CircleCI introduces Chunk, an autonomous validation agent designed to address the issue of flaky tests that often plague development teams. Instead of the common "rerun until green" approach, Chunk automates the process of identifying, analyzing, and fixing flaky tests by examining test history, pinpointing root causes, and submitting pull requests with verified fixes. The setup involves enabling Chunk within CircleCI, configuring its schedule, and preparing the test environment to ensure consistent execution. Users must have a CircleCI account, an active project with test results configured, and an API key from OpenAI or Anthropic. Chunk operates on a bring-your-own-key model, ensuring code security by keeping it within the user's chosen provider. Once operational, Chunk can handle tasks autonomously, running on a set schedule and providing real-time feedback on progress and results in the CircleCI web app. The system allows teams to document test conventions and adjust settings based on feedback to optimize performance. Chunk's integration enables developers to shift focus from tedious debugging to more strategic tasks, thus enhancing productivity and code reliability.