Introducing the Agent Governance Toolkit: Open-source runtime security for AI agents

Microsoft has released the open-source Agent Governance Toolkit (MIT license) to provide runtime security and governance for autonomous AI agents. The toolkit addresses all 10 OWASP Agentic AI Top 10 risks with sub-millisecond policy enforcement. It consists of seven packages that apply proven patterns from operating systems, service meshes, and SRE practices to AI agents, including a stateless policy engine (Agent OS), cryptographic identity and trust scoring (Agent Mesh), dynamic execution rings (Agent Runtime), SLOs and circuit breakers (Agent SRE), compliance verification (Agent Compliance), plugin supply-chain security (Agent Marketplace), and governance for RL training (Agent Lightning). The framework-agnostic toolkit works with LangChain, CrewAI, Microsoft Agent Framework, and others across Python, TypeScript, Rust, Go, and .NET. It is designed for incremental adoption and community stewardship, with over 9,500 tests and SLSA-compliant builds. 

https://opensource.microsoft.com/blog/2026/04/02/introducing-the-agent-governance-toolkit-open-source-runtime-security-for-ai-agents

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