v0.3.0 v2.0.0
microsoft/agent-host-protocolJun 6, 2026 → Jun 10, 20263 days between releases
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Reading what changed between v0.3.0 and v2.0.0. This page updates automatically — usually within a minute.
The Two Releases
v0.3.0
AHP Swift Package v0.3.0
Jun 6, 2026· 5 months ago
Adds full MCP server lifecycle management and changeset operation status tracking.
Full release notesv2.0.0
ECC 2.0.0 — The Agent Harness Operating System
Jun 10, 2026· 5 months ago
v2.0.0 marks the stable graduation of ECC as a cross-harness operating system, enabling a unified environment for skills, rules, and hooks across multiple AI agents like Claude Code and Codex. It introduces a new control pane for session management and expands the ecosystem with 261 skills and 64 agents.
Full release notes