VAPI•2mo ago

GHL check calendar availability tool and the create appointment tool keep showing 400

Hey there, the GHL check calendar availability tool and the create appointment tool keep showing 400 errors on API error. I've checked, double-checked, triple-checked, reconnected, disconnected every single thing. Check the calendar IDs, everything the tools work, but it's not seeming to connect. What's going on?

Vapi Support BotAPP•10/29/25, 10:33 PM

Thanks for sharing the details! To help pinpoint the cause of the 400 errors, could you please check the Vapi dashboard's API logs and let me know if there is a specific error message or field mentioned in the log when the GHL tool fails? This will help identify if a required parameter (like calendarIdcalendarId or contactIdcontactId) is missing or invalid.

If you can share the exact error message from the logs, I can provide more targeted troubleshooting steps.

Sources:

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

developed-pinkOP•10/30/25, 3:23 PM

@Vapi Support Bot

message.txt9.81KB

developed-pinkOP•10/30/25, 4:02 PM

@Vapi Support Bot The above post is the tool log. It keeps saying there's no appointments and not pulling and it doesn't make any sense because I've checked and switched out to multiple calendars and all of them have availability

KyleAPP•10/31/25, 10:20 PM

Thanks for the tool log. We will take a look at it and get back to you soon

developed-pinkOP•11/1/25, 2:24 PM

@Duckie Any word guys, like I can't get this fixed. I've tried multiple times, I've deleted everything, and I've done everything and this is based on your GoHighLevel internal integration and it's not available to pull the calendar. I'm trying to figure out how to fix it. Does anybody have an answer? Is there a way to get support actually?

developed-pinkOP•11/1/25, 6:30 PM

@Duckie Getting this air - how are you guys even connected to this at all? :Get Duplicate Contact
{ "error": "MCP error -32602: MCP error -32602: Invalid arguments for tool get_duplicate_contact: [\n {\n "validation": "regex",\n "code": "invalid_string",\n "message": "Invalid",\n "path": [\n "phone"\n ]\n }\n]" }
11:30 AM

Response Details
{
"error": "MCP error -32602: MCP error -32602: Invalid arguments for tool get_duplicate_contact: [\n {\n "validation": "regex",\n "code": "invalid_string",\n "message": "Invalid",\n "path": [\n "phone"\n ]\n }\n]"

developed-pinkOP•11/2/25, 3:32 PM

@kyle ??

KyleAPP•11/5/25, 12:13 AM

Hi Aaron,

Thanks for the update. Could you please share the specific call ID where you encountered this error? That’ll help us review the logs and pinpoint what’s causing the 400 response.

Best,
Kyle

developed-pink•11/7/25, 1:14 PM

Hi Vapi team,

I’m facing the same issue other users have reported: GoHighLevel tools (check_availability and create_event) fail with 400 errors. I’ve already verified calendarId, contactId, and GHL connection, but the issue persists. The logs show “property output should not exist” or “Invalid arguments”.

Please confirm if this is the same known bug in the GHL tool integration reported since late October, and if there’s an ETA for the fix.

Call ID: 019a5dfa-1bd1-7778-9ef4-a308c39afba8

KyleAPP•11/18/25, 4:28 AM

I sincerely apologize for the delayed response to your support request.
We implemented better tracking for support tickets to ensure timely responses going forward, but due to a technical limitation, this only applies to tickets created after this past week.
I'm closing this older ticket, but if your issue still needs attention, please:
Reply with 'REOPEN' or
Email support@vapi.ai with any updates
I'll personally ensure your new request gets prompt attention.
Thank you for your patience.
Best regards,
Vapi Support Team

GHL check calendar availability tool and the create appointment tool keep showing 400

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