MergeShield governs AI-generated code before it ships. It connects to GitHub and automatically analyzes every pull request from AI coding agents like Copilot, Cursor, Claude Code, and Devin - scoring risk across six dimensions in under 30 seconds. MergeShield tracks agent trust over time, auto-merges low-risk PRs from trusted agents, and holds high-risk changes for human review. Features include agent detection and trust scoring, configurable auto-merge rules, approval workflows with escalation, custom risk policies per repository, a GitHub Action for CI pipelines, real-time analytics dashboard, and a REST API with HMAC-signed webhooks.