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fix(core): Filter empty content blocks from formatted prompts (#32519)

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Co-authored-by: Mason Daugherty <mason@langchain.dev>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Jacob Lee
2025-11-07 11:39:25 -08:00
committed by GitHub
parent d8b94007c1
commit 46971447df
2 changed files with 361 additions and 14 deletions
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28
libs/core/langchain_core/prompts/chat.py
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@@ -587,14 +587,15 @@ class _StringImageMessagePromptTemplate(BaseMessagePromptTemplate):
for prompt in self.prompt:
inputs = {var: kwargs[var] for var in prompt.input_variables}
if isinstance(prompt, StringPromptTemplate):
formatted: str | ImageURL | dict[str, Any] = prompt.format(**inputs)
content.append({"type": "text", "text": formatted})
formatted_text: str = prompt.format(**inputs)
if formatted_text != "":
content.append({"type": "text", "text": formatted_text})
elif isinstance(prompt, ImagePromptTemplate):
formatted = prompt.format(**inputs)
content.append({"type": "image_url", "image_url": formatted})
formatted_image: ImageURL = prompt.format(**inputs)
content.append({"type": "image_url", "image_url": formatted_image})
elif isinstance(prompt, DictPromptTemplate):
formatted = prompt.format(**inputs)
content.append(formatted)
formatted_dict: dict[str, Any] = prompt.format(**inputs)
content.append(formatted_dict)
return self._msg_class(
content=content, additional_kwargs=self.additional_kwargs
)
@@ -617,16 +618,15 @@ class _StringImageMessagePromptTemplate(BaseMessagePromptTemplate):
for prompt in self.prompt:
inputs = {var: kwargs[var] for var in prompt.input_variables}
if isinstance(prompt, StringPromptTemplate):
formatted: str | ImageURL | dict[str, Any] = await prompt.aformat(
**inputs
)
content.append({"type": "text", "text": formatted})
formatted_text: str = await prompt.aformat(**inputs)
if formatted_text != "":
content.append({"type": "text", "text": formatted_text})
elif isinstance(prompt, ImagePromptTemplate):
formatted = await prompt.aformat(**inputs)
content.append({"type": "image_url", "image_url": formatted})
formatted_image: ImageURL = await prompt.aformat(**inputs)
content.append({"type": "image_url", "image_url": formatted_image})
elif isinstance(prompt, DictPromptTemplate):
formatted = prompt.format(**inputs)
content.append(formatted)
formatted_dict: dict[str, Any] = prompt.format(**inputs)
content.append(formatted_dict)
return self._msg_class(
content=content, additional_kwargs=self.additional_kwargs
)