Playwright's Screencast API Brings Video Verification to AI Agent Testing

AI agent testing has traditionally relied on opaque logs and traces that are difficult to verify and time-consuming to audit. Playwright's new Screencast API generates video evidence of agent sessions with semantic annotations and chapter markers, eliminating the need for manual trace interpretation. This shift directly impacts how QA teams investigate flaky tests, how product teams demonstrate agent reliability to stakeholders, and how security teams gather compliance-ready audit trails.