A2A-MCP with langgraph and semantic kernel

### Is your feature request related to a problem? Please describe.

Hi, Right now the mcp A2A example available with Google ADK and i have been trying with langgraph to have mcp tools however it is not working as expected so can we have one such example on langgraph, may be existing langgraph code we can have mcp tools being linked.

### Describe the solution you'd like

A2A MCP with langgraph code.

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

The issue requests an example integrating MCP tools with LangGraph. First, examine existing A2A-MCP examples in the repository, likely in directories like 'examples/' or 'notebooks/'. Then, review the LangGraph documentation and the A2A protocol to understand how to expose MCP tools as nodes or tools within a LangGraph workflow. The goal is to produce a runnable sample notebook or script demonstrating the integration.

Escrita pelo modelo de indexação a partir do texto da issue.