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fix(clients): avoid empty text parts when encoding OpenAI message content #37

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fix(clients): avoid empty text parts when encoding OpenAI message content #37

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10 changes: 8 additions & 2 deletions src/stirrup/clients/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,18 +68,22 @@ def content_to_openai(content: Content) -> list[dict[str, Any]] | str:
content: Either a string or list of content blocks.

Returns:
List of content dictionaries in OpenAI format, or the original string
wrapped in a text content block.
List of content dictionaries in OpenAI format; a non-empty string is wrapped
as a single text part. Empty string/list with no parts becomes ``""``

Raises:
NotImplementedError: If an unsupported content block type is encountered.
"""
if isinstance(content, str):
if content == "":
return ""
return [{"type": "text", "text": content}]

out: list[dict[str, Any]] = []
for block in content:
if isinstance(block, str):
if block == "":
continue
out.append({"type": "text", "text": block})
elif isinstance(block, ImageContentBlock):
out.append({"type": "image_url", "image_url": {"url": block.to_base64_url()}})
Expand All @@ -97,6 +101,8 @@ def content_to_openai(content: Content) -> list[dict[str, Any]] | str:
out.append({"type": "file", "file": {"file_data": block.to_base64_url()}})
else:
raise NotImplementedError(f"Unsupported content block: {type(block)}")
if not out:
return ""
return out


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