Add A2A Client for Connecting Agents (Including External Agents)

[s10gopal]

Overview

Introduce an Agent-to-Agent (A2A) client in LibreChat so it can connect to any A2A-compliant agent(server) —whether internal or external, and regardless of framework. This expands LibreChat’s role from hosting agents to also consuming and orchestrating agents across ecosystems.

Why A2A?

The A2A protocol is an open JSON-RPC standard for secure agent communication. It provides:

• Agent discovery via "Agent Cards"
• Multi-turn workflows and task delegation
• Streaming responses and asynchronous updates
• Framework-agnostic interoperability (LangChain, AutoGen, CrewAI, custom agents)

A2A is governed by the Linux Foundation, ensuring neutrality and long-term adoption.

Proposal

1. Add A2A client capabilities:

   • Discover and connect with A2A agents (local or remote)
   • Delegate tasks and coordinate workflows
   • Handle authentication, streaming, and async events

2. Support external & framework-agnostic agents:

   • No assumptions about runtime or framework
   • Any agent exposing A2A endpoints should be compatible

3. Extend configuration & UI:

   • Register A2A endpoints (librechat.yaml or Marketplace UI)
   • Provide simple controls to connect/disconnect agents

4. Combine with MCP:

   • Use MCP for tool and plugin integrations
   • Use A2A for agent-to-agent collaboration

Benefits

• Connect LibreChat with a wider agent ecosystem
• Enable framework-agnostic interoperability
• Support both internal and external agents seamlessly
• Position LibreChat as a universal multi-agent hub

References

• A2A Protocol: https://a2a-protocol.org/
• Linux Foundation Announcement: https://www.linuxfoundation.org/press/linux-foundation-launches-the-agent2agent-protocol-project-to-enable-secure-intelligent-communication-between-ai-agents