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claude-code - 💡(How to fix) Fix [BUG] API Error: 529 {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"},"request_id":"req_0 [13 comments, 14 participants]

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anthropics/claude-code#45066•Fetched 2026-04-09 08:14:05
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I encountered an API error when using Claude Code in VSCode:

API Error: 529 { "type": "error", "error": { "type": "overloaded_error", "message": "Overloaded" }, "request_id": "req_0" }

It seems like the request failed due to server overload, but the extension did not retry or handle the error gracefully.

Error Message

API Error: 529 {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"},"request_id":"req_0

Root Cause

I encountered an API error when using Claude Code in VSCode:

API Error: 529 { "type": "error", "error": { "type": "overloaded_error", "message": "Overloaded" }, "request_id": "req_0" }

It seems like the request failed due to server overload, but the extension did not retry or handle the error gracefully.

Code Example

API Error: 529 {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"},"request_id":"req_0
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Description

I encountered an API error when using Claude Code in VSCode:

API Error: 529 { "type": "error", "error": { "type": "overloaded_error", "message": "Overloaded" }, "request_id": "req_0" }

It seems like the request failed due to server overload, but the extension did not retry or handle the error gracefully.

Environment

  • OS: Windows 10
  • VSCode version: (please fill)
  • Claude Code extension version: (please fill)
  • Model used: (e.g. claude-3.7-sonnet / opus / etc.)

Steps to reproduce

  1. Open VSCode
  2. Use Claude Code extension
  3. Send a prompt
  4. Receive API Error 529 overloaded_error

Expected behavior

The extension should either:

  • retry automatically, or
  • provide clearer guidance on retrying later

instead of returning a raw API error.

Additional context

Please confirm whether this is expected behavior when the Claude API is overloaded, or if retry logic should be handled by the extension.

What Should Happen?

When the API returns a 529 overloaded_error response, the extension should:

  • automatically retry the request with exponential backoff, or
  • provide a clear message indicating that the server is temporarily overloaded and the user should retry later

instead of returning a raw API error without guidance.

Error Messages/Logs

API Error: 529 {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"},"request_id":"req_0

Steps to Reproduce

  1. Open VSCode
  2. Launch Claude Code extension
  3. Send a prompt to the model
  4. The request fails with:

API Error: 529 { "type": "error", "error": { "type": "overloaded_error", "message": "Overloaded" } }

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.94

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

No response

extent analysis

TL;DR

The Claude Code extension should be modified to handle API Error 529 by implementing automatic retry with exponential backoff or providing clearer guidance on retrying later.

Guidance

  • The extension currently does not handle the "overloaded_error" response from the API, leading to a raw error message being displayed to the user.
  • To fix this, the extension could be updated to automatically retry the request with exponential backoff when it encounters an "overloaded_error" response.
  • Alternatively, the extension could provide a clear message to the user indicating that the server is temporarily overloaded and suggesting that they retry later.
  • The user can verify if the issue is resolved by checking if the extension now handles the "overloaded_error" response as expected.

Example

import time
import random

def send_request():
    # Send the request to the API
    response = api_request()
    if response.status_code == 529:
        # If the response is "overloaded_error", retry with exponential backoff
        retry_delay = 1
        for _ in range(5):
            time.sleep(retry_delay)
            response = api_request()
            if response.status_code != 529:
                break
            retry_delay *= 2
            retry_delay += random.uniform(0, 1)
        if response.status_code == 529:
            # If all retries fail, display a clear error message to the user
            print("The server is temporarily overloaded. Please try again later.")
    return response

Notes

The provided code snippet is a basic example of how the extension could implement automatic retry with exponential backoff. The actual implementation may vary depending on the specific requirements and constraints of the extension.

Recommendation

Apply workaround: The extension should be updated to handle the "overloaded_error" response by implementing automatic retry with exponential backoff or providing clearer guidance on retrying later. This will improve the user experience by reducing the likelihood of raw error messages being displayed and providing more informative error messages when necessary.

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FAQ

Expected behavior

The extension should either:

  • retry automatically, or
  • provide clearer guidance on retrying later

instead of returning a raw API error.

#api#embedding generation#cache error#pipeline error#runtime error

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