# .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}\"
      }
    }
  }
}