Check your calendar before saying yes in Slack
Have Notis check Cal free/busy availability when a channel proposes a specific meeting time, so the next reply is based on current availability.
Trigger
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Action
Check calendar availability
Retrieves free/busy availability for a specified calendar to aid scheduling without revealing event details; requires an existing, accessible calendar, noting that data granularity can vary.
Why this helps
Accepting a time in the middle of a busy conversation can create avoidable calendar conflicts.
- Adds a quick availability check to the decision point.
- Reduces calendar conflict risk from rapid Slack replies.
- Avoids revealing event details when free/busy is sufficient.
Setup
Build it in a few focused steps.
- 1Connect Slack and Cal to Notis once through the portal.
- 2Create an automation in the portal, or ask Notis in plain language to check Cal availability when a Slack channel message proposes a specific meeting time.
- 3Select Channel Message Received as the trigger and choose where run reports should go.
- 4Test with one real proposed time and confirm that the Cal calendar is accessible.
Questions about this workflow
Will the check show private event details?
The action retrieves free/busy availability without revealing event details.
Does checking availability book the time?
No. It only checks whether the calendar is available.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Cal. A trigger fires from one place; an action lands in another.
Slack triggers
Cal actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Add member to team
Adds a new member to a specified team within an organization by creating a team membership.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Add organization attribute option
Adds a new option to an organization's attribute, requiring a display `value` and a `slug` unique for that attribute.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Delete oauth client webhook
Permanently deletes a specific webhook subscription of an oauth client in the cal application, stopping its notifications.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Cancel booking via uid
Cancels an existing and active cal.com booking using its unique identifier (uid).
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Check calendar availability
Retrieves free/busy availability for a specified calendar to aid scheduling without revealing event details; requires an existing, accessible calendar, noting that data granularity can vary.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Check gcal synchronization status
Call this read-only action to verify the connection and synchronization status of a user's google calendar integration with cal.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Check ics feed calendar endpoint
Checks an ics feed url (expected as a query parameter) to verify its validity, accessibility, and icalendar data integrity.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Check Stripe status
Verifies if stripe is correctly connected to the cal scheduling system and functional for processing payments, reporting only on the integration's status.
Connect any two apps with Notis in the middle.
Slack and Cal, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
Save your first hour today.
7-day trial of any paid plan, with 20$ of usage included.
No card. Works with personal or business Cal.