fix(anthropic): filter out empty compaction blocks to prevent api rejection - #19990
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Description
Fixes #13335.
When using Anthropic's native compaction (
compact_20260112), the API occasionally returns a compaction block with empty/null content. Previously,@ai-sdk/anthropicpersisted this faithfully, which caused the Anthropic API to throw a 400 error (content can't be empty) when the message history was sent back on the next turn.This PR filters out compaction blocks with falsy/empty content during request building to prevent them from entering the payload sent to the API.
Testing