microsoft/agent-host-protocol

What it solves

The Agent Host Protocol (AHP) addresses the challenge of managing AI agent sessions across different applications and environments. It provides a standardized way for multiple client applications to connect to an agent session server, ensuring that all connected clients see a synchronized, consistent view of the agent's state.

How it works

AHP operates as a communication protocol between a standalone session server and its clients. It uses a state-management architecture based on immutable state, pure reducers, and write-ahead reconciliation to ensure that session data remains consistent across all connected interfaces. The protocol supports multi-client connections, allowing users to interact with the same agent session from various tools simultaneously.

Who it’s for

This protocol is designed for developers building AI agent platforms, IDE extensions, or custom interfaces who need a reliable, cross-language way to expose agent sessions to multiple clients. It is particularly useful for those integrating agent capabilities into diverse environments like VS Code, terminal tools, or custom applications.

Highlights

• Standardized communication protocol for AI agent sessions.
• Multi-client support allowing synchronized views across different interfaces.
• Robust client SDKs available for Rust, TypeScript, Kotlin, Go, Swift, and .NET.
• Architecture based on immutable state and pure reducers for predictable state synchronization.
• Enables interoperability between various agent hosts and client applications.