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ACP (four protocols)

By Belgravia Labs Standards Observatory · Last verified · 4 primary sources

ACP refers to four distinct specifications from four groups across three steps of the map. In the agentic web, also known as Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol, it is implemented or referenced by Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol.

ACP refers to four distinct specifications from four groups across three steps of the map. Zed’s Agent Client Protocol connects code editors to coding agents (Act). AGNTCY’s Agent Connect Protocol (Cisco, LangChain, Outshift) defines an OpenAPI execution descriptor and REST runtime lifecycle for invoking remote agents (Act). IBM’s Agent Communication Protocol was an agent-to-agent messaging protocol, archived in August 2025 and merged into A2A (Coordinate, defunct). The OpenAI/Stripe Agentic Commerce Protocol lets an agent complete a checkout with a merchant (Pay). Published guides routinely state facts about one as though they applied to all; the widely repeated claim that "ACP merged into A2A" is true only of IBM’s.

Overview

ACP refers to four distinct specifications from four groups across three steps of the map. In the agentic web, also known as Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol, it is implemented or referenced by Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol.

Instances

Direct protocol probe: Not applicable (general term). Verified implementations across related standards:

Every instance with its source is listed on the instances page.

See also

References

  1. https://agentclientprotocol.com (2026-09-05) VERIFIED
  2. https://spec.acp.agntcy.org (2026-09-05) VERIFIED
  3. https://github.com/i-am-bee/acp (2025-08) VERIFIED
  4. https://github.com/agentic-commerce-protocol/agentic-commerce-protocol (2026-04-17) VERIFIED

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Frequently asked questions

What is ACP (four protocols)?
ACP refers to four distinct specifications from four groups across three steps of the map. In the agentic web, also known as Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol, it is implemented or referenced by Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol.
Which agentic web standards use ACP (four protocols)?
ACP (four protocols) is used or referenced by Agent Client Protocol, Agent Connect Protocol, Agent Communication Protocol, Agentic Commerce Protocol. See https://agenticweb.wiki/terms/acp/ for sourced definitions and verified implementations.
How is ACP (four protocols) verified on agenticweb.wiki?
The ACP (four protocols) record cites 4 primary specification or implementation sources and was last verified on 2026-10-30.