5 security tools every smart contract dev should be running:

1. Slither – static analyzer, catches low-hanging fruit fast
2. Echidna – fuzzer that breaks your assumptions
3. Foundry – testing framework that actually makes sense
4. Mythril – symbolic execution for deeper bugs
5. Semgrep – pattern matching for known exploits

One missed vuln = rekt treasury. Audits aren't enough if your code is already Swiss cheese.

Run these before you even think about mainnet.