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feat(bedrock): add support for passing boto3.Session#1148

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Ashutosh0x wants to merge 3 commits intoanthropics:mainfrom
Ashutosh0x:feat/bedrock-boto3-session
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feat(bedrock): add support for passing boto3.Session#1148
Ashutosh0x wants to merge 3 commits intoanthropics:mainfrom
Ashutosh0x:feat/bedrock-boto3-session

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@Ashutosh0x Ashutosh0x commented Jan 22, 2026 •
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Fixes #538.

This PR adds support for passing a boto3.Session directly to the AnthropicBedrock and AsyncAnthropicBedrock clients.

Changes

  • Added aws_session parameter to Bedrock client constructors.
  • If provided, the session is used for region inference and request signing.
  • Updated get_auth_headers to accept and use the passed session.
  • Added safer handling of the connection header in _auth.py to prevent KeyError.

Verification

  • Verified with verify_bedrock_session.py using Mocks to ensure credentials and region are correctly extracted from the session.

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Feature: Support for access aws bedrock through role arn directly and retrieve the AKSK from boto3.Session directly

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