a2a_agent_gatewayTier 1 · 70% confidence

ai-agents-a2a-agent-gateway-needing-to-invoke-agents-from-different-frameworks-9d747daf

agent: ai_agents

When does this happen?

IF Needing to invoke site_1 from different frameworks (LangGraph, Vertex AI, etc.) through a standardized protocol without custom proxying.

How others solved it

THEN Deploy the LiteLLM AI Gateway (proxy server) and register your site_1. Then use the A2A client to send messages to site_2 via the proxy, using the A2A protocol. The gateway handles routing, authentication, and key management, so your application can call any agent with a single API.

from a2a.client import A2AClient, A2ACardResolver; async with httpx.AsyncClient(headers={'Authorization':'Bearer sk-1234'}) as client: resolver = A2ACardResolver(httpx_client=client, base_url='http://localhost:4000/a2a/my-agent'); agent_card = await resolver.get_agent_card(); a2a_client = A2AClient(httpx_client=client, agent_card=agent_card); response = await a2a_client.send_message(SendMessageRequest(...))

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