Slack gets notified the instant a new Notion subpage is created
Subpages in Notion are often used for child tasks, sub-project pages, or nested documentation. This automation posts them to Slack so your team discovers them without digging through the Notion hierarchy.
Trigger
Page Added to Page
Fires when a new subpage (a `child_page` type block) is added under a specified parent Notion page.
Action
Post message to channel
Deprecated: posts a message to a slack channel, direct message, or private channel. use `send message` instead.
Why this helps
Nested structures in Notion are powerful but invisible to team members who aren't actively exploring. New subpages for team tasks or shared docs get created and sit undiscovered for days.
- Team members see new subpages in Slack instead of needing to navigate Notion manually
- Child tasks and nested documentation are discovered immediately
- Encourages transparency about work being added under existing pages
- Reduces the cognitive load of maintaining mental maps of your Notion hierarchy
Setup
Build it in a few focused steps.
- 1Connect your Notion and Slack accounts to Notis.
- 2Create an automation with the prompt: 'When a new subpage is added under my main project page in Notion, post the subpage title and a link to it in the project Slack channel.'
- 3Select 'Page Added to Page' as your trigger and scope to a parent page you want to monitor.
- 4Specify the Slack channel for receiving these notifications.
- 5Test by creating a new subpage under your monitored parent page and confirm it appears in Slack.
Questions about this workflow
Can I monitor multiple parent pages at once?
Yes, by creating separate automations for each parent page you want to track. Or tell Notis 'for any project pages that have subpages added, post to the relevant project channel'.
What information shows up in the Slack notification?
The subpage title, creation timestamp, and a link to it. You can adjust your prompt to include or exclude details.
Does this work for deeply nested pages (grandchildren)?
The 'Page Added to Page' trigger catches immediate children. For deeper nesting, use the 'Page Created' trigger with optional scoping to a specific data source.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Notion to Slack. A trigger fires from one place; an action lands in another.
Notion triggers
Slack actions
All Page Events
Triggers when any Notion page is created or updated across the workspace.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Comment Created
Triggers when a new comment is created in Notion. Optional `page_id` filter scopes to comments on a specific page. When omitted, fires for any new comment in the workspace the integration has access to. Requires the 'Read comments' capability on the Notion integration. If a connection was authorized before that capability was enabled, the user must re-authorize the connection for comment events to flow.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
New Comment
Triggers when a new comment is added to a specified Notion block or page.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
Database Created
Triggers when a new Notion database (the container) is created. A database is the post-2025-09-03 container that holds one or more data sources. This trigger fires for the container's creation event (`database.created`), distinct from `NOTION_DATASOURCE_CREATED` which fires when a new data source is added to an existing database. Most customers calling Notion's `POST /v1/databases` (the legacy API) or creating a database via the Notion UI will see this event. Adding a new data source to an existing database fires `data_source.created` instead — use `NOTION_DATASOURCE_CREATED` for that. Notion's payload puts `entity.type: "block"` (the container is a `child_database` block in the content tree) and `entity.id` is the database id.
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
Data Source Created
Triggers when a new Notion data source is created. Fires workspace-wide. The payload's `data.parent` carries the data source's tree parent (typically the teamspace) for downstream filtering. A single template-based database creation can fire multiple `data_source.created` events at once — one per data source the template instantiates.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
Data Source Schema Updated
Triggers when a Notion data source's schema is updated. Fires on column add / remove / rename. Payload includes `data.updated_properties: [{id, name, action}]` so consumers can discriminate the kind of change downstream. Optional `data_source_id` filter scopes to schema changes on a single data source. When omitted, fires for any schema change in the workspace the integration has access to. Note: adding a column also fires `page.properties_updated` once per existing row in the data source. Customers wanting a single structural-change signal should use this trigger.
Add call participants
Registers new participants added to a slack call.
New Page
Triggers when a new page is added to a Notion database.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
Page Added to Page
Fires when a new subpage (a `child_page` type block) is added under a specified parent Notion page.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
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