Turn a reaction into a clear confirmation
Use a meaningful reaction as a cue to summarize the marked message and what it appears to confirm.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Create Message
Tool to create a new message completion. use when you need to generate assistant text given a conversation history.
Why this helps
A reaction can signal agreement, approval, or acknowledgement without making the precise context easy to recall.
- Keeps the marked message's context with the apparent signal.
- Avoids treating every emoji as a formal approval.
- Creates a compact note for easier review.
Setup
Build it in a few focused steps.
- 1Connect Slack and Anthropic administrator to Notis once in the portal.
- 2Create an automation with a distinct name.
- 3Write one prompt asking Anthropic to summarize the reacted-to message and thread context and describe the reaction as a signal, not formal approval unless the message says so.
- 4Select Message Reaction Added, choose a channel for run reports, and test with one real reaction.
Questions about this workflow
Does every reaction mean approval?
No. The prompt should describe the reaction without upgrading it to formal approval.
Can the trigger be limited to a particular emoji?
The trigger supports optional filtering by channel and emoji name.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Anthropic administrator. A trigger fires from one place; an action lands in another.
Slack triggers
Anthropic administrator actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Create Message
Tool to create a new message completion. use when you need to generate assistant text given a conversation history.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Get Model
Tool to retrieve details of a specific model by its id. use after confirming the model id is valid.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
List models
Tool to list available models. use when you need to see which models are available before selection.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Prompt Caching
Tool to cache and reuse prompt content to reduce costs and latency. use after you have static prompt portions you intend to reuse across calls.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Connect any two apps with Notis in the middle.
Slack and Anthropic administrator, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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