# Kit AI integration on Definable

> Kit is a platform that allows creators to automate tasks and developers to build apps for the Kit App Store.

## What this connects

Kit is a platform that allows creators to automate tasks and developers to build apps for the Kit App Store.

Vendor: https://kit.com/

## Tools available

**42** tools available. First 12:

- `KIT_ADD_SUBSCRIBER_TO_FORM` — Add Subscriber to Form — Add an existing subscriber to a form by their IDs. This action associates a subscriber with a form in Kit. The subscriber must already exist in your Kit account (use KIT_LIST_SUBSCRIBERS to find them). The form must also exist (use KIT_LIST_FORMS to find valid form IDs). Returns HTTP 201 if the subscriber is newly added to the form, or HTTP 200 if they were already associated with the form. Both cases are considered successful operations. Important: This action requires both form_id and subscriber_id (aliased as 'id' in requests). An optional referrer URL can be provided for tracking purposes and will have its UTM parameters automatically parsed.
- `KIT_ADD_SUBSCRIBER_TO_FORM_BY_EMAIL` — Add Subscriber to Form by Email — Tool to add an existing subscriber to a form using their email address. Use when you know the subscriber's email but not their ID. The subscriber must already exist in your Kit account before adding them to a form. Returns HTTP 201 if the subscriber is newly added to the form, or HTTP 200 if they were already associated with the form.
- `KIT_CREATE_BROADCAST` — Create Broadcast — Tool to create a new broadcast (email campaign) to send to subscribers. Use when you need to draft, schedule, or immediately publish an email broadcast. To save as draft, set send_at to null; to schedule, provide a future send_at timestamp; to publish to web, set public to true.
- `KIT_CREATE_CUSTOM_FIELD` — Create Custom Field — Tool to create a new custom field for subscriber data. Use when you need to store extra attributes for subscribers.
- `KIT_CREATE_SUBSCRIBER` — Create Subscriber — Tool to create a new subscriber or update an existing one (upsert). If a subscriber with the provided email address does not exist, creates one. If already exists, updates the first name.
- `KIT_CREATE_TAG` — Create Tag — Tool to create a new tag in the account. Use when you need a custom label to segment subscribers. Use after confirming tag uniqueness to avoid duplicates. Example: "Create a tag called 'VIP' for premium customers."
- `KIT_CREATE_WEBHOOK` — Create Webhook — Creates a webhook subscription for real-time event notifications. Use this to receive HTTP POST notifications when subscriber events (activate, unsubscribe, form subscribe, tag add/remove, link clicks, etc.) or purchase events occur in your Kit account.
- `KIT_DELETE_BROADCAST` — Delete Broadcast — Tool to delete a specific broadcast. Use when you need to permanently remove a broadcast by ID (after confirming the ID). Example prompt: "Delete broadcast with ID 123"
- `KIT_DELETE_CUSTOM_FIELD` — Delete Custom Field — Tool to delete a specific custom field. Use after confirming the custom field ID is correct. Deletes the field permanently.
- `KIT_DELETE_SUBSCRIBER` — Delete Subscriber — Unsubscribe a subscriber from all email communications by their ID. This action permanently unsubscribes a subscriber, removing them from all sequences and forms. The subscriber's historical data is retained but they will no longer receive emails. This operation is idempotent - unsubscribing an already-unsubscribed subscriber succeeds without error. Use KIT_LIST_SUBSCRIBERS to find valid subscriber IDs before calling this action. Returns: Empty response on success (HTTP 204 No Content). Raises: ExecutionFailed: If the subscriber ID doesn't exist (404), authentication fails (401), or other API errors occur.
- `KIT_DELETE_TAG` — Delete Tag — Tool to delete a tag by ID. Use when you need to remove obsolete or incorrect tags after confirming the tag exists.
- `KIT_DELETE_WEBHOOK` — Delete Webhook — Tool to delete a webhook by ID. Use when you want to permanently remove a webhook after confirming its ID.

## Auth

Auth schemes: `OAUTH2`, `API_KEY`. Managed by Definable: `OAUTH2` — no client credentials required from the user.

## How agents use Kit

Inside a Definable workflow, Kit is one of the tools the **Distributor specialist** can call. Example coordination patterns:

- **Researcher → Kit** — the Researcher (GPT-5.5) pulls context from Kit (records, threads, documents), synthesises findings, and briefs the rest of the team.
- **Writer → Distributor → Kit** — the Writer (Claude Opus 4.7) drafts copy in brand voice, the Verifier passes it, then the Distributor writes the result into Kit (create record, post message, draft email).
- **Designer / Engineer → Distributor → Kit** — the Designer ships an asset or the Engineer ships a code change, the Distributor delivers it via Kit (attach file, open PR comment, post status).

The Verifier checks every Kit call. On rate limit, schema drift, or auth refresh it self-heals and retries — the workflow completes without manual intervention.

## Categories

- marketing automation — https://definable.ai/apps/category/marketing-automation/
- email newsletters — https://definable.ai/apps/category/email-newsletters/

## Related

- HTML page: https://definable.ai/apps/kit/
- Same category (marketing automation): https://definable.ai/apps/category/marketing-automation/
- All integrations: https://definable.ai/apps/
- Workflow (multi-agent loop): https://definable.ai/workflow/
- Apps llms.txt index: https://definable.ai/llms-apps.txt