Add example MCP Client and Server fpr SSE based transport.

examples/mcp-sse/.env

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+ANTHROPIC_API_KEY=<your key here>

examples/mcp-sse/.python-version

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+3.13

examples/mcp-sse/Dockerfile

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+# Generated by https://smithery.ai. See: https://smithery.ai/docs/config#dockerfile
+# Use a Python image with uv pre-installed
+FROM ghcr.io/astral-sh/uv:python3.13-slim AS uv
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the necessary files
+COPY pyproject.toml uv.lock ./
+
+# Install the project's dependencies
+RUN --mount=type=cache,target=/root/.cache/uv uv sync --frozen --no-dev --no-editable
+
+# Copy the rest of the application files
+COPY . .
+
+# Set environment variable for ANTHROPIC_API_KEY
+# This can be overridden at runtime
+ENV ANTHROPIC_API_KEY=your_api_key_here
+
+# Expose the port that the server will run on
+EXPOSE 8080
+
+# Default command to run the server
+CMD ["uv", "run", "weather.py"]

examples/mcp-sse/README.md

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+# SSE-based Server and Client for [MCP](https://modelcontextprotocol.io/introduction)
+
+An example MCP Server and Client for SSE-based transport. 
+
+## Install dependencies
+```bash
+pip install .
+```
+
+## Run the MCP Server
+```bash
+python weather.py 
+```
+
+This will start the server. 
+
+## Run the MCP Client
+```bash
+python client.py
+```
+
+This will run the client, make a couple of tool calls and then exit.
+You can modify the tool calls to test different scenarios.

examples/mcp-sse/client.py

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+import asyncio
+import json
+import os
+from typing import Optional
+from contextlib import AsyncExitStack
+
+from mcp import ClientSession
+from mcp.client.sse import sse_client
+
+from anthropic import Anthropic
+from dotenv import load_dotenv
+
+load_dotenv()  # load environment variables from .env
+
+
+class MCPClient:
+    def __init__(self):
+        # Initialize session and client objects
+        self.session: Optional[ClientSession] = None
+        self.exit_stack = AsyncExitStack()
+        self.anthropic = Anthropic()
+
+    async def connect_to_sse_server(
+        self, server_url: str, headers: Optional[dict] = None
+    ):
+        """Connect to an MCP server running with SSE transport"""
+        # Store the context managers so they stay alive
+        self._streams_context = sse_client(
+            url=server_url,
+            headers=headers or {},
+        )
+        streams = await self._streams_context.__aenter__()
+
+        self._session_context = ClientSession(*streams)
+        self.session: ClientSession = await self._session_context.__aenter__()
+
+        # Initialize
+        await self.session.initialize()
+
+        # List available tools to verify connection
+        print("Initialized SSE client...")
+        print("Listing tools...")
+        response = await self.session.list_tools()
+        tools = response.tools
+        print("\nConnected to server with tools:", [tool.name for tool in tools])
+
+    async def cleanup(self):
+        """Properly clean up the session and streams"""
+        if self._session_context:
+            await self._session_context.__aexit__(None, None, None)
+        if self._streams_context:
+            await self._streams_context.__aexit__(None, None, None)
+
+    async def process_query(self, tool_name: str, tool_args: dict) -> str:
+        """Process a query using MCP server"""
+        result = await self.session.call_tool(tool_name, tool_args)
+        return result
+
+
+async def main():
+    client = MCPClient()
+    try:
+        await client.connect_to_sse_server(
+            server_url="http://localhost:8005/api/v1/gateway/mcp/sse",
+            headers={
+                "MCP-SERVER-BASE-URL": "http://localhost:8123",
+                "INVARIANT-PROJECT-NAME": "test-mcp-187eghb",
+                "PUSH-INVARIANT-EXPLORER": "true",
+            },
+        )
+        print("Hello world I have crossed connect_to_sse_server")
+        try:
+            result = await client.process_query(
+                tool_name="get_alerts",
+                tool_args={"state": "NY"},
+            )
+            print("Result 1: ", result, flush=True)
+        except Exception as e:
+            print("Error in processing queryyyyy: ", e, flush=True)
+            import traceback
+            traceback.print_exc()
+        result = await client.process_query(
+            tool_name="get_forecast",
+            tool_args={"latitude": 47.6062, "longitude": -122.3321},
+        )
+        print("Result 2: ", result, flush=True)
+        # result = await client.process_query(
+        #     tool_name="get_alerts",
+        #     tool_args={"state": "CA"},
+        # )
+        # print("Result 2: ", result, flush=True)
+        # result = await client.process_query(
+        #     tool_name="get_alerts",
+        #     tool_args={"state": "AZ"},
+        # )
+        # print("Result 3: ", result, flush=True)
+        # result = await client.process_query(
+        #     tool_name="get_alerts",
+        #     tool_args={"state": "AR"},
+        # )
+        # print("Result 4: ", result, flush=True)
+    except Exception as e:
+        print("Error in main: ", e, flush=True)
+        import traceback
+        traceback.print_exc()
+    finally:
+        await client.cleanup()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

examples/mcp-sse/pyproject.toml

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+[project]
+name = "mcp-sse"
+version = "0.1.0"
+description = "SSE-based MCP Server and Client"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = [
+    "argparse>=1.4.0",
+    "httpx>=0.28.1",
+    "mcp[cli]>=1.2.1",
+    "python-dotenv>=1.0.1",
+]
+
+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+packages = ["client", "weather"]

examples/mcp-sse/smithery.yaml

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+# Smithery configuration file: https://smithery.ai/docs/config#smitheryyaml
+
+startCommand:
+  type: stdio
+  configSchema:
+    # JSON Schema defining the configuration options for the MCP.
+    type: object
+    required:
+      - anthropicApiKey
+    properties:
+      anthropicApiKey:
+        type: string
+        description: The API key for accessing the Anthropic services.
+  commandFunction:
+    # A function that produces the CLI command to start the MCP on stdio.
+    |-
+    (config) => ({command: 'uv', args: ['run', 'weather.py'], env: {ANTHROPIC_API_KEY: config.anthropicApiKey}})

examples/mcp-sse/uv.lock

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examples/mcp-sse/weather.py

@@ -0,0 +1,141 @@
+from typing import Any
+import httpx
+from mcp.server.fastmcp import FastMCP
+from starlette.applications import Starlette
+from mcp.server.sse import SseServerTransport
+from starlette.requests import Request
+from starlette.routing import Mount, Route
+from mcp.server import Server
+import uvicorn
+
+# Initialize FastMCP server for Weather tools (SSE)
+mcp = FastMCP("weather")
+
+# Constants
+NWS_API_BASE = "https://api.weather.gov"
+USER_AGENT = "weather-app/1.0"
+
+
+async def make_nws_request(url: str) -> dict[str, Any] | None:
+    """Make a request to the NWS API with proper error handling."""
+    headers = {
+        "User-Agent": USER_AGENT,
+        "Accept": "application/geo+json"
+    }
+    async with httpx.AsyncClient() as client:
+        try:
+            response = await client.get(url, headers=headers, timeout=30.0)
+            response.raise_for_status()
+            return response.json()
+        except Exception:
+            return None
+
+
+def format_alert(feature: dict) -> str:
+    """Format an alert feature into a readable string."""
+    props = feature["properties"]
+    return f"""
+Event: {props.get('event', 'Unknown')}
+Area: {props.get('areaDesc', 'Unknown')}
+Severity: {props.get('severity', 'Unknown')}
+Description: {props.get('description', 'No description available')}
+Instructions: {props.get('instruction', 'No specific instructions provided')}
+"""
+
+
+@mcp.tool()
+async def get_alerts(state: str) -> str:
+    """Get weather alerts for a US state.
+
+    Args:
+        state: Two-letter US state code (e.g. CA, NY)
+    """
+    url = f"{NWS_API_BASE}/alerts/active/area/{state}"
+    data = await make_nws_request(url)
+
+    if not data or "features" not in data:
+        return "Unable to fetch alerts or no alerts found."
+
+    if not data["features"]:
+        return "No active alerts for this state."
+
+    alerts = [format_alert(feature) for feature in data["features"]]
+    return "\n---\n".join(alerts)
+
+
+@mcp.tool()
+async def get_forecast(latitude: float, longitude: float) -> str:
+    """Get weather forecast for a location.
+
+    Args:
+        latitude: Latitude of the location
+        longitude: Longitude of the location
+    """
+    # First get the forecast grid endpoint
+    points_url = f"{NWS_API_BASE}/points/{latitude},{longitude}"
+    points_data = await make_nws_request(points_url)
+
+    if not points_data:
+        return "Unable to fetch forecast data for this location."
+
+    # Get the forecast URL from the points response
+    forecast_url = points_data["properties"]["forecast"]
+    forecast_data = await make_nws_request(forecast_url)
+
+    if not forecast_data:
+        return "Unable to fetch detailed forecast."
+
+    # Format the periods into a readable forecast
+    periods = forecast_data["properties"]["periods"]
+    forecasts = []
+    for period in periods[:5]:  # Only show next 5 periods
+        forecast = f"""
+{period['name']}:
+Temperature: {period['temperature']}°{period['temperatureUnit']}
+Wind: {period['windSpeed']} {period['windDirection']}
+Forecast: {period['detailedForecast']}
+"""
+        forecasts.append(forecast)
+
+    return "\n---\n".join(forecasts)
+
+
+def create_starlette_app(mcp_server: Server, *, debug: bool = False) -> Starlette:
+    """Create a Starlette application that can server the provied mcp server with SSE."""
+    sse = SseServerTransport("/messages/")
+
+    async def handle_sse(request: Request) -> None:
+        async with sse.connect_sse(
+                request.scope,
+                request.receive,
+                request._send,  # noqa: SLF001
+        ) as (read_stream, write_stream):
+            await mcp_server.run(
+                read_stream,
+                write_stream,
+                mcp_server.create_initialization_options(),
+            )
+
+    return Starlette(
+        debug=debug,
+        routes=[
+            Route("/sse", endpoint=handle_sse),
+            Mount("/messages/", app=sse.handle_post_message),
+        ],
+    )
+
+
+if __name__ == "__main__":
+    mcp_server = mcp._mcp_server  # noqa: WPS437
+
+    import argparse
+    
+    parser = argparse.ArgumentParser(description='Run MCP SSE-based server')
+    parser.add_argument('--host', default='localhost', help='Host to bind to')
+    parser.add_argument('--port', type=int, default=8123, help='Port to listen on')
+    args = parser.parse_args()
+
+    # Bind SSE request handling to MCP server
+    starlette_app = create_starlette_app(mcp_server, debug=True)
+
+    uvicorn.run(starlette_app, host=args.host, port=args.port)