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I have a simple Zap that uses Claude AI to summarize a Notion page and then send the summary to Slack. More often than not, the Claude step fails with this 529 error:


Anthropic Error (529): {"type":"error","error":{"type":"overloaded_error","message":"Overloaded"}}

 

I tried using Zapier error handling to introduce a “delay/retry” (screenshot below) but it still usually fails. I recognize that this isn’t a Zapier issue, but does anyone have any recommendations on how to improve this so that my Zap works more often than it fails?

 


  • What other details should I add here?
     
  • I have a Claude/Anthropic Professional Plan
  • The Zap does work occasionally
  • The page being summarize is not very big. 167 words
  • The delays are currently set for 2 minutes

Hi ​@grachtdog 

Check the Anthropic Status page: https://status.anthropic.com/

Past incidents: https://status.anthropic.com/#past-incidents

These incidents impact the Zap runs.

 

Until Anthropic has a more stable API, your Zap runs will likely continue to experience these errors, regardless of what type of logic you try to implement to limit the errors.

Thanks ​@Troy Tessalone for your response. You may be right, but it is still a very unsatisfying answer. I guess I was hoping for better guidance on how I could use Zapier tools to better mitigate the Anthropic shortcomings. 

It is exactly this sort of challenge that makes Zapier a “fun AI project toy” for me to experiment with rather than a system that I might rely on to get actual work done.

​@grachtdog 

Zapier has an Auto Replay feature.

That can to auto retry failed Zap Run steps automatically up to 5 times.

Info: https://help.zapier.com/hc/en-us/articles/19220226086797-What-is-replay#h_01H9KBC1HMW07HTC6EC7NBTENH

​@grachtdog 

A different approach would be to use a queue.

Apps like these can be used for the queue:

 

Concept would be to log each record you want to process into the table.

Then have a different Zap that picks a record from the table queue and tries to process the record.

  • If success, then delete the record and proceed to take the next record to process.
  • If failure, then update the record with the encountered error, add a delay (e.g. 1 hour), and have the Zap trigger again.

 

Could have the Zap configured to run every hour.

Could have the Zap configured to fire from a webhook.

Could have the Zap configured to fire from some other app trigger event.

 

NOTE: Since Anthropic’s API can have variable reliability it may take 0-N retries to get a record successfully processed thru a Zap Run.

Cool. I will check these out. Thank you ​@Troy Tessalone !

Have you considering using other models as a backup, in case anthropic returns a 529?

​@shakti-labs That’s not a bad idea. I will try that. Thanks

You're right—this isn't a Zapier issue directly. The 529 Overloaded Error from Claude AI means that Anthropic's servers are under heavy load and rejecting or delaying requests. However, there are some effective strategies you can try to reduce failures:

1. Add Multiple Retry Attempts with Incremental Delays

2. Use “Code by Zapier” for Smarter Retry Logic

3. Schedule the Zap at Low Traffic Times

4. Switch to a Different Claude Model

5. Check if Anthropic Offers Dedicated Capacity

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