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Add test for trailing assistant+system ordering, improve docstring

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Add test exercising the step 3 ordering where stripping a trailing
assistant exposes a system message that then gets converted to user.
Move the reasoning about when a trailing system message can occur
into the docstring.
This commit is contained in:
Paul Kompfner
2026-03-12 15:24:17 -04:00
parent 7f98cc9921
commit e69f5a76e1
2 changed files with 25 additions and 4 deletions
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10
src/pipecat/adapters/services/perplexity_adapter.py
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@@ -84,8 +84,11 @@ class PerplexityLLMAdapter(OpenAILLMAdapter):
"assistant", remove it. OpenAI appears to silently ignore trailing
assistant messages server-side, so removing them preserves equivalent
behavior while satisfying Perplexity's "last message must be
user/tool" constraint. If the last message is "system" (e.g. the
context only contains system messages), convert it to "user".
user/tool" constraint. If the last message is "system", convert it
to "user". A trailing system message can only occur when the context
consists entirely of system messages (possibly followed by assistant
messages that were just removed), because step 1 converts any system
message that appears after a non-system message to "user".
Args:
messages: List of message dicts with "role" and "content" keys.
@@ -144,8 +147,7 @@ class PerplexityLLMAdapter(OpenAILLMAdapter):
while messages and messages[-1].get("role") == "assistant":
messages.pop()
# If the last message is "system" (e.g. the context only contains
# system messages), convert it to "user".
# If the last message is "system", convert it to "user".
if messages and messages[-1].get("role") == "system":
messages[-1]["role"] = "user"