What happened?

In v0.3 almost all requests had metadata. Event push-related RPCs were extending TaskIDParams inheriting the metadata field from them.

In v1.0 only SendMessage request has it. The absence of metadata is especially problematic in CancelTaskRequest because in some sense it reaches the agent. It makes it harder to develop an extension which modifies agentic behavior if there's no way to influence request or response of event produced in response to cancelation request.

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