How agentic loops built on Sigma migrated 1,000+ tests to Playwright in a month

Sigma engineers used an agentic workflow to migrate more than 1,000 end-to-end tests from a legacy framework to Playwright in four weeks without a dedicated quality engineering team. The effort began by establishing reusable Playwright fixtures, page objects, authentication patterns, and parallelization practices, then encoding these standards into separate AI migration and review skills. For each test, agents translated the existing specification, ran it locally, submitted it to an independent adversarial review, and repeatedly executed it in CI with retries disabled to identify and correct root causes of instability before removing the original test. Sigma dashboards, Workbooks, Actions, and API connections tracked migration progress and enabled teams to trigger agent workflows through Cursor directly from the platform. The completed migration reportedly reduced test flakiness by 90%, saved 6,000 CI minutes weekly, improved debugging and feedback speed, and helped expose a previously overlooked intermittent production bug. Sigma plans to extend the approach toward automated acceptance-criteria generation, investigation, debugging, and self-healing test workflows.

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