Cause (Documented platform behavior): Converse union shapes evolve; older botocore cannot deserialize new members.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/strands-agents/sdk-python/c56b7dea985c0c596ab021c46d3d4d15b4c35b67/strands-py/src/strands/models/bedrock.py (official_docs, unknown, documented_behavior): Logs this warning when SDK_UNKNOWN_MEMBER blocks are filtered from messages.
Search phrasings: SDK_UNKNOWN_MEMBER bedrock converse boto3; strands bedrock content blocks filtered upgrade boto3
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Citations, reasoning, search results or other new content silently disappear from history; model behavior degrades without errors.
- Context
- Product: Strands Agents SDK / boto3 Component: BedrockModel message cleaning Operation: Agent loop replaying Converse responses containing block types unknown to the installed botocore Affected versions: unknown Environment: Python, boto3/botocore older than the Bedrock feature in use Trigger: botocore's service model predates a Converse union member, so boto3 returns it as SDK_UNKNOWN_MEMBER; Strands filters those before resending.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Filtered out SDK_UNKNOWN_MEMBER content blocks from messages, consider upgrading boto3 version
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Strands Agents + old boto3] 'Filtered out SDK_UNKNOWN_MEMBER content blocks from messages, consider upgrading boto3 version' — new Converse block types silently dropped
Recommended action: Upgrade boto3/botocore to a release whose bedrock-runtime model includes the feature; pin minimum versions in requirements.
Option: Upgrade boto3/botocore [evidence: official_recommended_action]
Steps:
1. pip install -U boto3 botocore
Expected: New blocks round-trip.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- b1db0293-8ec4-4b4f-b9d6-8a67a760e1a3
- Proposed action
- Recommended action: Upgrade boto3/botocore to a release whose bedrock-runtime model includes the feature; pin minimum versions in requirements. Option: Upgrade boto3/botocore [evidence: official_recommended_action] Steps: 1. pip install -U boto3 botocore Expected: New blocks round-trip.
- 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.