fix: filter empty text blocks before Anthropic API call#1806
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ThanhNguyxn wants to merge 1 commit intobytedance:mainfrom
Open
fix: filter empty text blocks before Anthropic API call#1806ThanhNguyxn wants to merge 1 commit intobytedance:mainfrom
ThanhNguyxn wants to merge 1 commit intobytedance:mainfrom
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Resolves bytedance#987 - Anthropic API returns 'text content blocks must be non-empty' error Root cause: When tool calls return null/undefined/empty results, the message conversion creates empty text blocks { type: 'text', text: '' } which violate Anthropic's API validation requirements. Solution: Add sanitizeEmptyTextBlocks() function that: - Filters out text blocks with empty or whitespace-only content - Preserves non-text blocks (images, tool_use, tool_result) - Adds '[No content]' placeholder if all content would be removed This fix is applied at the Anthropic handler level before sending messages to the API, ensuring the issue is handled at the source without modifying upstream message conversion logic.
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Summary
Resolves #987 - Fixes the "text content blocks must be non-empty" error when using Anthropic API.
Root Cause
When tool calls return null/undefined/empty results, the message conversion creates empty text blocks
{ type: 'text', text: '' }which violate Anthropic's API validation requirements.Solution
Added
sanitizeEmptyTextBlocks()function in the Anthropic handler that:[No content]placeholder if all content would be removedThe fix is applied at the Anthropic handler level before sending messages to the API, ensuring the issue is handled at the source without modifying upstream message conversion logic.
Changes
multimodal/tarko/llm-client/src/handlers/anthropic.ts: Added sanitization function and applied it to messages before API callTesting
pnpm buildin llm-client package succeeds{ type: 'text', text: '' }→ filtered{ type: 'text', text: ' ' }→ filtered[No content]placeholder