AiError: Bad input when using Cloudflare Workers AI — message content format mismatch #30381

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1. github-actions

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   nexxeln

   on Jun 2, 2026
2. ulises-jeremias commented on Jun 3, 2026

   

   ulises-jeremias

   on Jun 3, 2026

   Last edited by ulises-jeremias

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   I’d like to take this one. I’ll trace the Cloudflare Workers AI request formatting path, reproduce the mixed message content shape (text string vs content array), and open a focused fix with regression tests.
3. ulises-jeremias commented on Jun 3, 2026

   

   ulises-jeremias

   on Jun 3, 2026

   Last edited by ulises-jeremias

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   Opened a fix PR with regression tests:

   • fix(provider): normalize cloudflare-workers-ai mixed message content #30589

   It normalizes Cloudflare Workers AI mixed message content shapes (string + text-part arrays) into a consistent string form when safe, while preserving tool/non-text arrays unchanged.
4. daton89 commented on Jun 10, 2026

   

   daton89

   on Jun 10, 2026

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   I've the same issue, @ulises-jeremias thanks for fixing it...
   when do you plan to release it?
5. ulises-jeremias commented on Jun 12, 2026

   

   ulises-jeremias

   on Jun 12, 2026

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   I've the same issue, @ulises-jeremias thanks for fixing it... when do you plan to release it?

   @nexxeln do you mind taking a look to this PR with the fix? #30589 👀
6. steelx commented on Jul 7, 2026

   

   steelx

   on Jul 7, 2026

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   any fix ?
7. steelx commented on Jul 14, 2026

   

   steelx

   on Jul 14, 2026

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   {
     "name": "AiError",
     "internalCode": 5006,
     "httpCode": 400,
     "message": "AiError: Bad input: Error: oneOf at '/' not met, 0 matches: required properties at '/' are 'prompt', Type mismatch of '/messages/0/content', 'array' not in 'string', Type mismatch of '/messages/1/content', 'array' not in 'string', Type mismatch of '/messages/2/content', 'string' not in 'array', required properties at '/messages/2' are 'role,content', oneOf at '/' not met, 0 matches, required properties at '/' are 'input', required properties at '/' are 'requests' (a8e8e150-2ec6-4022-8c54-71e8e72eec57)",
     "description": "Error: oneOf at '/' not met, 0 matches: required properties at '/' are 'prompt', Type mismatch of '/messages/0/content', 'array' not in 'string', Type mismatch of '/messages/1/content', 'array' not in 'string', Type mismatch of '/messages/2/content', 'string' not in 'array', required properties at '/messages/2' are 'role,content', oneOf at '/' not met, 0 matches, required properties at '/' are 'input', required properties at '/' are 'requests'",
     "requestId": "a8e8e150-2ec6-4022-8c54-71e8e72eec57"
   }
   
8. ulises-jeremias commented on Jul 14, 2026

   

   ulises-jeremias

   on Jul 14, 2026

   Last edited by ulises-jeremias

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   @steelx I just opened a new PR with the fix: #36850

   The previous PR (#30589) was closed by the automated cleanup bot due to age and lack of reactions, but the fix is the same — normalizing mixed content types for cloudflare-workers-ai messages.

   @nexxeln could you please take a look when you get a chance? Thanks!

   👍React with 👍1Reacted by Ajinkya Borade

   🎉React with 🎉1Reacted by Ajinkya Borade
9. steelx commented on Jul 17, 2026

   

   steelx

   on Jul 17, 2026

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   @steelx I just opened a new PR with the fix: #36850

   The previous PR (#30589) was closed by the automated cleanup bot due to age and lack of reactions, but the fix is the same — normalizing mixed content types for cloudflare-workers-ai messages.

   @nexxeln could you please take a look when you get a chance? Thanks!

   hey this looks good. and it gave me idea.. even if they dont approve PR we can use caveman like transformer here and inject it as plugin to enhance the output into string.
10. github-actions commented on Sep 17, 2026

    

    github-actionsBot

    on Sep 17, 2026 – with GitHub Actions

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    To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
11. github-actions

    closed this as not plannedon Sep 17, 2026
12. kawpii commented on Sep 27, 2026

    

    kawpii

    on Sep 27, 2026

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    Still get following with Cloudflare Workers AI:

    Bad Request: {"errors":[{"message":"AiError: Bad input: Error: oneOf at '/' not met, 0 matches: required properties at '/' are 'prompt', Type mismatch of '/messages/0/content', 'array' not in 'string', Type mismatch of '/messages/1/content', 'string' not in 'array', required properties at '/messages/1' are 'role,content', oneOf at '/' not met, 0 matches, required properties at '/' are 'input', required properties at '/' are 'requests' (802fcf5e-949a-4ad1-bf8b-608bb83ae5d6)","code":5006}],"success":false,"result":{},"messages":[]}
    

    Cloudlfare Workers Gateway did not work either.