fix(bedrock): add 'prompt is too long' to context window overflow mes… #1663
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…sages Claude Opus 4.6 via Bedrock returns a different error message when the context window is exceeded: "prompt is too long: 903884 tokens > 200000 maximum" This message was not recognized by the Bedrock provider, causing the agent to raise a raw ClientError instead of ContextWindowOverflowException. The Anthropic direct API provider already handles this message. Add "prompt is too long" to BEDROCK_CONTEXT_WINDOW_OVERFLOW_MESSAGES and add parametrized tests covering all overflow message variants.
afarntrog
approved these changes
Feb 11, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
Unshure
approved these changes
Feb 11, 2026
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Description
Claude Opus 4.6 via Bedrock returns a different error message when the context window is exceeded:
This message was not recognized by the Bedrock provider's
BEDROCK_CONTEXT_WINDOW_OVERFLOW_MESSAGESlist, causing the agent to raise a rawClientErrorinstead ofContextWindowOverflowException. This prevents the agent'sreduce_context()recovery mechanism from triggering.The Anthropic direct API provider already handles this message (
"prompt is too long:"inAnthropicModel.OVERFLOW_MESSAGES), but the Bedrock provider was missing it.Fix: Add
"prompt is too long"toBEDROCK_CONTEXT_WINDOW_OVERFLOW_MESSAGES.Related Issues
N/A
Documentation PR
N/A
Type of Change
Bug fix
Testing
Added a parametrized test (
test_stream_context_window_overflow) covering all 4 overflow message variants, including the new"prompt is too long"message.hatch run prepareResults: 1764 passed, 4 skipped, 0 failures.
Checklist
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