Convertkit Automation Skill for Cursor

ConvertKit (Kit) Automation via Rube MCP

Automate ConvertKit (now known as Kit) email marketing operations through Composio's Kit toolkit via Rube MCP.

Toolkit docs: composio.dev/toolkits/kit

Prerequisites

• Rube MCP must be connected (RUBE_SEARCH_TOOLS available)
• Active Kit connection via RUBE_MANAGE_CONNECTIONS with toolkit kit
• Always call RUBE_SEARCH_TOOLS first to get current tool schemas

Setup

Get Rube MCP: Add https://rube.app/mcp as an MCP server in your client configuration. No API keys needed — just add the endpoint and it works.

• Verify Rube MCP is available by confirming RUBE_SEARCH_TOOLS responds
• Call RUBE_MANAGE_CONNECTIONS with toolkit kit
• If connection is not ACTIVE, follow the returned auth link to complete Kit authentication
• Confirm connection status shows ACTIVE before running any workflows

Core Workflows

1. List and Search Subscribers

When to use: User wants to browse, search, or filter email subscribers

Tool sequence:

• KIT_LIST_SUBSCRIBERS - List subscribers with filters and pagination [Required]

Key parameters:

• status: Filter by status ('active' or 'inactive')
• email_address: Exact email to search for
• created_after/created_before: Date range filter (YYYY-MM-DD)
• updated_after/updated_before: Date range filter (YYYY-MM-DD)
• sort_field: Sort by 'id', 'cancelled_at', or 'updated_at'
• sort_order: 'asc' or 'desc'
• per_page: Results per page (min 1)
• after/before: Cursor strings for pagination
• include_total_count: Set to 'true' to get total subscriber count

Pitfalls:

• If sort_field is 'cancelled_at', the status must be set to 'cancelled'
• Date filters use YYYY-MM-DD format (no time component)
• email_address is an exact match; partial email search is not supported
• Pagination uses cursor-based approach with after/before cursor strings
• include_total_count is a string 'true', not a boolean

2. Manage Subscriber Tags

When to use: User wants to tag subscribers for segmentation

Tool sequence:

• KIT_LIST_SUBSCRIBERS - Find subscriber ID by email [Prerequisite]
• KIT_TAG_SUBSCRIBER - Associate a subscriber with a tag [Required]
• KIT_LIST_TAG_SUBSCRIBERS - List subscribers for a specific tag [Optional]

Key parameters for tagging:

• tag_id: Numeric tag ID (required)
• subscriber_id: Numeric subscriber ID (required)

Pitfalls:

• Both tag_id and subscriber_id must be positive integers
• Tag IDs must reference existing tags; tags are created via the Kit web UI
• Tagging an already-tagged subscriber is idempotent (no error)
• Subscriber IDs are returned from LIST_SUBSCRIBERS; use email_address filter to find specific subscribers

3. Unsubscribe a Subscriber

When to use: User wants to unsubscribe a subscriber from all communications

Tool sequence:

• KIT_LIST_SUBSCRIBERS - Find subscriber ID [Prerequisite]
• KIT_DELETE_SUBSCRIBER - Unsubscribe the subscriber [Required]

Key parameters:

• id: Subscriber ID (required, positive integer)

Pitfalls:

• This permanently unsubscribes the subscriber from ALL email communications
• The subscriber's historical data is retained but they will no longer receive emails
• Operation is idempotent; unsubscribing an already-unsubscribed subscriber succeeds without error
• Returns empty response (HTTP 204 No Content) on success
• Subscriber ID must exist; non-existent IDs return 404

4. List and View Broadcasts

When to use: User wants to browse email broadcasts or get details of a specific one

Tool sequence:

• KIT_LIST_BROADCASTS - List all broadcasts with pagination [Required]
• KIT_GET_BROADCAST - Get detailed information for a specific broadcast [Optional]
• KIT_GET_BROADCAST_STATS - Get performance statistics for a broadcast [Optional]

Key parameters for listing:

• per_page: Results per page (1-500)
• after/before: Cursor strings for pagination
• include_total_count: Set to 'true' for total count

Key parameters for details:

• id: Broadcast ID (required, positive integer)

Pitfalls:

• per_page max is 500 for broadcasts
• Broadcast stats are only available for sent broadcasts
• Draft broadcasts will not have stats
• Broadcast IDs are numeric integers

5. Delete a Broadcast

When to use: User wants to permanently remove a broadcast

Tool sequence:

• KIT_LIST_BROADCASTS - Find the broadcast to delete [Prerequisite]
• KIT_GET_BROADCAST - Verify it is the correct broadcast [Optional]
• KIT_DELETE_BROADCAST - Permanently delete the broadcast [Required]

Key parameters:

• id: Broadcast ID (required)

Pitfalls:

• Deletion is permanent and cannot be undone
• Deleting a sent broadcast removes it but does not unsend the emails
• Confirm the broadcast ID before deleting

Common Patterns

Subscriber Lookup by Email

1. Call KIT_LIST_SUBSCRIBERS with email_address='[email protected]'
2. Extract subscriber ID from the response
3. Use ID for tagging, unsubscribing, or other operations

Pagination

Kit uses cursor-based pagination:

• Check response for after cursor value
• Pass cursor as after parameter in next request
• Continue until no more cursor is returned
• Use include_total_count: 'true' to track progress

Tag-Based Segmentation

1. Create tags in Kit web UI
2. Use KIT_TAG_SUBSCRIBER to assign tags to subscribers
3. Use KIT_LIST_TAG_SUBSCRIBERS to view subscribers per tag

Known Pitfalls

ID Formats:

• Subscriber IDs: positive integers (e.g., 3887204736)
• Tag IDs: positive integers
• Broadcast IDs: positive integers
• All IDs are numeric, not strings

Status Values:

• Subscriber statuses: 'active', 'inactive', 'cancelled'
• Some operations are restricted by status (e.g., sorting by cancelled_at requires status='cancelled')

String vs Boolean Parameters:

• include_total_count is a string 'true', not a boolean true
• sort_order is a string enum: 'asc' or 'desc'

Rate Limits:

• Kit API has per-account rate limits
• Implement backoff on 429 responses
• Bulk operations should be paced appropriately

Response Parsing:

• Response data may be nested under data or data.data
• Parse defensively with fallback patterns
• Cursor values are opaque strings; use exactly as returned

Quick Reference

| Task | Tool Slug | Key Params |

|------|-----------|------------|

| List subscribers | KIT_LIST_SUBSCRIBERS | status, email_address, per_page |

| Tag subscriber | KIT_TAG_SUBSCRIBER | tag_id, subscriber_id |

| List tag subscribers | KIT_LIST_TAG_SUBSCRIBERS | tag_id |

| Unsubscribe | KIT_DELETE_SUBSCRIBER | id |

| List broadcasts | KIT_LIST_BROADCASTS | per_page, after |

| Get broadcast | KIT_GET_BROADCAST | id |

| Get broadcast stats | KIT_GET_BROADCAST_STATS | id |

| Delete broadcast | KIT_DELETE_BROADCAST | id |

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