Google ADK 2.7.0 stops inferring model capabilities from the model id.

Models now declare their own capabilities, so an agent pairs an output schema with tools only when the model actually supports it. GitHub String-matching on model ids is the heuristic that silently breaks on every new release, and I've written it myself more than once. Tool function responses can now also carry images back to the model across Gemini, Anthropic, LiteLLM, Apigee and OCI.