fix(providers): strip empty text blocks from API requests - #394
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prvnsmpth
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Jul 30, 2026
prvnsmpth
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- Anthropic and Bedrock providers now strip empty/whitespace-only text blocks from message content and tool results via the shared message adapter
- OpenAI provider skips empty text blocks when building response input items
- OpenAI-compatible provider skips empty text blocks inside tool result content (top-level was already guarded)
- Gemini, Vertex AI, and Azure Foundry were already handling this correctly or delegate to the fixed providers
- The fix prevents the Anthropic API's "text blocks must be non-empty" validation error that could occur when persisted conversation history accumulates empty text blocks through interrupted streams or empty tool results
- anthropic_message_adapter: filter empty/whitespace-only text blocks from content lists and tool_result content (fixes Anthropic + Bedrock) - openai: skip empty text blocks when building response input items - openai_compatible: skip empty text blocks in tool result content - Gemini already handled this; Vertex/Azure Foundry delegate to providers above so they're covered
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