GHL check calendar availability tool and the creat...
# supporta
Aaron May
10/29/2025, 10:32 PMHey 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?
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Vapi Support Bot
10/29/2025, 10:34 PMThanks 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
calendarIdcontactIda
Aaron May
10/30/2025, 3:23 PMAaron May
10/30/2025, 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
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Chiranjeet Mishra
10/31/2025, 10:20 PMThanks for the tool log. We will take a look at it and get back to you soon
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Aaron May
11/01/2025, 2:24 PM@Vapi Support Bot 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?
Aaron May
11/01/2025, 6:30 PM@Vapi Support Bot 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]"
Aaron May
11/02/2025, 3:32 PM@kyle ??
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Chiranjeet Mishra
11/05/2025, 12:13 AMHi 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
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Jahim
11/07/2025, 1:14 PMHi 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
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