Is your feature request related to a problem? Please describe.

I am building out a A2A Card registry for my company, and require the ability to filter cards based on different properties, like organization, team etc. Today, the A2A card definition does not include the ability to provide arbitrary information about the agent itself, such as organization, or team level ownership. I say arbitrary, because in the future, the list of properties that we want to filter by will grow.

Describe the solution you'd like

I would like to add a metadata: dict[str, str] property to the agent card definition.

Describe alternatives you've considered

Create a wrapper object model around the A2A card definition in my private repository.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct