Integration

Connect Harpoon to Slack

When something happens in Harpoon, your agent does the next thing in Slack. Describe it in plain language and the automation is built, tested on every branch and kept running.

Harpoon9 triggersHarpoon45 actionsSlack17 triggersSlack60 actions

Browse all apps

Build it

What do you want Harpoon and Slack to do together?

Describe it and your agent reads both APIs, builds the automation, tests every branch and ships it. The list below is what exists today, not the limit.

Ask the assistant

You'll sign in before anything runs. What you typed comes with you.

Or work from Claude Code

Install the APIANT plugin for Claude Code and build, edit, test and read run history from your terminal. Every plan gets this, including free, and it spends no assistant credits.

Connect Claude Code

Everything your agent can do with Harpoon and Slack

Triggers and actions 26 triggers · 105 actions

Trigger
New Client
Triggered when a new client is created in Harpoon.
Trigger
New Contact
Triggered when a new contact is created in Harpoon.
Trigger
New Expense
Triggered when a new expense is created in your Harpoon account.
Trigger
New Expense Category
Triggered when a new expense category is created in Harpoon.
Trigger
New Invoice
Triggered when a new invoice is created in Harpoon.
Trigger
New Payment
Triggered when a new payment is recorded in your Harpoon account.
Trigger
New Project
Triggered when a new project is created in Harpoon.
Trigger
New Task Category
Triggered when a new task category is added in your Harpoon account.
Trigger
New Time Entry
Triggered when a new time entry is logged in Harpoon.
Action
Add Credit Entry
Creates a new credit entry on a client's account in Harpoon, recording an amount, a date and an optional note or originating invoice. Returns the credit entry that was created.
Action
Add Invoice
Creates a new invoice in Harpoon for a client or project, with an invoice number, issue date, and optional line items. Returns the invoice that was created.
Action
Add Lead Source
Creates a new lead source in Harpoon, so new clients can be tagged with where they came from. Returns the lead source that was created.
Action
Add Note
Adds a note to a client, project or invoice in Harpoon. Returns the note that was created.
Action
Add Team
Creates a new team in your Harpoon account. Harpoon populates the new team from your account details; the API accepts no team attributes on creation.
Action
Clone Time Entry
Creates a copy of an existing time entry in Harpoon. The copy keeps the original's project, task and description, and starts with today's date and zero hours logged.
Action
Create Contact
Creates a contact person under a Harpoon client, with their name, email address, and phone number. Returns the contact that was created.
Action
Create Expense
Records a one-off expense in Harpoon with its date, amount, and vendor, optionally attributed to a client, project, or expense category. Returns the expense that was created.
Action
Create Expense Category
Creates a new expense category in your Harpoon account so expenses can be grouped under it.
Action
Create Project
Creates a project in Harpoon for a client, with its budget, rate, and start and end dates. Returns the project that was created.
Action
Create Time Entry
Logs hours worked in Harpoon for a team member on a given date, optionally against a client or project. Returns the time entry that was created.
Action
Delete Client
Deletes a client from your Harpoon account.
Action
Delete Expense
Permanently deletes an expense from your Harpoon account.
Action
Delete Invoice
Permanently removes an invoice from Harpoon. Returns Harpoon's confirmation that the invoice was deleted.
Action
Delete Note
Deletes a note from your Harpoon account.
Action
Delete Recurring Expense
Deletes a recurring expense template from Harpoon by its id, so it stops generating new expenses.
Action
Delete Recurring Invoice
Stops and removes a recurring invoice schedule in Harpoon so it no longer generates invoices. Returns Harpoon's confirmation that it was deleted.
Action
Delete Time Entry
Deletes a time entry from your Harpoon account.
Action
Get Client
Returns a single client from your Harpoon account, including its name, contact details and other stored attributes.
Action
Get Client Credits
Returns a client's credit entries in Harpoon, along with the credit still available on the account.
Action
Get Contact
Returns a single Harpoon contact, including their name, email address, phone number, and the client they belong to.
Action
Get Estimate
Returns a single estimate from your Harpoon account, including its client, line items, totals and status.
Action
Get Expense
Returns a single expense from your Harpoon account, including its amount, date, vendor, category and the client or project it is attached to.
Action
Get Expense Category
Returns a single Harpoon expense category with every detail it carries, including its name and budget settings.
Action
Get Invoice
Fetches one invoice from Harpoon by its id, with its client, line items and payment totals. An error occurs if the invoice is not found.
Action
Get Lead Source
Returns a single lead source from your Harpoon account.
Action
Get Project
Returns a single project from your Harpoon account, including its client, budget and status.
Action
Get Recurring Expense
Fetches one recurring expense template from Harpoon by its id, with its vendor, amount, frequency and schedule. An error occurs if it is not found.
Action
Get Recurring Invoice
Returns a single recurring invoice schedule from Harpoon, including its client, frequency, dates, and line items.
Action
Get Task
Returns a single task category from your Harpoon account, including its name and hourly rate.
Action
Get Team
Returns a single team from your Harpoon account, including its name, email address, phone, address, owner and whether it is active.
Action
Get Time Entry
Returns a single tracked time entry from your Harpoon account, including its date, hours, client, project and notes.
Action
List Contacts
Returns the contacts in your Harpoon account, including each contact's name, email address and phone number.
Action
List Estimates
Returns the estimates in a Harpoon account, optionally narrowed to a year, client, project, status, or search text.
Action
List Expense Categories
Returns the expense categories set up in Harpoon, each with its budget settings.
Action
List Expenses
Returns the expenses in your Harpoon account, optionally narrowed by date range, client, project, category, billing status or search text.
Action
List Projects
Returns the projects in a Harpoon account, with their client, budget, rate, and dates.
Action
List Teams
Returns the teams in your Harpoon account, along with the total number of teams found.
Action
List Time Entries
Returns time entries from your Harpoon account — either the timers running now or logged history for a date range — optionally narrowed by client, project, task, team member or billing status.
Action
Update Expense
Updates an existing expense in your Harpoon account. Only the values you supply are changed.
Action
Update Invoice
Updates an existing invoice in your Harpoon account. Only the values you supply are changed.
Action
Update Project
Updates an existing project in Harpoon — its name, client, billing type, status, dates, budget and task rates. Returns the updated project.
Action
Update Recurring Expense
Updates a recurring expense in Harpoon — its vendor, amount, frequency, category, dates, and status. Anything left blank keeps its current value. Returns the updated recurring expense.
Action
Update Recurring Invoice
Updates an existing recurring invoice template in your Harpoon account. Only the values you supply are changed.
Action
Update Time Entry
Updates an existing time entry in Harpoon — its date, hours, description, project, task or billing state.
Trigger
New Channel
Triggers when a new channel is created in the workspace.
Trigger
New Channel (instant)
Triggers when a new channel is created. Events API event: channel_created.
Trigger
New Channel Member
Triggers when a member joins a chosen channel. Events API event: member_joined_channel.
Trigger
New File
Duplicate of "New File (instant)" (webhook_demux, same file_created event). Hidden from catalog 2026-07-23.
Trigger
New File (instant)
Triggers when a new file is uploaded to the workspace. Events API event: file_created.
Trigger
New Mention
Duplicate of "New Mention (instant)" (webhook_demux, same app_mention event). Hidden from catalog 2026-07-23.
Trigger
New Mention (instant)
Triggers when a username or keyword is mentioned in a channel. Events API message events with keyword filter.
Trigger
New Message Posted to Channel
Triggers when a message is posted to a chosen channel. Events API event: message.channels.
Trigger
New Message Posted to Private Channel
Triggers when a message is posted to a chosen private channel or group DM. Events API events: message.groups, message.mpim.
Trigger
New Pinned Item
Triggers when an item is pinned in a channel.
Trigger
New Public Message Posted Anywhere
Triggers when a message is posted to any public channel. Events API event: message.channels.
Trigger
New Reaction Added
Triggers when an emoji reaction is added to a message. Events API event: reaction_added.
Trigger
New Saved Message
Triggers when a message or file is saved (starred). Events API event: star_added.
Trigger
New Team Custom Emoji
Triggers when a custom emoji is added to the workspace. Events API event: emoji_changed.
Trigger
New Thread Reply
Triggers when a new reply is added to a message thread.
Trigger
New User
Triggers when a new user joins the workspace. Polling; deduped by user id.
Trigger
New User (instant)
Triggers when a new user joins the workspace. Events API event: team_join.
Action
Add Bookmark
Add a bookmark to a channel.
Action
Add Reaction
Add an emoji reaction to a message.
Action
Add Star
Save a message or file by starring it.
Action
Archive Channel
Archive a channel.
Action
Complete Reminder
Mark a reminder as complete.
Action
Create Canvas
Create a standalone canvas document.
Action
Create Channel
Create a new public or private channel.
Action
Create Channel Canvas
Create a canvas attached to a channel.
Action
Create Reminder
Create a reminder for a user at a specified time.
Action
Delete Canvas
Delete a canvas.
Action
Delete File
Delete a file from the workspace.
Action
Delete Message
Delete a message from a channel by timestamp.
Action
Delete Reminder
Delete a reminder.
Action
Delete Scheduled Message
Cancel a scheduled message before it is sent.
Action
Edit Bookmark
Edit an existing channel bookmark.
Action
Edit Canvas
Edit the content of a canvas.
Action
Find Channel by Name
List channels filtered to locate a channel by name (client filters the returned list).
Action
Find User by Email
Look up a Slack user by their email address.
Action
Get Channel Messages
Fetch the message history of a channel.
Action
Get File Info
Get information about a file.
Action
Get Message Permalink
Get a permanent link to a specific message.
Action
Get Message Reactions
Get the emoji reactions on a message.
Action
Get Team Info
Get information about the workspace.
Action
Get Thread Replies
Get the replies in a message thread.
Action
Get User Info
Get profile information for a Slack user by ID.
Action
Get User Presence
Get a user's current presence status.
Action
Get User Profile
Get a user's profile fields.
Action
Invite User to Channel
Invite one or more users to a channel (comma-separated user IDs).
Action
Join Channel
Join a public channel.
Action
Leave Channel
Leave a channel.
Action
List Bookmarks
List the bookmarks in a channel.
Action
List Channel Members
List the members of a channel.
Action
List Channels
List channels in the workspace (public and private).
Action
List Custom Emojis
List the workspace's custom emojis.
Action
List Files
List files in the workspace, optionally filtered by channel or user.
Action
List Pinned Items
List the items pinned in a channel.
Action
List Scheduled Messages
List messages scheduled to be sent later.
Action
List User Groups
List the workspace's user groups.
Action
List Users
List all users in the workspace.
Action
List User's Channels
List the channels a user is a member of.
Action
Mark Channel Read
Set the read cursor position in a channel.
Action
Pin Message
Pin a message to a channel.
Action
Remove Bookmark
Remove a bookmark from a channel.
Action
Remove Reaction
Remove an emoji reaction from a message.
Action
Remove Star
Remove a star from a message or file.
Action
Remove User from Channel
Remove a member from a channel.
Action
Rename Channel
Rename a channel.
Action
Schedule Message
Schedule a message to be sent to a channel at a future Unix time.
Action
Search Files
Search files across the workspace.
Action
Search Messages
Search messages across the workspace.
Action
Send Direct Message
Open a DM with a user and post a message to it.
Action
Send Ephemeral Message
Send a message in a channel that is visible only to one user.
Action
Send Message
Post a message to a channel, private group, or DM.
Action
Set Channel Purpose
Set the purpose (description) for a channel.
Action
Set Channel Topic
Set the topic for a channel.
Action
Set User Presence
Set the authenticated user's presence status.
Action
Unarchive Channel
Restore an archived channel.
Action
Unpin Message
Remove a pinned message from a channel.
Action
Update Message
Update an existing message in a channel by timestamp.
Action
Upload File
Upload a file and share it to one or more channels.

Each app on its own

The other way round: Slack to Harpoon