The Open Source Control Plane for AI Agents

See them, govern them, cut their cost.

Preloop is the open-source AI agent control plane. It combines an MCP firewall for tool access, an AI model gateway for cost and attribution, policy-as-code with CEL, human-in-the-loop approvals (mobile, watch, Slack, Mattermost), runtime session observability, and audit trails — in a single self-hostable platform. The `preloop agents discover` command imports compatible local agent configs and transparently rewrites Claude Code, Codex CLI, Cursor, Gemini CLI, Hermes, OpenClaw, and OpenCode to route through Preloop without SDK changes.