Which is more popular, A2A or MCP TypeScript SDK?

A2A has more GitHub stars (25,989 vs 13,501).

Which is more actively developed, A2A or MCP TypeScript SDK?

MCP TypeScript SDK had more commits in the last 90 days (84 vs 56).

Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.

Side-by-side comparison of two AI agent tools

A2A is growing faster: +496 GitHub stars in the last 30 days vs +237 for MCP TypeScript SDK.
Pick A2A for: agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic. Pick MCP TypeScript SDK for: the official TypeScript SDK for Model Context Protocol servers and clients.

From GitHub data refreshed daily.

A2Aopen-source

Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.

The official TypeScript SDK for Model Context Protocol servers and clients

+Standardized protocol enabling interoperability between different agentic systems regardless of implementation
+Strong community adoption with 22,866 GitHub stars and comprehensive multi-language documentation support
+Open source with Apache 2.0 license and Python SDK available on PyPI for easy integration

+Official SDK with comprehensive server and client libraries supporting multiple runtimes (Node.js, Bun, Deno)
+Includes middleware packages for popular frameworks (Express, Hono) enabling easy integration
+Strong community adoption with 12,000+ GitHub stars and active development

-May require significant refactoring of existing agent systems to adopt the protocol
-Potential performance overhead when routing communications through the protocol layer

-Version 2 is currently in pre-alpha development, making it unstable for production use
-Requires peer dependency on Zod v4 for schema validation, adding complexity to setup
-May be over-engineered for simple context provision scenarios that don't need full MCP protocol

•Multi-agent systems where specialized agents need to coordinate and share information across different platforms
•Enterprise environments with various AI tools that need to communicate and collaborate on complex workflows
•Distributed agent networks where agents from different organizations or vendors must interoperate

•Building MCP servers that provide tools, resources, and prompts to LLM applications
•Creating MCP clients that consume standardized context from various servers
•Integrating MCP capabilities into existing Express or Hono web applications

Which is more popular, A2A or MCP TypeScript SDK?: A2A has more GitHub stars (25,989 vs 13,501).
Which is more actively developed, A2A or MCP TypeScript SDK?: MCP TypeScript SDK had more commits in the last 90 days (84 vs 56).
Should I use A2A or MCP TypeScript SDK?: Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.