Fix/anthropic api compatibility#2603
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danielaskdd merged 2 commits intoHKUDS:mainfrom Jan 19, 2026
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…cking in stream response
Added hasattr check for 'text' attribute before accessing event.delta.text
Not all Delta events have a 'text' attribute (e.g., message_delta vs content_block_delta)
Fixes streaming response AttributeError and 400 BadRequest errors when using Anthropic Claude models.
… parameter instead of adding to messages array Anthropic API only accepts 'user' and 'assistant' roles in messages array. System prompts must be passed as a top-level parameter to messages.create()
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Description
Fixes Anthropic Claude API compatibility issues in the anthropic.py LLM adapter.
This PR addresses two bugs that prevent proper usage of Anthropic Claude models:
Changes Made
System prompt parameter fix (lines 103-126):
systemparameter tomessages.create()Error code: 400 - messages: Unexpected role "system"Delta attribute checking fix (line 138):
hasattr(event.delta, "text")check before accessingevent.delta.texttextattribute on their delta objectAttributeError: 'Delta' object has no attribute 'text'Checklist
Additional Notes
Testing performed:
claude-sonnet-4-5-20250929modelAPI Documentation Reference:
Breaking Changes: None - this is a bug fix that makes the adapter work as intended.
Compatibility: Compatible with all current Anthropic Claude models (Claude 3, Claude 3.5, Claude Opus 4.5, etc.)