Kit for AI agents

Kit, formerly ConvertKit, is an email marketing platform creators use to manage subscribers, broadcasts, tags, and automations for newsletters, courses, and paid content. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Kit See the 42 actions ↓

MarketingOAuth 2.0MCP + RESTkit.com

AUDIT LOG · KITPOLICY: acme-support

09:41:07 · claude · u_8f2read

kit.list_tags

List Tags✓ allowed · 212ms

09:41:08 · claude · u_8f2read

kit.list_forms

List Forms✓ allowed · 164ms

09:41:09 · claude · u_8f2write

kit.create_tag

Create Tag✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

kit.delete_tag

Delete Tag✕ blocked · policy: deny

EVERY KIT CALL, ON THE RECORD

01 · USE CASES

What agents do in Kit.

Add a subscriber to a form

Add a new email address to a signup form after it comes in from another channel.

Check broadcast open and click stats

Pull click and open stats for a recent broadcast to report on newsletter performance.

Hold subscriber deletion for review

Require approval before deleting a subscriber, since it permanently removes their tags and history.

02 · ACTIONS

42 Kit actions, graded by risk.

Every Kit action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

kit.list_tags
List Tags
kit.list_forms
List Forms
kit.get_account
Get Account
kit.get_broadcast
Get Broadcast
kit.list_segments
List Segments
kit.list_webhooks
List Webhooks
kit.get_subscriber
Get Subscriber
kit.list_sequences
List Sequences
kit.get_email_stats
Get Email Stats
kit.list_broadcasts
List Broadcasts
kit.get_growth_stats
Get Growth Stats
kit.list_subscribers
List Subscribers
kit.get_account_colors
Get Account Colors
kit.list_custom_fields
List Custom Fields
kit.get_broadcast_stats
Get Broadcast Stats
kit.get_creator_profile
Get Creator Profile

+ 5 MORE

write

Create and change things. Allow, or ask the user first.

kit.create_tag
Create Tag
kit.update_tag
Update Tag
kit.create_webhook
Create Webhook
kit.create_broadcast
Create Broadcast
kit.create_subscriber
Create Subscriber
kit.update_subscriber
Update Subscriber
kit.create_custom_field
Create Custom Field
kit.update_custom_field
Update Custom Field
kit.update_account_colors
Update Account Colors
kit.add_subscriber_to_form
Add Subscriber to Form
kit.add_subscriber_to_form_by_email
Add Subscriber to Form by Email
kit.tag_subscriber
Tag Subscriber
kit.filter_subscribers
Filter Subscribers
kit.tag_subscriber_by_email
Tag Subscriber by Email
kit.untag_subscriber_by_email
Untag Subscriber by Email

destructive

Delete, cancel or archive. Ask first, or deny outright.

kit.delete_tag
Delete Tag
kit.delete_webhook
Delete Webhook
kit.delete_broadcast
Delete Broadcast
kit.delete_subscriber
Delete Subscriber
kit.delete_custom_field
Delete Custom Field
kit.remove_tag_from_subscriber
Remove Tag From Subscriber

03 · HOW IT WORKS

Kit in three steps.

01Your users connect KitThey sign in to Kit on Arc0 Connect, under your brand, and approve the access you ask for.
02You set the rulesReads run, writes like “create Tag” can wait for the user, and “delete Tag” can be denied outright.
03Any agent can actYour agent calls Kit through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('kit', {
  read: 'allow',
  write: 'ask',        // create_tag
  destructive: 'deny',  // delete_tag
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Kit connects.

Users sign in to Kit on Arc0 Connect and approve the scopes you request. Build with Arc0’s Kit OAuth app, or bring your own so the Kit consent screen names you. Tokens refresh automatically, and you can export them whenever you want.

The same Kit connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key · OAuth 2.0
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Kit from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More marketing apps.

Meta Ads67 actions

ActiveCampaign298 actions ActiveTrail159 actions

Adobe Marketing Agent12 actions

07 · FAQ

Kit and Arc0, answered.

Q01

Can I use Kit with Claude, ChatGPT or Cursor?

Yes. Connect Kit to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Kit actions you allow.

Q02

How do users connect Kit?

Q03

Which Kit actions can my agent take?

42 in total: 21 read, 15 write and 6 destructive, such as “create Tag”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Kit?

Yes. Actions like “delete Tag” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Kit too?

Yes. The same Kit connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Kit into your agent.

Your users connect Kit once, under your brand. Your agent gets 42 actions behind your policies, with every call on the record.

Connect Kit Browse all apps →

Free to build · MCP + REST · Audit log on every plan