ActiveTrail for AI agents
ActiveTrail is an email and SMS marketing platform for building campaigns, segmenting contacts and running automations. Small and mid-size businesses use it to reach customers directly. 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.
What agents do in ActiveTrail.
Add a contact to a mailing list
Enroll a new contact into a mailing list so they start receiving the right email sequence.
Create an SMS campaign
Set up a new SMS campaign targeting a segment, a write action worth reviewing before it goes out.
Delete a mailing list
Remove an entire mailing list from the account, a destructive action that should be confirmed first.
159 ActiveTrail actions, graded by risk.
Every ActiveTrail action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
104Look things up. Allowed by default.
- activetrail.get_groupGet Group Details
- activetrail.get_orderGet Order
- activetrail.get_webhookGet Webhook by ID
- activetrail.get_templateGet Template
- activetrail.get_webhooksGet Webhooks
- activetrail.get_templatesGet Templates
- activetrail.get_all_groupsGet All Groups
- activetrail.get_automationsGet Automations
- activetrail.get_contact_listGet Contact List
- activetrail.get_mailing_listGet Mailing List
- activetrail.get_signup_formsGet Signup Forms
- activetrail.get_sms_campaignGet SMS Campaign by ID
- activetrail.get_groups_eventsGet Group Events
- activetrail.get_landing_pagesGet Landing Pages
- activetrail.get_mailing_listsGet Mailing Lists
- activetrail.get_segmentationsGet Segmentations
write
40Create and change things. Allow, or ask the user first.
- activetrail.create_orderCreate Order
- activetrail.update_groupUpdate Group
- activetrail.update_orderUpdate Order
- activetrail.create_contactCreate Contact
- activetrail.create_webhookCreate Webhook
- activetrail.update_contactUpdate Contact
- activetrail.update_webhookUpdate Webhook
- activetrail.create_campaignCreate Campaign
- activetrail.update_campaignUpdate Campaign
- activetrail.update_templateUpdate Template
- activetrail.add_group_memberAdd Group Member
- activetrail.create_a_new_groupCreate a New Group
- activetrail.create_segmentationCreate Segmentation
- activetrail.create_sms_campaignCreate SMS Campaign
- activetrail.post_webhooks_test2Send Test Webhook Request
- activetrail.update_segmentationUpdate Segmentation
destructive
15Delete, cancel or archive. Ask first, or deny outright.
- activetrail.delete_contactDelete Contact
- activetrail.delete_webhookDelete Webhook
- activetrail.delete_campaignDelete Campaign
- activetrail.delete_templateDelete Template
- activetrail.delete_automationsDelete Automations
- activetrail.delete_group_by_idDelete group by ID
- activetrail.delete_mailing_listDelete Mailing List
- activetrail.delete_smart_code_siteDelete Smart Code Site
- activetrail.delete_a_member_in_a_groupDelete group member
- activetrail.delete_webhooks_parametersDelete webhook parameter
- activetrail.delete_account_content_categoriesDelete content category
- activetrail.delete_templates_template_categoryDelete template category
- activetrail.remove_external_contact_from_groupRemove external contacts from group
- activetrail.remove_a_contact_from_a_mailing_listRemove Contact from Mailing List
- activetrail.get_account_mergeGet Account Merge Status
ActiveTrail in three steps.
- 01Your users connect ActiveTrailThey add their ActiveTrail api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, writes like “create Order” can wait for the user, and “delete Contact” can be denied outright.
- 03Any agent can actYour agent calls ActiveTrail through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('activetrail', { read: 'allow', write: 'ask', // create_order destructive: 'deny', // delete_contact }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How ActiveTrail connects.
Users add their ActiveTrail api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
The same ActiveTrail 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
- CREDENTIALS
- Per-tenant encrypted vault
- MODEL SEES
- Results only, never credentials
- AUDIT LOG
- Every call, on every plan
Use ActiveTrail from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
ActiveTrail and Arc0, answered.
Can I use ActiveTrail with Claude, ChatGPT or Cursor?
Yes. Connect ActiveTrail 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 ActiveTrail actions you allow.
How do users connect ActiveTrail?
Users add their ActiveTrail api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
Which ActiveTrail actions can my agent take?
159 in total: 104 read, 40 write and 15 destructive, such as “create Order”. Your policies decide which of them each agent may call.
Can I stop my agent from deleting things in ActiveTrail?
Yes. Actions like “delete Contact” 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.
Can my own backend call ActiveTrail too?
Yes. The same ActiveTrail connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug ActiveTrail into your agent.
Your users connect ActiveTrail once, under your brand. Your agent gets 159 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan