来源: a2a-registry/browse Agent Card: https://llm-orchestration-agent-langchain-openai.getvda.ai/.well-known/agent-card.json A2A: https://llm-orchestration-agent-langchain-openai.getvda.ai/a2a/ LLM Orchestration Agent (Langchain Openai): composes langchain + langchain-openai + langgraph + langsmith + openai — orchestration, observability, llm-client via A2A + MCP.