry-deploy-fixtures of aviggiano/security.

• SKILL.md
• agents/openai.yaml

Open the folder on GitHubat commit e18ce7d