use-or-subclass-existing-component

To subclass a Dagster integration component, create a Python subclass extending the base component class, then update your YAML configuration with the fully qualified type path so Dagster loads your custom implementation.

Enable demo_mode for API-based Dagster components when you need local testing without live external API connections. It allows you to validate configurations and align asset keys for downstream pipelines safely.

Discover available Dagster integration components by running uv run dg docs integrations or browsing the Dagster integrations documentation to find existing components you can load directly or subclass.

Validate Dagster component configurations and assets by running uv run dg check defs to verify definitions and uv run dg list defs to inspect components, ensuring your YAML schema is correct and asset keys are aligned.

Load a Dagster component directly via YAML if the default configuration meets your needs. Create a Python subclass if you must extend functionality or enable demo_mode for API-based components.

The safe subclass pattern for Dagster components involves creating a Python subclass, updating YAML with the fully qualified type, enabling demo_mode for API-based components, and validating with scaffold and check definitions steps.