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fix(anthropic): remove empty system messages from message list

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Empty system messages were skipped for Anthropic's system param but
not removed from the messages list, causing BadRequestError when
anthropic_messages_pt encountered the unsupported "system" role.

Fixes #21622
This commit is contained in:
Chesars 2026-02-19 21:46:17 -03:00
parent 2d39825868
commit 56386969b5
2 changed files with 3 additions and 5 deletions
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6
litellm/llms/anthropic/chat/transformation.py
View file

@ -1048,7 +1048,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
anthropic_system_message_list: List[AnthropicSystemMessageContent] = []
for idx, message in enumerate(messages):
if message["role"] == "system":
valid_content: bool = False
system_prompt_indices.append(idx)
system_message_block = ChatCompletionSystemMessage(**message)
if isinstance(system_message_block["content"], str):
# Skip empty text blocks - Anthropic API raises errors for empty text
@ -1068,7 +1068,6 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
anthropic_system_message_list.append(
anthropic_system_message_content
)
valid_content = True
elif isinstance(message["content"], list):
for _content in message["content"]:
# Skip empty text blocks - Anthropic API raises errors for empty text
@ -1092,10 +1091,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
anthropic_system_message_list.append(
anthropic_system_message_content
)
valid_content = True
if valid_content:
system_prompt_indices.append(idx)
if len(system_prompt_indices) > 0:
for idx in reversed(system_prompt_indices):
messages.pop(idx)

2
tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py
View file

@ -1739,6 +1739,8 @@ def test_translate_system_message_skips_empty_string_content():
# Empty system message should produce no anthropic content blocks
assert len(result) == 0
# System message must be removed from messages so it doesn't reach anthropic_messages_pt
assert all(m["role"] != "system" for m in messages)
def test_translate_system_message_skips_empty_list_content():