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Fix: avoid empty system prompts (Perplexity Sonar 400) #137

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Fix: avoid empty system prompts (Perplexity Sonar 400) #137

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7 changes: 5 additions & 2 deletions core/agents/system_prompts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,9 @@ def add_project_pages(ctx: RunContext) -> str:

return instruction
else:
return ""
# Some providers (e.g. Perplexity Sonar) reject empty system messages.
# Return an explicit no-op instruction instead of an empty string.
return "No internal project pages were provided for linking. Do not add internal links unless explicit URLs are provided in context."


def add_title_details(ctx: RunContext[BlogPostGenerationContext]) -> str:
Expand Down Expand Up @@ -150,7 +152,8 @@ def add_target_keywords(ctx: RunContext[BlogPostGenerationContext]) -> str:
Don't make them bold, just a regular part of the text.
""" # noqa: E501
else:
return ""
# Some providers reject empty system messages; keep this non-empty.
return "No specific SEO focus keywords were provided."


def add_webpage_content(ctx: RunContext[WebPageContent]) -> str:
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3 changes: 2 additions & 1 deletion core/agents/title_suggestions_agent.py
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Expand Up @@ -51,7 +51,8 @@ def add_language_specification(ctx: RunContext[TitleSuggestionContext]) -> str:
@agent.system_prompt
def add_user_prompt(ctx: RunContext[TitleSuggestionContext]) -> str:
if not ctx.deps.user_prompt:
return ""
# Some providers reject empty system messages.
return "No additional user prompt was provided."

return f"""
IMPORTANT USER REQUEST: The user has specifically requested the following:
Expand Down