Authors of accepted regular papers: you will be invited (but nor required) to submit the relevant artifact for evaluation by the artifact evaluation committee (AEC).
Authors of accepted tool papers: you will be required to submit your artifact to the AEC. Acceptance of tool papers will be conditional on successful artifact evaluation (unlike CAV 2020, authors of tool papers will not be required to submit an artifact along with the initial paper submission).
For provisionally accepted tool or regular papers, artifact evaluation will run in two phases:
Phase 1. Kick-the-tires phase (~1 week): reviewers will make sure that the artifact runs and report potential issues back to the authors.
Phase 2. Evaluation (~3 weeks): reviewers will evaluate artifacts.