MCP with Langgraph and streaming

[apoorvkk]

When using mcp to get tools (on langgraph agent backend, not connecting to mcp directly from frontend) , how would one normally configure copilotkit_customize_config to help stream these mcp tool calls?

Example reference without mcp: https://github.com/CopilotKit/CopilotKit/blob/main/examples/coagents-research-canvas/agent/research_canvas/langgraph/chat.py#L37-L48

[apoorvkk]

Also why do we need a state key?