Kit is a platform that allows creators to automate tasks and developers to build apps for the Kit App Store.
Kit is a platform that allows creators to automate tasks and developers to build apps for the Kit App Store. On Nagent, Kit is exposed as a fully-configurable marketing automation integration that any agent can call — 42 actions, and OAUTH2, API_KEY authentication. No code is required to wire Kit into your workflow — connect it once via the External Integrations panel and reuse it across every agent you build.
Agent builders use Kit to automate the kinds of tasks marketing automation teams previously handled manually. Concrete examples — each one is a single agent step in Nagent — include:
Every action and trigger is paired with a structured input/output schema (visible in the sections below), so when you wire Kit into Helix — our agentic agent builder — the editor knows exactly what each step expects and produces. Configure once, deploy anywhere across your Nagent agents.
Every operation an agent can call against Kit, with input parameters and output schema. Drop these into any step of an agent built in Helix.
KIT_ADD_SUBSCRIBER_TO_FORMAdd 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.
Input parameters
The ID of the subscriber to add to the form. Use KIT_LIST_SUBSCRIBERS to get valid subscriber IDs. The subscriber must already exist in your Kit account.
The ID of the form to which the subscriber will be added. Use KIT_LIST_FORMS to get valid form IDs.
Optional referrer URL for tracking purposes. Can include UTM parameters (e.g., utm_source, utm_medium, utm_campaign) which will be parsed and included in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_ADD_SUBSCRIBER_TO_FORM_BY_EMAILTool 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.
Input parameters
The ID of the form to which the subscriber will be added. Use KIT_LIST_FORMS to get valid form IDs.
Optional referrer URL for tracking purposes. Can include UTM parameters (e.g., utm_source, utm_medium, utm_campaign) which will be parsed and included in the response.
The email address of the subscriber to add to the form. The subscriber must already exist in your Kit account.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_CREATE_BROADCASTTool 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.
Input parameters
Whether to publish the broadcast to your public creator profile. Set to true to make it visible on your website.
Email content/body (HTML or plain text)
Scheduled send time in ISO 8601 format. Set to null to save as draft without scheduling. Must be a future timestamp.
Email subject line for the broadcast
Internal description for the broadcast (not visible to subscribers)
Sending email address to use for the broadcast. Uses the account's default sending email address if not provided. Must be a confirmed email address associated with your account.
ID of the email template to use for styling. If not provided, the default template will be used.
Array of filter groups to target specific subscribers. Each group contains conditions combined with 'all' logic. If not provided, sends to all subscribers.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_CREATE_CUSTOM_FIELDTool to create a new custom field for subscriber data. Use when you need to store extra attributes for subscribers.
Input parameters
The display label for the custom field (e.g., 'Favorite Color').
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_CREATE_SUBSCRIBERTool 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.
Input parameters
Valid states for a subscriber.
Custom fields as key-value pairs. Custom fields that don't exist will be ignored by the API.
The subscriber's first name. If the subscriber already exists, this will update their first name.
The subscriber's email address (required). If a subscriber with this email already exists, their first name will be updated.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_CREATE_TAGTool 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."
Input parameters
Name of the tag to be created.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_CREATE_WEBHOOKCreates 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.
Input parameters
Event type and optional filters for the webhook subscription.
HTTPS URL endpoint that will receive webhook POST notifications when the event triggers.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_DELETE_BROADCASTTool 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"
Input parameters
Unique identifier of the broadcast to delete
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_DELETE_CUSTOM_FIELDTool to delete a specific custom field. Use after confirming the custom field ID is correct. Deletes the field permanently.
Input parameters
Unique identifier of the custom field to delete
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_DELETE_SUBSCRIBERUnsubscribe 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.
Input parameters
The unique subscriber ID to unsubscribe. Must be a positive integer. Use KIT_LIST_SUBSCRIBERS to find valid subscriber IDs.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_DELETE_TAGTool to delete a tag by ID. Use when you need to remove obsolete or incorrect tags after confirming the tag exists.
Input parameters
Unique identifier of the tag to delete
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_DELETE_WEBHOOKTool to delete a webhook by ID. Use when you want to permanently remove a webhook after confirming its ID.
Input parameters
Unique identifier of the webhook to delete
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_FILTER_SUBSCRIBERSTool to filter subscribers based on engagement criteria such as email opens, clicks, or delivery status. Use when you need to segment subscribers by their engagement behavior with specific date ranges and count thresholds.
Input parameters
Array of filter conditions where ALL must be met (AND logic). At least one condition is required. Each condition filters subscribers based on engagement type (opens, clicks, sent, delivered, subscribed) with optional count and date constraints.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_ACCOUNTTool to retrieve current account information. Use after validating API key to fetch account ID, plan type, primary email, and timezone details.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_ACCOUNT_COLORSTool to retrieve list of colors associated with the account. Use after confirming authentication to fetch account-specific color palette.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_BROADCASTTool to retrieve details of a specific broadcast by ID. Use when you have a valid broadcast ID and need its metadata.
Input parameters
Unique identifier of the broadcast to retrieve
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_BROADCAST_CLICKSTool to retrieve link click data for a specific broadcast by ID. Use when you need to analyze which links were clicked and their engagement metrics.
Input parameters
Pagination cursor to retrieve results after this cursor
Pagination cursor to retrieve results before this cursor
Number of results per page; must be between 1 and 500
Unique identifier of the broadcast to fetch click data for
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_BROADCAST_STATSTool to retrieve statistics for a specific broadcast by ID. Use after a broadcast has been sent to monitor performance.
Input parameters
Unique identifier of the broadcast to fetch statistics for
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_CREATOR_PROFILETool to retrieve the creator profile information for the account. Use when you need creator metadata (name, bio, avatar, profile URL) before publishing or customizing content.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_EMAIL_STATSTool to retrieve email statistics for the account. Use after confirming authentication to fetch metrics on emails (sent, opened, clicked) over the last 90 days.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_GROWTH_STATSTool to retrieve growth statistics for the account over a date range. Stats are returned in your sending time zone (not UTC). Defaults to last 90 days if no dates specified.
Input parameters
Get stats for time period ending on this date (format yyyy-mm-dd). Defaults to today.
Get stats for time period beginning on this date (format yyyy-mm-dd). Defaults to 90 days ago.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_SUBSCRIBERTool to retrieve a specific subscriber by their ID. Use when you need to fetch detailed information about a single subscriber.
Input parameters
The unique subscriber ID to retrieve. Must be a positive integer.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_GET_SUBSCRIBER_STATSTool to retrieve email stats for a specific subscriber. Use when you need subscriber engagement metrics (opens, clicks, bounces, rates). Data only available for events from June 2025 onwards.
Input parameters
The ID of the subscriber to get stats for
Filter to stats for emails sent after this date (YYYY-MM-DD format). Must be on or after 2025-06-24.
Filter to stats for emails sent before this date (YYYY-MM-DD format)
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_BROADCASTSTool to retrieve a paginated list of all broadcasts. Use when you need to enumerate or review broadcast summaries with cursor-based pagination.
Input parameters
Cursor for pagination; returns results after the specified cursor.
Cursor for pagination; returns results before the specified cursor.
Number of results per page; must be between 1 and 500.
If set to 'true', includes the total count of records in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_CUSTOM_FIELDSTool to retrieve a paginated list of custom fields. Use after confirming you need to enumerate or inspect all custom fields with cursor-based pagination.
Input parameters
Cursor for pagination; returns results after the specified cursor.
Cursor for pagination; returns results before the specified cursor.
Number of results per page; defaults to 500 if not specified.
If set to 'true', includes the total count of records in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_EMAIL_TEMPLATESRetrieve a paginated list of all email templates in the Kit account. Returns template details including ID, name, default status, and category. Supports cursor-based pagination for navigating large template collections. Use this when you need to view or iterate through email templates.
Input parameters
Cursor for fetching the next page of results. Use the 'end_cursor' value from a previous response.
Cursor for fetching the previous page of results. Use the 'start_cursor' value from a previous response.
Number of email templates to return per page. Default is 500, maximum is 1000.
Include the total count of email templates in the response. Note: This may slow down the response for large collections.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_FORMSLists all forms in your Kit account with optional filtering and cursor-based pagination. Use this to retrieve forms when you need to: - Get all available forms (landing pages and embedded forms) - Filter by status (active, archived, trashed) or type (embed, hosted) - Paginate through large collections of forms - Get form IDs and metadata for other operations
Input parameters
Filter forms by type.
Cursor for pagination; returns results after the specified cursor.
Cursor for pagination; returns results before the specified cursor.
Filter forms by status: 'active' (default), 'archived', 'trashed', or 'all'.
Number of forms to return per page (default: 500, max: 1000).
If set to true, includes the total count of forms in the response (may be slower for large collections).
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_SEGMENTSTool to retrieve a paginated list of segments. Use when you need to enumerate segments with cursor-based pagination for further processing or display.
Input parameters
Cursor for pagination; returns results after this cursor.
Cursor for pagination; returns results before this cursor.
Number of segments to return per page (min 1).
If set to 'true', includes the total count of segments in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_SEQUENCESTool to retrieve a paginated list of all sequences. Use when you need to enumerate sequences with pagination for further processing or display.
Input parameters
Cursor for pagination; returns results after the specified cursor.
Cursor for pagination; returns results before the specified cursor.
Number of results per page (max 1000, default 500).
If set to 'true', includes the total count in the pagination.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_SUBSCRIBERSTool to retrieve a list of subscribers. Use when you need to fetch subscriber records with optional filtering, sorting, and pagination.
Input parameters
Cursor for pagination; returns subscribers after this cursor.
Cursor for pagination; returns subscribers before this cursor.
Filter by subscriber status (e.g., 'active' or 'inactive').
Number of subscribers to return per page (min 1).
Field by which to sort the subscribers. Must be one of: 'id', 'cancelled_at', or 'updated_at'. Note: If 'cancelled_at' is used, the status parameter must be set to 'cancelled'.
Order in which to sort the results.
Filter to subscribers created after this date (YYYY-MM-DD).
Exact email address to filter by.
Filter to subscribers updated after this date (YYYY-MM-DD).
Filter to subscribers created before this date (YYYY-MM-DD).
Filter to subscribers updated before this date (YYYY-MM-DD).
If set to 'true', includes the total count of subscribers in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_SUBSCRIBERS_FOR_FORMRetrieves subscribers for a specific form by ID with optional filtering and cursor-based pagination. Use this action to: - Get all subscribers who have joined a specific form - Filter subscribers by when they were added to the form (added_after/added_before) - Filter subscribers by when they were created (created_after/created_before) - Filter by subscriber status (e.g., 'active') - Navigate through results using cursor-based pagination (after/before cursors) - Control page size with per_page parameter - Optionally get total subscriber count with include_total_count='true' First use KIT_LIST_FORMS to get valid form_id values.
Input parameters
Cursor for pagination; returns results after this cursor.
Cursor for pagination; returns results before this cursor.
Filter subscribers by status (e.g., 'active').
ID of the form whose subscribers you want to retrieve.
Number of results to return per page (min 1).
Return subscribers added to the form after this date/time (ISO 8601).
Return subscribers added to the form before this date/time (ISO 8601).
Return subscribers created after this date/time (ISO 8601).
Return subscribers created before this date/time (ISO 8601).
If 'true', includes the total count of subscribers in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_TAGSRetrieve a paginated list of all tags in the Kit account. Returns tag details including ID, name, and creation date. Supports cursor-based pagination for navigating large tag collections. Use this when you need to view or iterate through tags.
Input parameters
Cursor for fetching the next page of results. Use the 'end_cursor' value from a previous response.
Cursor for fetching the previous page of results. Use the 'start_cursor' value from a previous response.
Number of tags to return per page. Default is 500, maximum is 1000.
Include the total count of tags in the response. Note: This may slow down the response for large collections.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_TAG_SUBSCRIBERSTool to retrieve subscribers for a specific tag. Use after confirming the tag ID when you need to list subscribers associated with a tag.
Input parameters
Cursor for pagination; returns subscribers after this cursor.
Cursor for pagination; returns subscribers before this cursor.
Filter by subscriber status ('active' or 'inactive').
Unique identifier of the tag to retrieve subscribers for
Number of subscribers to return per page (min 1).
Filter to subscribers tagged after this timestamp (ISO 8601).
Filter to subscribers created after this timestamp (ISO 8601).
Filter to subscribers tagged before this timestamp (ISO 8601).
Filter to subscribers created before this timestamp (ISO 8601).
If set to 'true', includes total count of subscribers in the response.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_LIST_WEBHOOKSRetrieve a paginated list of all webhooks configured in the Kit account. Returns webhook details including ID, event type, and target URL. Supports cursor-based pagination for navigating large webhook collections. Use this when you need to view or iterate through webhooks.
Input parameters
Cursor for fetching the next page of results. Use the 'end_cursor' value from a previous response.
Cursor for fetching the previous page of results. Use the 'start_cursor' value from a previous response.
Number of webhooks to return per page. Default is 500, maximum is 1000.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_REMOVE_TAG_FROM_SUBSCRIBERTool to remove a tag from a subscriber using their subscriber ID. Use when you need to untag a subscriber from a specific tag after confirming both tag and subscriber IDs exist.
Input parameters
The unique ID of the tag to remove from the subscriber
The unique ID of the subscriber to remove the tag from
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_TAG_SUBSCRIBERTool to associate a subscriber with a specific tag by ID. Use after confirming tag and subscriber IDs when tagging a subscriber.
Input parameters
ID of the tag to assign
ID of the subscriber to tag
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_TAG_SUBSCRIBER_BY_EMAILAssigns a tag to an existing subscriber using their email address. The subscriber must already exist in your Kit account. Returns the subscriber's details including the timestamp when they were tagged. Use when you have a valid tag ID and the subscriber's email address.
Input parameters
The ID of the tag to assign to the subscriber
The subscriber's email address. The subscriber must already exist in your Kit account.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_UNTAG_SUBSCRIBER_BY_EMAILTool to remove a tag from a subscriber using their email address. Use when you need to untag an existing subscriber after confirming both the tag ID and subscriber's email address are valid.
Input parameters
The ID of the tag to remove from the subscriber
The email address of the subscriber to untag. The subscriber must already exist in your Kit account.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_UPDATE_ACCOUNT_COLORSTool to update the list of colors for the account. Use when customizing your Kit account's color palette for broadcasts and templates. Maximum 5 hex color codes allowed per account.
Input parameters
List of hex color codes to set for the account (e.g., '#008000', '#FF0000'). Maximum 5 colors allowed.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_UPDATE_CUSTOM_FIELDTool to update a custom field's label. Use after listing or retrieving custom fields and confirming the field ID to rename.
Input parameters
Unique identifier of the custom field to update
New label for the custom field
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_UPDATE_SUBSCRIBERTool to update an existing subscriber's information. Use when you need to modify a subscriber's first name, email address, or custom fields. Supports updating up to 140 custom fields at a time.
Input parameters
The unique subscriber ID to update. Must be a positive integer. Use KIT_LIST_SUBSCRIBERS to find valid subscriber IDs.
Custom fields as key-value pairs. Maximum 140 custom fields can be updated at a time. The API will ignore custom fields that don't exist in your account.
The subscriber's first name to update.
The subscriber's email address to update.
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
KIT_UPDATE_TAGTool to update a tag's name by ID. Use after retrieving tag ID and confirming the new name.
Input parameters
Unique identifier of the tag to update
New name for the tag
Output
Data from the action execution
Error if any occurred during the execution of the action
Whether or not the action execution was successful or not
No publicly available marketplace agent is found using this tool yet. There are 38 agents privately built on Nagent that already use Kit.
Build on Nagent
Connect Kit to any Nagent agent in minutes — no API key management, no boilerplate. Just configure and deploy.
The five questions agent builders ask before adopting a new integration.
Open the External Integrations panel inside Nagent (app.nagent.ai/externalIntegration), find Kit, and click "Connect Now." You'll authenticate with OAUTH2, API_KEY — Nagent handles credential storage and refresh automatically. Once connected, Kit is available to any agent in your workspace.
No. Nagent provides no-code integration for every tool. Once Kit is connected, you configure its 42 actions directly in the agent builder UI — no API calls, no boilerplate, no schema management.
Helix — Nagent's agentic agent builder — lets you drop Kit steps into any workflow visually. Pick an action (e.g., one of those listed above), fill in the inputs (Helix knows the required vs. optional schema for each parameter), and connect it to upstream/downstream steps. Triggers run as the entry point of an agent, so when a Kit event fires, the agent kicks off automatically.
Every Kit action and trigger ships with a fully-typed schema — input parameters with name, type, required flag, and description, plus the output payload shape. The schemas are documented in the sections above. Helix uses these schemas to validate your configuration at build time and to type-check the data flowing between steps.
Yes. While Kit ships with 42 pre-built marketing automation actions, you can layer custom logic around them inside Helix — pre/post-processing steps, conditional branches, retries, or stitching Kit together with other connected tools. For deeper customization, talk to our team about Nagent's Agentic AI Lab — forward-deployed engineers who build Kit-based workflows tailored to your business.