Accounting

Harpoon integrations

Connect Harpoon to any other app, or use it from your AI client over MCP. Harpoon is a financial planning, scheduling, time-tracking, invoicing, and budgeting platform for professional freelancers, studios, and agencies.

Connects with an API keyharpoonapp.com

What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it.

Build solutions, not workarounds.

What do you want to automate with Harpoon?

Ask the assistant

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Connect your AI client

Give your AI client this address.

https://mcp.apiant.ai

Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser.

Set it up in your client
Claude Code

Run this in the directory you want to work in.

claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai

Start Claude Code there, approve the server, and sign in in the browser page it opens.

Claude Code guide (opens in a new tab)
Claude, web and desktop

Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first.

Setup guide (opens in a new tab)
Cursor

Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser.

Setup guide (opens in a new tab)
Zed

Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server.

Setup guide (opens in a new tab)
Codex and the ChatGPT desktop app

Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in.

Setup guide (opens in a new tab)
Any other MCP client

Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection.

Setup guide (opens in a new tab)

Pair it

Connect Harpoon with another app

What your agent can do with Harpoon

Triggers and actions 9 triggers · 46 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 Invoices

    Returns the invoices in your Harpoon account, optionally narrowed by year, client, project, status or a search term.

  • 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.

Related apps

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Questions

Harpoon, answered

Is there a Harpoon MCP server?

APIANT's MCP server at https://mcp.apiant.ai works with Harpoon. Add that address to any AI client that takes a remote MCP server, sign in once in your browser, and your client can build, test and run automations that use Harpoon. Nothing to install.

What can start an automation from Harpoon?

Any of Harpoon's 9 triggers in the catalog, including New Client, New Contact, New Expense and New Expense Category. Describe the moment in plain language and your agent picks the right one.

What can your agent do in Harpoon?

Any of Harpoon's 46 actions, including Create Contact, Create Expense, Create Expense Category and Create Project. Your agent maps the data both ways and tests every scenario before it ships.

Which apps can Harpoon connect to?

Any app in the catalog; the list on this page pairs Harpoon with each of them. If the other app is missing, point your agent at its API documentation and it builds the connector.

What happens when something fails?

Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships.

Is there a free plan?

Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.