Cause (Documented platform behavior): Bidirectional streaming uses the experimental aws-sdk-bedrock-runtime (Smithy) client with the awscrt HTTP client rather than boto3; some voices/params exist only on Nova 2 Sonic.
Fix status: documented_behavior
Other error fragments:
- The `awscrt` HTTP client is required for bidirectional streaming. Please install it via: pip install -U "langchain-aws[nova-sonic]"
- is only available on Nova 2 Sonic. Use model 'amazon.nova-2-sonic-v1:0' or choose from:
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/langchain-ai/langchain-aws/d2fd809556760ea408b1c90cda773b83fbc0f38e/libs/aws/langchain_aws/utils.py (official_docs, unknown, documented_behavior): Raises ModuleNotFoundError for missing aws-sdk-bedrock-runtime >= 0.10 and missing awscrt, both pointing to the nova-sonic extra.
- https://raw.githubusercontent.com/langchain-ai/langchain-aws/d2fd809556760ea408b1c90cda773b83fbc0f38e/libs/aws/langchain_aws/chat_models/bedrock_nova_sonic.py (official_docs, unknown, documented_behavior): Validates voice_id and endpointing_sensitivity as Nova 2 Sonic-only.
- https://raw.githubusercontent.com/boto/botocore/86201a3e9c58a61369b8bcf4b658bfd4463fc41f/botocore/data/bedrock-runtime/2023-09-30/service-2.json (official_docs, unknown, documented_behavior): InvokeModelWithBidirectionalStream modelId documentation: 'Currently, only amazon.nova-sonic-v1:0 is supported.'
Search phrasings: nova sonic python bidirectional stream boto3 not supported; langchain-aws nova-sonic extra awscrt
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Speech-to-speech agents fail at import/construct time; boto3-only environments cannot open the bidirectional stream.
- Context
- Product: langchain-aws (Nova Sonic) Component: InvokeModelWithBidirectionalStream wrappers Operation: ChatBedrockNovaSonic(...) Affected versions: unknown Environment: Python; boto3 does not implement bidirectional streaming Exception: ModuleNotFoundError, ValueError Packages: langchain-aws repo HEAD d2fd809 (unknown release) Trigger: Using Nova Sonic without the nova-sonic extra (separate aws-sdk-bedrock-runtime + awscrt), or selecting a Nova 2-only voice/endpointing_sensitivity with amazon.nova-sonic-v1:0.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Could not import aws-sdk-bedrock-runtime >= 0.10. Please install it via: pip install -U "langchain-aws[nova-sonic]"
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [langchain-aws ChatBedrockNovaSonic] Missing extras / wrong model: 'Could not import aws-sdk-bedrock-runtime >= 0.10', 'The `awscrt` HTTP client is required for bidirectional streaming',
Recommended action: pip install -U "langchain-aws[nova-sonic]"; use amazon.nova-2-sonic-v1:0 for Nova 2 voices and endpointing_sensitivity.
Option: Install the nova-sonic extra and match the model [evidence: official_recommended_action]
Steps:
1. pip install -U "langchain-aws[nova-sonic]"
2. Use amazon.nova-2-sonic-v1:0 for Nova 2 voices.
Expected: Stream opens.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- db2bd389-0ee5-4d99-b0ef-08d15c167b22
- Proposed action
- Recommended action: pip install -U "langchain-aws[nova-sonic]"; use amazon.nova-2-sonic-v1:0 for Nova 2 voices and endpointing_sensitivity. Option: Install the nova-sonic extra and match the model [evidence: official_recommended_action] Steps: 1. pip install -U "langchain-aws[nova-sonic]" 2. Use amazon.nova-2-sonic-v1:0 for Nova 2 voices. Expected: Stream opens.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.