AI agent authored each change, maintains per-agent trust scores over time, and routes pull requests through configurable policies. MergeShield supports automated actions such as auto-merging low-risk changes from trusted agents, enforcing approval workflows for high-risk diffs, and posting structured findings and action items back to GitHub. It is delivered primarily as a GitHub App, GitHub Action, REST API, and web dashboard, and can also be deployed in self-hosted environments for enterprise use.