📖 The AI Tool Bible

A2A Protocol vs Claude Agent SDK

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
A2A Protocol
Agents
Claude Agent SDK
Agents
TaglineOpen standard for letting AI agents from different frameworks talk to each other.Anthropic's official SDK for building autonomous Claude agents.
CategoryAgentsAgents
PricingFree· Free and open source (Apache 2.0)Free· Free SDK; API usage billed at Claude rates
Model—Claude Opus / Sonnet
Editorial score—8.6 / 10
Use cases
multi-agent-systemsagent-interopcross-framework-agentsagent-orchestration
Claude agentstool useproduction
Pros
  • Backed by Linux Foundation with AWS, Google, Microsoft, IBM and others on the TSC
  • Official SDKs in Python, JS, Java, .NET, Go and Rust
  • Cleanly complements MCP rather than competing with it
  • Apache 2.0, no vendor lock-in or hosted dependency
  • Official, well-tested abstractions
  • Same primitives as Claude Code
  • Strong tool-use ergonomics
  • TypeScript + Python SDKs
Cons
  • A spec, not a product - you still have to build the agents
  • Standard is young and surface area is still evolving
  • Requires both ends to implement A2A to get value
  • Adoption outside founding vendors is still early
  • Claude-only
  • Newer than LangGraph/CrewAI
Websitea2a-protocol.orgdocs.claude.com
Pick A2A Protocol if
  • ✅ Backed by Linux Foundation with AWS, Google, Microsoft, IBM and others on the TSC
  • ✅ Official SDKs in Python, JS, Java, .NET, Go and Rust
  • ✅ Cleanly complements MCP rather than competing with it
  • ✅ Apache 2.0, no vendor lock-in or hosted dependency
Pick Claude Agent SDK if
  • ✅ Official, well-tested abstractions
  • ✅ Same primitives as Claude Code
  • ✅ Strong tool-use ergonomics
  • ✅ TypeScript + Python SDKs
Compare a different pair →