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- š§ How to build your own slack thread summarizer AI agent
š§ How to build your own slack thread summarizer AI agent
Built mine in under 30 minutes.
I didnāt announce it. I just built it.
An AI agent that quietly reads my Slack threads and emails me a daily summary.
No code. Took under 30 minutes.
Now I stay in the loop without chasing the thread.
Hereās the full setup. š
ā Build Your Own AI Agent in 7 Simple Steps
To set up your AI agent, weāll use Zapier, a no-code automation platform that lets you connect your favorite apps and create powerful AI workflows.
š¤ Step 1: Open Zapier & Enable Agents
Head to your Zapier dashboard
ā Find āAgentsā in the left menu
ā Click āCreate Custom Agentā
ā Name it something practical like āSlack Daily Summaryā
š„ļø Step 2: Explore the Agent Interface
Once the agent is created, you'll see its interface.
This displays all the behaviors (including those from previous agents, if any).
You can always return to check the agentās activity and progress.

Zapier: create your own custom agent
ā¶ļø Step 3: Create a New Behavior
Click āRun Behaviorā ā āCreate Behaviorā
This is where youāll tell the agent exactly what task it should perform.

Zapier AI: Create a Behavior
š®ļø Step 4: Set the Trigger
Click āAdd Triggerā and choose an app to start the workflow.
For this example, select Slack.
Set the trigger to āReaction Addedā (this means you can trigger the agent by adding an emoji reaction to any message)
Zapier: Set up the Trigger
š ļø Step 5: Define the Behavior
Write a simple prompt like this:
āWhen I react to a message, retrieve the entire Slack thread, summarize the key points and action items, and send the summary to my email.ā
This tells the agent what to doāclearly, concisely.

Giving Instructions to the custom agent
š„ Step 6: Add Tools to Make It Happen
Now we tell the agent how to complete the task:
Click āInsert Toolā and search for Slack.
Choose āRetrieve Thread Messagesā ā this lets the agent pull the full thread details.
Click āInsert Toolā again and select Gmail.
Choose āSend Emailā as the action.
For the thread timestamp, you can either manually set it or let the agent generate the value automatically.
Enter the desired recipient email address.

Insert the required tools and information
š§Ŗ Step 7: Save and Test
Click Save ā then Test Behavior
Now, react to any Slack thread, and youāll get a summary in your inbox. Clean, fast, and actually useful.
š Thatās it!
This isnāt just a one-off automation.
You now have a working AI agent that saves your brainpower for things that actually matter.
And if this setup clicked for youāyou can use the same logic to:
ā Auto-send weekly team updates
ā Summarize meeting transcripts
ā Sort your calendar highlights
ā Or build your own custom workflows
All without touching a line of code.. š§āš»
š„ Prefer to watch instead?
Check out the full video tutorial here ā Build your own AI Agent
š Bonus Drop: Build-Worthy AI Agent Ideas

We got a comment asking for more use cases beyond Slack.
Fair ask. We heard you. And weāre delivering.
Here are some practical, creative AI agents you can build across platforms you already use:
š§ The Mood Reader (for internal emails, LinkedIn DMs, or even team chat)
Analyzes your inbox or messages daily and alerts you when someoneās tone shifts ā frustration, hesitation, burnout vibes. A quiet way to stay emotionally in sync with your team, clients, or network.
š” The Idea Refiner (perfect for LinkedIn post drafts, meeting notes, or saved voice memos)
Collects rough ideas you jot down (in Notes, Google Docs, Notion, etc.), improves and expands them using GPT, and sends you 3 polished versions every Friday ā ready for publishing or pitching.
šø The IG Recap Agent (for creators or marketers)
Pulls your best-performing Instagram posts from the week, summarizes comments + DMs, and suggests what to post next ā based on engagement trends and topic overlap.
šµļø The Meeting Ghost (yes, this oneās a keeper)
Reads your video meeting transcripts and pulls out the actual action items, key decisions, and follow-ups. Sends you a tight recap before youāve even left the Zoom window.
š¬ The LinkedIn Lead Nurturer
Watches for new comments or DMs on your posts, checks for potential leads or collab requests, and drafts a personalized response you can review and send ā instantly keeping your network warm.
š Note: No matter the platform, the agent framework remains the same:
trigger ā behavior ā tools ā action.
Built something cool? Or want to remix these ideas into your own?
Tell us what youāve made (or are planning to build)
Weād love to feature the most creative AI agents and share them with our community. Inspiration leads to innovationāand yours might just spark someone elseās next big build.
š ICYMI
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Until next time,
Team DigitalSamaritan
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