fix: send null content for tool-only assistant messages#506
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robert-j-y merged 2 commits intoJun 10, 2026
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Assistant messages that contain only tool calls (no text) were sending `content: ""` which breaks AWS Bedrock Nova with "The text field in the ContentBlock object is blank." Send `content: null` instead. Fixes SDK-443 Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
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Description
Fixes SDK-443: Assistant messages that contain only tool calls (no text parts) were sending
content: ""(empty string), which breaks AWS Bedrock Nova withThe text field in the ContentBlock object ... is blank.The fix changes
content: texttocontent: text || nullin the assistant message handler ofconvertToOpenRouterChatMessages, so tool-only assistant messages emitcontent: nullinstead of an empty string. This matches the fix Vercel shipped for the same issue in@ai-sdk/openai-compatible.Checklist
pnpm stylecheckandpnpm typecheckpnpm testand all tests passChangeset
pnpm changesetto create a changeset fileMade with Cursor