Getting Error validating Cal
# ❓・ai-evy-supportb
Bobster2002
12/14/2025, 9:51 PM@AI Evy Getting Error validating Cal.com tools, when creating simple calendar checking tools. Please help.
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AI Evy
12/14/2025, 9:51 PMThanks for tagging me @Bobster2002. I'll look through relevant sources and get back to you shortly.
AI Evy
12/14/2025, 9:51 PM### Answer
AI Evy
12/14/2025, 9:51 PMmessage has been deleted
AI Evy
12/14/2025, 9:51 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.
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Bobster2002
12/15/2025, 9:44 PM@AI Evy any updates?
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AI Evy
12/15/2025, 9:44 PMThanks for the follow-up, @Bobster2002. I'll get back to you soon.
AI Evy
12/15/2025, 9:44 PM### Answer
Based on similar reported issues, the "Error validating Cal.com tools" problem is most commonly caused by an expired Cal.com API key. [(1) ]()
Here's what to check:
1. Rotate/refresh your Cal.com API key – Go to your Cal.com dashboard → Settings → Developer → API Keys, and generate a new key. [(2) ]()
2. Update the API key in Retell – After getting a fresh key, update it in your Retell agent's Cal.com tool configuration. [(3) ]()
3. Verify Event Type ID – Ensure the Event Type ID you're using is correct and the event still exists in your Cal.com account.
4. Check phone number requirement – If your Cal.com event type requires a phone number, you'll need to disable that requirement, as Retell doesn't send the phone number field. [(4) ]() , [(2) ]()
If the issue persists after trying these steps, please share your agent ID so the support team can investigate further.
AI Evy
12/15/2025, 9:44 PM
To learn more, see the sources I considered:
[[1] Error validating Cal.com tools](https://discord.com/channels/1186424376300679209/1444993408727777391)
[[2] Error with Cal.com integration](https://discord.com/channels/1186424376300679209/1432628757067337778)
[[3] Check Calendar Availability](https://docs.retellai.com/build/check-availability)
[[4] Cal.com error validating tools](https://discord.com/channels/1186424376300679209/1432750783580999862)
AI Evy
12/15/2025, 9:44 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.