diff --git a/changelog/3212.added.md b/changelog/3212.added.md
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+- Added to `AWSNovaSonicLLMService` functionality related to the new (and now
+  default) Nova 2 Sonic model (`"amazon.nova-2-sonic-v1:0"`):
+  - Added the `endpointing_sensitivity` parameter to control how quickly the
+    model decides the user has stopped speaking.
+  - Made the assistant-response-trigger hack a no-op. It's only needed for the
+    older Nova Sonic model.
diff --git a/changelog/3212.changed.md b/changelog/3212.changed.md
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+- Made `"amazon.nova-2-sonic-v1:0"` the new default model for `AWSNovaSonicLLMService`.
diff --git a/changelog/3212.fixed.md b/changelog/3212.fixed.md
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+- Fixed a bug in `AWSNovaSonicLLMService` where we would mishandle cancelled
+  tool calls in the context, resulting in errors.