Make reaction-marked Slack messages easier to find
Use a reaction as a lightweight signal that a Slack message belongs in a searchable collection.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Embed Content (Gemini)
Generates text embeddings using gemini embedding models. converts text into numerical vectors for semantic search, similarity comparison, clustering, and classification tasks.
Why this helps
Useful examples and decisions can be difficult to find later when they remain scattered across Slack.
- Create semantic representations of selected messages.
- Use a reaction to signal which messages matter.
- Support later similarity search or topic grouping.
Setup
Build it in a few focused steps.
- 1Connect Slack and Gemini to Notis once through the portal.
- 2Create an automation in the portal or ask Notis to embed messages when a chosen Slack reaction is added.
- 3Describe the intended message collection in one plain-language instruction.
- 4Select the Message Reaction Added trigger and choose a channel for run reports.
- 5Test with a real message that should belong in the collection.
Questions about this workflow
Does embedding save a searchable database by itself?
No. Embeddings are numerical representations; another system or workflow must store and use them for search.
Can I use any reaction as the signal?
Choose a reaction supported by the trigger's optional emoji-name filtering, if available.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Gemini. A trigger fires from one place; an action lands in another.
Slack triggers
Gemini actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Count Tokens (Gemini)
Counts the number of tokens in text using gemini tokenization. useful for estimating costs, checking input limits, and optimizing prompts before making api calls.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Download Video (Veo)
Downloads a generated veo video to local storage. takes the video uri from a completed operation and saves it to the specified file path.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Embed Content (Gemini)
Generates text embeddings using gemini embedding models. converts text into numerical vectors for semantic search, similarity comparison, clustering, and classification tasks.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Generate Content (Gemini)
Generates text content from prompts using gemini models. supports various models like gemini flash and pro with configurable temperature, token limits, and safety settings for diverse text generation tasks.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Generate Image (Gemini 2.5 Flash)
Generates images from text prompts using gemini 2.5 flash image preview model. supports creative image generation with customizable parameters like aspect ratio, safety settings, and optional file saving.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Generate Videos (Veo)
Generates videos from text prompts using google's veo models. creates high-quality video content with customizable aspect ratios, duration, and style controls. returns operation id for tracking progress.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Get Videos Operation (Veo)
Checks the status of a veo video generation operation. use the operation name from generatevideos to track progress and get the download url when complete.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
List Models (Gemini API)
Lists available gemini and veo models with their capabilities and limits. useful for discovering supported models and their features before making generation requests.
Connect any two apps with Notis in the middle.
Slack and Gemini, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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