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Fixed so only converted fastmcp types

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Josh Rubin 2025-09-30 14:59:44 -04:00
commit c82e1faa4e
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1 changed files with 12 additions and 7 deletions
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19
src/fastmcp/tools/tool.py
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@ -544,10 +544,15 @@ def _convert_to_content(
if all(isinstance(item, ContentBlock) for item in result):
return result
# Convert items that are not ContentBlocks
return [
_convert_to_single_content_block(item, serializer)
if not isinstance(item, ContentBlock)
else item
for item in result
]
# If any item is a ContentBlock, convert non-ContentBlock items to TextContent
# without aggregating them
if any(isinstance(item, (Image, Audio, File)) for item in result):
return [
_convert_to_single_content_block(item, serializer)
if isinstance(item, (Image, Audio, File))
else item
for item in result
]
# If none of the items are ContentBlocks, aggregate all items into a single TextContent
return [TextContent(type="text", text=_serialize_with_fallback(result, serializer))]