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fix(bedrock): filter empty text blocks from assistant messages

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Fixes #26554. When Claude's streamed responses are replayed via the
Anthropic /v1/messages → Bedrock Invoke path, empty text content blocks
({"type":"text","text":""}) from the leading content_block_start event
are preserved. Bedrock rejects these with "text field is blank".

Filter out empty text blocks from assistant messages before sending
to Bedrock, matching the existing guard in the Converse path.
This commit is contained in:
weiguangli-io 2026-04-27 19:42:48 +08:00
parent 3d2b8fed32
commit d958282f29
1 changed files with 20 additions and 0 deletions
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20
litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py
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@ -513,6 +513,26 @@ class AmazonAnthropicClaudeMessagesConfig(
normalize_tool_input_schema_types_for_bedrock_invoke(anthropic_messages_request)
ensure_bedrock_anthropic_messages_tool_names(anthropic_messages_request)
# 5b. Filter empty text blocks from assistant messages.
# Bedrock rejects {"type":"text","text":""} with:
# "The text field in the ContentBlock object is blank."
# These empty blocks come from Claude's streamed responses that emit
# a leading content_block_start with empty text.
# Ref: https://github.com/BerriAI/litellm/issues/26554
for msg in anthropic_messages_request.get("messages", []):
if msg.get("role") == "assistant" and isinstance(
msg.get("content"), list
):
msg["content"] = [
block
for block in msg["content"]
if not (
isinstance(block, dict)
and block.get("type") == "text"
and not block.get("text", "").strip()
)
]
# 6. AUTO-INJECT beta headers based on features used
anthropic_model_info = AnthropicModelInfo()
tools = anthropic_messages_optional_request_params.get("tools")