Agent Host ProtocolSynchronized multi-client state for AI agent sessions

microsoft.github.io · 2026-07-23 · by Long Nguyen ·generic
Documentation for the Agent Host Protocol — a synchronized, multi-client state protocol for AI agent sessions

Agent Host ProtocolSynchronized multi-client state for AI agent sessions

01 The problem

An agent session is stuck wherever it started.

The conversation, the turns, the pending tool approvals — they're tied to a single app or harness. Switch to another client, device, or automation and you can't pick up the same live session. AHP makes a session a shared resource, so it can live once and be driven from anywhere.

agent session

Stuck in one app

One live session, shared across clients

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