Sentinel is an autonomous incident-to-fix agent that orchestrates ticket understanding, codebase analysis, root cause detection, and patch generation across multiple specialized agents. The system ingests incidents from Jira, Slack, and GitHub Issues, processes them through a reasoning engine with documentation and error reference lookups, then generates minimal code patches with regression tests. Each agent stage outputs confidence scores and validation results, with fixes executed in a Docker sandbox environment before creating pull requests on GitHub. This architecture demonstrates how multi-agent systems can automate the entire incident lifecycle, reducing mean time to resolution and freeing DevOps teams from repetitive debugging tasks.