Slither and Mythril: Static Analysis in CI/CD for Solidity

Frequently Asked Questions

01.What is the difference between Slither and Mythril?

Slither is a Solidity static analysis framework built on an intermediate representation called SlithIR, and it finishes a full scan of a typical contract in a few seconds without any transaction execution. Mythril is a symbolic execution engine that explores EVM bytecode paths to find deeper logic flaws such as integer issues and complex reentrancy chains, but a full symbolic run can take several minutes per contract. Most teams run Slither on every pull request for speed and Mythril on a slower nightly or pre-release schedule for depth.

02.How do you add Slither to a GitHub Actions workflow?

Add a job step that installs slither-analyzer via pip inside a Python 3.8 or later container, then invoke crytic/slither-action from the GitHub Marketplace, pointing target at your contracts directory. Set fail-on to high so the job exits non-zero and blocks merge only on high-severity findings, keeping medium and informational findings visible in the log without stopping the pipeline. Cache the pip install step to keep run time under a minute on repeat builds.

03.Can Mythril run inside a CI pipeline without slowing down every build?

Yes, by scoping Mythril to a separate, slower-cadence job rather than running it on every commit. A common pattern runs Mythril's myth analyze command inside the official mythril/myth Docker image against only the contracts that changed in a pull request, with an execution timeout of 300 seconds per contract. Teams typically schedule a full-repository Mythril sweep nightly or before a release tag rather than on every push, since symbolic execution time grows with contract complexity.

04.How should a team triage findings from both tools without alert fatigue?

Map every finding to its SWC Registry identifier first, since both tools reference this shared classification and it lets you deduplicate overlapping reports from Slither and Mythril into a single ticket. Configure Slither's severity gate to block only on high-impact detectors while routing medium and low findings to a triage backlog reviewed weekly. Use a slither.config.json to suppress detectors that produce false positives for your specific architecture, documenting the suppression reason in the same commit so reviewers understand why a check was silenced.