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.

Source-backed Last updated May 15, 2026 1 source Needs local verification

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: May 15, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Anthropic API, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

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.

Diagnostic flow for this page

Match 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex exactly before applying the quick fix.
Compare the failing environment with Anthropic API versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex mean in Anthropic API?

413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex indicates the workflow described by "Anthropic Python SDK Bedrock/Vertex missing 413 and 529 error code mapping — retry logic silently broken" failed in a Anthropic API context. Start by confirming the exact signature and the component that emitted it.

What should I check first for 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex?

Check whether this cause matches your environment: 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.

Is the 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex guidance source-backed?

The "Anthropic Python SDK Bedrock/Vertex missing 413 and 529 error code mapping — retry logic silently broken" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex?

For "Anthropic Python SDK Bedrock/Vertex missing 413 and 529 error code mapping — retry logic silently broken", avoid applying "Reduce request pressure, check quota or plan limits, and retry with backoff instead of immediate repeated requests." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging 413 returns generic APIStatusError instead of RequestTooLargeError; 529 OverloadedError falls into InternalServerError on Bedrock/Vertex?

For "Anthropic Python SDK Bedrock/Vertex missing 413 and 529 error code mapping — retry logic silently broken", collect the failing Anthropic API command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.