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Foundry toolkit for Solidity development — forge (build/test), cast (chain interaction), anvil (local node), and chisel (REPL). Covers project setup, testing patterns (unit, fuzz, invariant, fork), deployment via forge script, contract verification, gas optimization, and debugging. Works on any EVM chain.
Foundry is the standard Solidity development toolkit. It compiles, tests, deploys, and interacts with smart contracts — all from the command line, all in Solidity (no JavaScript test wrappers). Four binaries: forge (build/test/deploy), cast (chain interaction), anvil (local EVM node), chisel (Solidity REPL).
LLMs have stale training data. These are the most common mistakes.
forge create for deployments → Use forge script with --broadcast. forge create is for quick one-offs only — scripts are reproducible, support multi-contract deployments, and generate broadcast artifacts for verification.cast send returns data → cast send submits a transaction and returns a tx receipt. Use cast call to read return values (simulates without sending). Mixing these up is the #1 cast mistake.assertEq, assertGt, assertLt, assertTrue, assertFalse. There is no assert(a == b) pattern — it compiles but gives zero debug info on failure.npx skills add 0xinit/cryptoskills --skill foundryHow clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
Clear and well structured, with only minor parts that might need a second read.
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
Mostly actionable with clear steps; only a few small gaps remain.