fix: skip fine-grained-tool-streaming beta for older Claude 3 models on Bedrock

[roomote]

Related GitHub Issue

Closes: #11715

Description

This PR attempts to address Issue #11715. Feedback and guidance are welcome.

Problem: When using older Claude 3 models (Haiku, Opus, Sonnet, and the original 3.5 Sonnet 20240620) on AWS Bedrock, the fine-grained-tool-streaming-2025-05-14 beta flag is sent to all Claude models indiscriminately. These older models do not support this beta flag, causing Bedrock to reject the request with "invalid beta flag".

Fix: Added a BEDROCK_FINE_GRAINED_STREAMING_UNSUPPORTED_IDS constant listing the older Claude 3 model IDs that do not support the beta. The condition in bedrock.ts now checks that a Claude model is NOT in this exclusion list before adding the beta header.

Files changed:

• packages/types/src/providers/bedrock.ts - Added BEDROCK_FINE_GRAINED_STREAMING_UNSUPPORTED_IDS constant
• src/api/providers/bedrock.ts - Updated the condition to exclude older models from receiving the beta
• src/api/providers/__tests__/bedrock.spec.ts - Added tests verifying the beta is NOT sent for older models and IS still sent for newer models

Test Procedure

• Added 2 new test cases in bedrock.spec.ts:
  1. Verifies all 4 unsupported older Claude 3 models do NOT receive the fine-grained-tool-streaming beta
  2. Verifies newer Claude models (e.g. Claude 3.5 Sonnet v2) still receive the beta
• All 59 tests in bedrock.spec.ts pass
• All 16 tests in bedrock-native-tools.spec.ts pass
• All 6 tests in bedrock-reasoning.spec.ts pass
• Full lint and type-check pass across the monorepo

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes.
• Documentation Impact: No documentation updates are required.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

The excluded models are:

• anthropic.claude-3-haiku-20240307-v1:0
• anthropic.claude-3-opus-20240229-v1:0
• anthropic.claude-3-sonnet-20240229-v1:0
• anthropic.claude-3-5-sonnet-20240620-v1:0

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