Communication

Connect Slack with Topcalls AI voice agents

26 actions · 14 triggers · Last verified July 1, 2026

The short answer

Slack is a channel-based messaging platform where sales, support, and ops teams live during the workday. Connected to Topcalls, an AI voice agent can post call summaries and hot-lead alerts into the right Slack channel, look up the on-call rep by email, and pull channel history for context before dialing back.

What you can automate with Slack

Alert the sales channel when a call converts

The moment a Topcalls voice agent closes a booked meeting, a Slack message posts to the sales channel with the caller's name, company, and next step. The AI voice agent picks the right channel by name, drops a link to the recording, and adds a green check reaction so reps see the win instantly.

Find the on-call rep by email and DM them the callback

Topcalls uses Find User by Email to resolve the assigned rep's Slack ID, then sends a direct message with the caller's number, transcript summary, and requested callback window. Reps see the ping in Slack and open the recording without leaving the app they already have open.

Spin up a channel for a new enterprise account

When Topcalls qualifies a large deal on the phone, it invokes Create Channel to open a dedicated Slack channel for the account. The AI voice agent posts the call summary as the first message and adds the assigned rep found through Find User by ID, so the deal has its home the moment the call ends.

React to a Slack command with an outbound call

The New Command in Channel and New Command in Direct Message triggers listen for phrases like `@topcalls dial +14155551234`. Topcalls receives the command, places the call at $0.35 per minute, and posts the transcript back into the same Slack thread once the conversation wraps.

Pull recent channel history before an outbound call

Before dialing a warm lead, Topcalls uses Get channel history to pull the last messages from the relevant deal channel. The AI voice agent reads context in its briefing, so it can open the call referencing what the team already agreed with the buyer over Slack.

Slack actions

What your AI voice agent can do in Slack during and after a call.

Add Reaction to Message

Add an emoji reaction to a message.

Create Channel

Creates a new channel.

Delete Message

Deletes a specific message from a channel using the message's timestamp.

Find User by Email

Finds a user by matching against their email address.

Find User by Handle

Finds a user by matching against their Slack handle.

Find User by ID

Finds a user by their ID.

Get channel history

Retrieve all messages from a specific channel ("conversation") between specified timestamps

Get File

Return information about a given file ID.

Get Message by Timestamp

Retrieves a specific message from a channel history using the message's timestamp.

Invite User to Channel

Invites an existing User to an existing channel.

List users

List all users of the workspace

Markdown to Slack format

Convert Markdown-formatted text to Slack's pseudo - markdown syntax

Request Action from A User

Send a message to a user and wait until the user selects an action

Request Action in A Channel

Send a message in a channel and wait until an action is selected

Request Approval from A User

Send approval message to a user and then wait until the message is approved or disapproved

Request Approval in a Channel

Send approval message to a channel and then wait until the message is approved or disapproved

Retrieve Thread Messages

Retrieves thread messages by channel and thread timestamp.

Search messages

Searches for messages matching a query

Send Message To A User

Send message to a user

Send Message To A Channel

Send message to a channel

Set Channel Topic

Sets the topic on a selected channel.

Set User Status

Sets a user's custom status

Update message

Update an existing message

Update Profile

Update basic profile field such as name or title.

Upload file

Upload file without sharing it to a channel or user

Custom API Call

Call any Slack REST API endpoint directly from your workflow.

Slack triggers

Events in Slack that can start a Topcalls call automatically.

Channel created

Triggers when a channel is created

New Command in Direct Message

Triggers when a specific command is sent to the bot (e.g., @bot command arg1 arg2) via Direct Message.

New Command in Channel

Triggers when a specific command is sent to the bot (e.g., @bot command arg1 arg2)

New Direct Message

Triggers when a message was posted in a direct message channel.

New Mention in Direct Message

Triggers when a username is mentioned in a direct message channel.

New Mention in Channel

Triggers when a user or user group is mentioned.

New Message Posted to Channel

Triggers when a new message is posted to a specific #channel you choose.

New Public Message Posted Anywhere

Triggers when a new message is posted to any channel.

New Modal Interaction

Triggers when a user interacts with a modal.

New Reaction

Triggers when a new reaction is added to a message

Reaction Removed

Triggers when a reaction is removed from a message

New Saved Message

Triggers when you save a message.

New Team Custom Emoji

Triggers when a custom emoji has been added to a team.

New User

Triggers when a new user is created / first joins your org.

Frequently asked questions

Can Topcalls post call summaries to a Slack channel?

Yes. Topcalls posts each call summary, transcript link, and outcome tag into the Slack channel of your choice. The AI voice agent picks the channel by name or ID and can add an emoji reaction to signal outcomes like won, callback, or no-answer.

Can a Slack command trigger a Topcalls voice call?

Yes. The New Command in Channel and New Command in Direct Message triggers accept commands like `@topcalls call +14155551234`. Topcalls parses the payload, launches the call, and posts the recording back into the thread when the conversation ends.

How does Topcalls know which Slack user to notify?

Topcalls resolves Slack users through Find User by Email, Find User by Handle, or Find User by ID. The AI voice agent picks the lookup method based on what the caller mentioned, then direct messages that user with the callback details captured on the phone.

Does Topcalls send Slack file uploads?

Yes. Topcalls attaches call recordings and PDF transcripts to Slack messages using Slack's file endpoints. The Get File action verifies the upload and returns metadata Topcalls can log against the source lead record, so audits stay tidy on both sides.

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