Agent2Agent (A2A)
Open protocol for agents to delegate to each other
Verdict
Reached 1.0 in March 2026 under the Linux Foundation. The right tool when another team owns the agent and you cannot see inside it, and needless overhead when you own both sides. Production use is still mostly in larger organisations.
Other AI Agents & Platforms
- OpenAI Responses APIProduction
OpenAI's current API for building agents — merges Chat Completions simplicity with Assistants-era tool use
- OpenAI Assistants APISuperseded
Managed agent platform with tools, files, and persistent threads — shut down in favour of the Responses API
- Claude MCP / Tool UseProduction
Anthropic's Model Context Protocol for universal tool integration
- Microsoft Copilot StudioProduction
Enterprise agent builder with Microsoft 365 and Azure integration
- AutoGenSuperseded
Microsoft's multi-agent conversation framework — succeeded by Microsoft Agent Framework
- CrewAIStable
Role-based multi-agent framework with simple, intuitive API