# .parac/tools/custom/weather_tool.py
from pydantic import BaseModel, Field
from paracle_tools import Tool, ToolResult

class WeatherInput(BaseModel):
    """Input for weather tool."""
    location: str = Field(..., description="City name")
    units: str = Field(default="metric", description="Temperature units")

class WeatherTool(Tool):
    """Get current weather for a location."""

    name = "get-weather"
    description = "Get current weather conditions for a location"
    input_schema = WeatherInput

    async def execute(self, input_data: WeatherInput) -> ToolResult:
        """Execute weather lookup."""
        # Call external API
        weather_data = await fetch_weather_api(
            location=input_data.location,
            units=input_data.units,
        )

        return ToolResult(
            success=True,
            output=f"Temperature in {input_data.location}: {weather_data['temp']}",
            metadata=weather_data,
        )

# .parac/tools/registry.yaml
tools:
  - name: get-weather
    path: .parac/tools/custom/weather_tool.py
    class: WeatherTool
    enabled: true

  - name: web-search
    type: mcp
    server: search-mcp
    enabled: true

// .parac/mcp-servers.json
{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/workspace"]
    },
    "github": {
      "command": "mcp-server-github",
      "env": {
        "GITHUB_TOKEN": "${GITHUB_TOKEN}"
      }
    }
  }
}