Fix tool message content format for DeepSeek API compatibility #99
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−7
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DeepSeek API expects tool message content to be a string, not an array. Changed from .blocks() to .text() for tool messages. Also ensures structured tool outputs (JSON) are correctly serialized to JSON strings instead of using debug descriptions.
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This PR updates the serialization of
toolmessage content to comply with the OpenAI API specification (which requirescontentto be a string) and ensures compatibility with DeepSeek API (https://api-docs.deepseek.com/api/create-chat-completion content of a tool message must be a string ).Changes
toolmessage content from.blocks([...])(array) to.text(...)(string).StructuredSegment(JSON):ImageSegmentis converted to a placeholder string"<image>"as binary/image content cannot be represented in a plain string tool response.Impact
This fixes allows the library to work correctly with strict OpenAI-compatible APIs like DeepSeek.