Anthropic API / Anthropic API
Anthropic SDK — 413/529 Errors Not Mapped to Typed Exceptions on Bedrock/Vertex
Fix Anthropic Python SDK to properly handle 413 (payload too large) and 529 (overloaded) errors from Bedrock and Vertex providers Includes evidence for Anthropic API troubleshooting demand.
- Category
- Anthropic API
- Error signature
413 and 529 HTTP errors from Bedrock/Vertex not mapped to typed SDK exceptions- 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 and 529 HTTP errors from Bedrock/Vertex not mapped to typed SDK exceptions is a Anthropic API failure pattern reported for developers trying to fix anthropic python sdk to properly handle 413 (payload too large) and 529 (overloaded) errors from bedrock and vertex providers. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub anthropic-sdk-python#1544 (2026-05-14). PR maps 413/529 HTTP status codes to typed exceptions matching the canonical client behavior. Affects paying users on Bedrock/Vertex. Category mapping: Anthropic SDK → Anthropic API.
Common causes
- GitHub anthropic-sdk-python#1544 (2026-05-14). PR maps 413/529 HTTP status codes to typed exceptions matching the canonical client behavior. Affects paying users on Bedrock/Vertex. Category mapping: Anthropic SDK → Anthropic API.
Quick fixes
- Confirm the exact error signature matches
413 and 529 HTTP errors from Bedrock/Vertex not mapped to typed SDK exceptions. - 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 anthropic-sdk-python#1544 (2026-05-14). PR maps 413/529 HTTP status codes to typed exceptions matching the canonical client behavior. Affects paying users on Bedrock/Vertex. Category mapping: Anthropic SDK → Anthropic API.
Related errors
- Anthropic API
FAQ
What should I check first?
Start with the exact 413 and 529 HTTP errors from Bedrock/Vertex not mapped to typed SDK exceptions 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 and 529 HTTP errors from Bedrock/Vertex not mapped to typed SDK exceptions.