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

No

Describe the solution you'd like

An agent might have multiple tasks and as the client I would like to know what tasks are in progress, completed or failed.

Describe alternatives you've considered

Not an alternative, I think it will be beneficial just adding it to the official schema.

Additional context

I'm working on a command line debugger for A2A agents where I would like to know what tasks failed or succeed, in order to do it, I need to be able to fetch all tasks and check their current status and history.

I think it's an essential functionality - for example, what if an A2A client wants to know if there is already tasks in progress on the A2A-server so it would not submit a new one.

Code of Conduct

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