The UUID of the Lightdash space where the chart should be saved. Spaces organize charts and dashboards for different teams or purposes.

To find available spaces:
1. Use the `list_spaces` tool to see all spaces with their IDs
2. Common space types:
   - `Shared` - Default space visible to all users
   - Department spaces - "Marketing", "Sales", "Finance"
   - Project spaces - For specific initiatives
   - Personal spaces - Individual user workspaces

If not specified, charts will be saved to the default space configured for your project.

Example space ID: `550e8400-e29b-41d4-a716-446655440000`