35 listed
Protocols & benchmarks
The standards and benchmarks behind agent tooling: MCP, A2A, Agent Skills, AGENTS.md and other protocols, plus benchmarks such as SWE-bench and Terminal-Bench. Protocol pages count the listings that use them; benchmark pages link to the official leaderboards.
Showing 1–9 of 9
- 0.867score
Agent2Agent Protocol (A2A)
Created by Google; contributed to the Linux Foundation
Open protocol for agents built on different frameworks and vendors to discover each other and collaborate on tasks.
ReferenceAFreshness: A★ 26.3K - 0.845score
AG-UI (Agent-User Interaction Protocol)
Originated at CopilotKit with LangChain and CrewAI as early partners
Event-based protocol that streams agent state, messages and tool calls between an agent backend and a user-facing app.
ReferenceAFreshness: A★ 16.8K - 0.835score
Model Context Protocol (MCP)
Created by Anthropic; stewarded by the MCP maintainers
Open JSON-RPC protocol that lets AI applications connect to external tools, data sources and prompts through MCP servers.
ReferenceAFreshness: A★ 9.5K - 0.819score
x402
Started at Coinbase; now stewarded by the x402 Foundation
Open payment standard that uses the HTTP 402 status code so clients, including agents, can pay per request.
ReferenceAFreshness: A★ 6.8K - 0.803score
Agent Client Protocol (ACP)
Created by Zed Industries
JSON-RPC protocol that lets any code editor run any coding agent, locally over stdio or remotely over HTTP.
ReferenceAFreshness: A★ 4.5K - 0.795score
Universal Commerce Protocol (UCP)
Google, developed with Shopify, Etsy, Wayfair, Target and Walmart
Open standard for agentic commerce covering discovery, checkout and post-purchase between platforms, agents and businesses.
ReferenceAFreshness: A★ 3.4K - 0.682score
Agent Payments Protocol (AP2)
Created by Google
Open protocol for agent-initiated payments, built as an extension to A2A and MCP, with signed user mandates.
ReferenceCFreshness: C★ 3.2K - 0.632score
Agentic Commerce Protocol (ACP)
OpenAI and Stripe
Open checkout standard from OpenAI and Stripe for buyers and AI agents to complete purchases with businesses.
ReferenceCFreshness: C★ 1.6K - 0.611score
Agent Network Protocol (ANP)
Agent Network Protocol (ANP)
Open protocol suite for agent identity, discovery and messaging on the open web, built on W3C DIDs.
ReferenceAFreshness: A★ 1.5K