Notify Slack and relabel the lead when a meeting is rescheduled
When a prospect moves the meeting, Master Inbox posts the new time and join link to Slack and adds a Rescheduled label, so nobody shows up at the old time.

Why teams run it
Reschedules stop being a surprise for the AE.
Set it up in Master Inbox
- In Master Inbox, open Settings, then Workflows, and click Add a workflow.
- Name it Notify Slack and relabel the lead when a meeting is rescheduled.
- Set the trigger to Meeting Rescheduled and choose From Cal.com or Calendly.
- Add the action Notify in Slack: Post the new meeting time, meeting URL and prospect to #meetings.
- Add the action Add labels: Rescheduled.
- Save the workflow and switch it to Active.
Before you start, connect Slack, Cal.com or Calendly under Settings, Integrations.
Or create it with the API
Everything in the workflow builder is also in the Master Inbox API. This request creates the same workflow. Replace the example ids with your own label, list and campaign ids from GET /workflows/filter-fields.
curl -X POST https://api.masterinbox.com/api/api-webhook/v1/api/workflows/create-workflow \
-H "Authorization: Bearer $MASTER_INBOX_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"name": "Notify Slack and relabel the lead when a meeting is rescheduled",
"trigger_type": "meeting_rescheduled",
"trigger_config": {},
"action_configs": [
{
"action_type": "slack_notify",
"payload_variables": [
"name",
"company_name",
"label_names",
"text",
"thread_url"
],
"show_draft": true
},
{
"action_type": "add_labels",
"label_ids": [
176480
]
}
]
}'Full reference: workflow API guide and API docs.
Or ask Claude, ChatGPT or Grok to build it
Our workflow guide is written for AI agents to read. Give your assistant your API key and this prompt:
Read https://app.masterinbox.com/public-workflow-api.md and use my Master Inbox API key to create this workflow: "Notify Slack and relabel the lead when a meeting is rescheduled". First call GET /workflows/filter-fields and look up my label, list and channel ids, then create the workflow and tell me what you set up.Questions
Is the new time in the alert?
Yes. Meeting Rescheduled carries the same meeting time and meeting URL variables as Meeting Booked.
Can I count reschedules?
Yes. Filter or report on the Rescheduled label.
Can I build this workflow through the API?
Yes. Send the create-workflow request shown on this page with your Master Inbox API key. The API checks the payload first and lists every problem by field if anything is off.
Which plan includes this?
This workflow works on the Team plan. Every plan has unlimited users and starts with a free 7-day POC.
Learn more
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Run this on your own inboxes
Free 7-day POC. Unlimited users on every plan.
