diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | client.py | 153 | ||||
| -rw-r--r-- | main.py | 6 | ||||
| -rw-r--r-- | pyproject.toml | 2 | ||||
| -rw-r--r-- | uv.lock | 66 | ||||
| -rw-r--r-- | weather.py | 94 |
6 files changed, 316 insertions, 6 deletions
@@ -8,3 +8,4 @@ wheels/ # Virtual environments .venv +.env diff --git a/client.py b/client.py new file mode 100644 index 0000000..55b3b7e --- /dev/null +++ b/client.py @@ -0,0 +1,153 @@ +import asyncio +from typing import Optional +from contextlib import AsyncExitStack + +from mcp import ClientSession, StdioServerParameters +from mcp.client.stdio import stdio_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() + # methods will go here + async def connect_to_server(self, server_script_path: str): + """Connect to an MCP server + + Args: + server_script_path: Path to the server script (.py or .js) + """ + is_python = server_script_path.endswith('.py') + is_js = server_script_path.endswith('.js') + if not (is_python or is_js): + raise ValueError("Server script must be a .py or .js file") + + command = "python" if is_python else "node" + server_params = StdioServerParameters( + command=command, + args=[server_script_path], + env=None + ) + + stdio_transport = await self.exit_stack.enter_async_context(stdio_client(server_params)) + self.stdio, self.write = stdio_transport + self.session = await self.exit_stack.enter_async_context(ClientSession(self.stdio, self.write)) + + await self.session.initialize() + + # List available tools + response = await self.session.list_tools() + tools = response.tools + print("\nConnected to server with tools:", [tool.name for tool in tools]) + async def process_query(self, query: str) -> str: + """Process a query using Claude and available tools""" + messages = [ + { + "role": "user", + "content": query + } + ] + + response = await self.session.list_tools() + available_tools = [{ + "name": tool.name, + "description": tool.description, + "input_schema": tool.inputSchema + } for tool in response.tools] + + # Initial Claude API call + response = self.anthropic.messages.create( + model="claude-3-5-sonnet-20241022", + max_tokens=1000, + messages=messages, + tools=available_tools + ) + + # Process response and handle tool calls + final_text = [] + + assistant_message_content = [] + for content in response.content: + if content.type == 'text': + final_text.append(content.text) + assistant_message_content.append(content) + elif content.type == 'tool_use': + tool_name = content.name + tool_args = content.input + + # Execute tool call + result = await self.session.call_tool(tool_name, tool_args) + final_text.append(f"[Calling tool {tool_name} with args {tool_args}]") + + assistant_message_content.append(content) + messages.append({ + "role": "assistant", + "content": assistant_message_content + }) + messages.append({ + "role": "user", + "content": [ + { + "type": "tool_result", + "tool_use_id": content.id, + "content": result.content + } + ] + }) + + # Get next response from Claude + response = self.anthropic.messages.create( + model="claude-3-5-sonnet-20241022", + max_tokens=1000, + messages=messages, + tools=available_tools + ) + + final_text.append(response.content[0].text) + + return "\n".join(final_text) + + async def chat_loop(self): + """Run an interactive chat loop""" + print("\nMCP Client Started!") + print("Type your queries or 'quit' to exit.") + + while True: + try: + query = input("\nQuery: ").strip() + + if query.lower() == 'quit': + break + + response = await self.process_query(query) + print("\n" + response) + + except Exception as e: + print(f"\nError: {str(e)}") + + async def cleanup(self): + """Clean up resources""" + await self.exit_stack.aclose() + + +async def main(): + if len(sys.argv) < 2: + print("Usage: python client.py <path_to_server_script>") + sys.exit(1) + + client = MCPClient() + try: + await client.connect_to_server(sys.argv[1]) + await client.chat_loop() + finally: + await client.cleanup() + +if __name__ == "__main__": + import sys + asyncio.run(main())
\ No newline at end of file diff --git a/main.py b/main.py deleted file mode 100644 index c2c87a2..0000000 --- a/main.py +++ /dev/null @@ -1,6 +0,0 @@ -def main(): - print("Hello from weather!") - - -if __name__ == "__main__": - main() diff --git a/pyproject.toml b/pyproject.toml index 85aab48..5449f85 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -5,6 +5,8 @@ description = "Add your description here" readme = "README.md" requires-python = ">=3.12" dependencies = [ + "anthropic>=0.49.0", "httpx>=0.28.1", "mcp[cli]>=1.6.0", + "python-dotenv>=1.1.0", ] @@ -12,6 +12,24 @@ wheels = [ ] [[package]] +name = "anthropic" +version = "0.49.0" +source = { registry = "https://pypi.org/simple" } +dependencies = [ + { name = "anyio" }, + { name = "distro" }, + { name = "httpx" }, + { name = "jiter" }, + { name = "pydantic" }, + { name = "sniffio" }, + { name = "typing-extensions" }, +] +sdist = { url = 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"https://pypi.org/simple" } @@ -354,12 +416,16 @@ name = "weather" version = "0.1.0" source = { virtual = "." } dependencies = [ + { name = "anthropic" }, { name = "httpx" }, { name = "mcp", extra = ["cli"] }, + { name = "python-dotenv" }, ] [package.metadata] requires-dist = [ + { name = "anthropic", specifier = ">=0.49.0" }, { name = "httpx", specifier = ">=0.28.1" }, { name = "mcp", extras = ["cli"], specifier = ">=1.6.0" }, + { name = "python-dotenv", specifier = ">=1.1.0" }, ] @@ -0,0 +1,94 @@ +from typing import Any +import httpx +from mcp.server.fastmcp import FastMCP + +# Initialize FastMCP server +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) + +if __name__ == "__main__": + # Initialize and run the server + mcp.run(transport='stdio')
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