Anthropic API / Anthropic API
Anthropic Python SDK Bedrock/Vertex missing 413 and 529 error code mapping — retry logic silently broken
Fix Anthropic SDK Bedrock Vertex 413 529 error codes not mapped to typed exceptions retry backoff broken Includes evidence for Anthropic API troubleshooting demand.
- Category
- Anthropic API
- Error signature
413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex- Quick fix
- Reduce request pressure, check quota or plan limits, and retry with backoff instead of immediate repeated requests.
- Updated
What this error means
413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex is a Anthropic API failure pattern reported for developers trying to fix anthropic sdk bedrock vertex 413 529 error codes not mapped to typed exceptions retry backoff broken. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub PR #1544 in anthropics/anthropic-sdk-python fixes missing 413→RequestTooLargeError and 529→OverloadedError mappings on Bedrock and Vertex clients. The canonical client already maps these. Users on Bedrock/Vertex get generic APIStatusError for 413 and InternalServerError for 529, breaking retry/backoff code keyed off typed exceptions. Category mapped to Anthropic API — SDK drift bug affecting paid platform users.
Common causes
- GitHub PR #1544 in anthropics/anthropic-sdk-python fixes missing 413→RequestTooLargeError and 529→OverloadedError mappings on Bedrock and Vertex clients. The canonical client already maps these. Users on Bedrock/Vertex get generic APIStatusError for 413 and InternalServerError for 529, breaking retry/backoff code keyed off typed exceptions. Category mapped to Anthropic API — SDK drift bug affecting paid platform users.
Quick fixes
- Confirm the exact error signature matches
413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex. - Check the Anthropic API account, local tool state, and provider configuration involved in the failing workflow.
- Reduce request pressure, check quota or plan limits, and retry with backoff instead of immediate repeated requests.
Platform/tool-specific checks
- Verify the command, editor, extension, or API client that produced the error.
- Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
- Avoid deleting credentials, local model data, or project settings until the failing scope is clear.
Step-by-step troubleshooting
- Capture the exact error message and the command, editor action, or request that triggered it.
- Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
- Review the source evidence below and compare it with your environment.
- Apply one change at a time and rerun the smallest failing action.
- Keep the working fix documented for the team or deployment environment.
How to prevent it
- Keep provider/tool configuration documented.
- Record non-secret diagnostics such as tool version, provider name, model name, and command path.
- Add a lightweight check before CI or production workflows depend on the tool.
Sources checked
Evidence note: GitHub PR #1544 in anthropics/anthropic-sdk-python fixes missing 413→RequestTooLargeError and 529→OverloadedError mappings on Bedrock and Vertex clients. The canonical client already maps these. Users on Bedrock/Vertex get generic APIStatusError for 413 and InternalServerError for 529, breaking retry/backoff code keyed off typed exceptions. Category mapped to Anthropic API — SDK drift bug affecting paid platform users.
Related errors
- Anthropic API
FAQ
What should I check first?
Start with the exact 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex text and the smallest action that reproduces it.
Can I ignore this error?
No. Treat it as a failed Anthropic API workflow until the root cause is understood.
Is this guaranteed to have one fix?
No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.
How do I know the fix worked?
Rerun the same command, editor action, or request. The fix is working when that action completes without 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex.