Lemlist for AI agents
Lemlist is a multichannel outreach tool that automates personalized email, LinkedIn, and call sequences for sales teams running prospecting campaigns. 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 Lemlist.
Check a campaign's performance
Pull open, reply, and click stats for a campaign to report on outreach results.
Look up a lead by email
Retrieve a lead's activity and messages by email address before a rep follows up.
Approve before unsubscribing a lead
Require approval before unsubscribing a lead from a campaign, since it stops all future outreach to them.
54 Lemlist actions, graded by risk.
Every Lemlist action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
29Look things up. Allowed by default.
- lemlist.get_userGet User
- lemlist.get_labelGet Label
- lemlist.list_labelsList Labels
- lemlist.get_team_infoGet Team Info
- lemlist.get_user_infoGet User Info
- lemlist.get_list_tasksList Tasks
- lemlist.list_companiesList Companies
- lemlist.get_all_webhooksGet All Webhooks
- lemlist.get_team_creditsGet Team Credits
- lemlist.get_people_schemaGet People Schema
- lemlist.get_campaign_by_idGet Campaign By ID
- lemlist.get_campaign_statsGet Campaign Stats
- lemlist.get_list_campaignsList Campaigns
- lemlist.list_company_notesList Company Notes
- lemlist.get_companies_schemaGet Companies Schema
- lemlist.get_contact_messagesGet Contact Messages
write
20Create and change things. Allow, or ask the user first.
- lemlist.update_taskUpdate Task
- lemlist.post_pause_leadPause Lead
- lemlist.post_create_taskCreate Task
- lemlist.post_create_labelCreate Label
- lemlist.post_ignore_tasksIgnore Tasks
- lemlist.create_company_noteCreate Company Note
- lemlist.post_pause_campaignPause a running campaign
- lemlist.post_create_campaignCreate Campaign
- lemlist.post_create_scheduleCreate Schedule
- lemlist.post_add_step_to_sequenceAdd Step to Sequence
- lemlist.post_add_variables_to_leadAdd Variables to Lead
- lemlist.post_create_lead_in_campaignCreate Lead In Campaign
- lemlist.post_mark_lead_as_interestedMark Lead As Interested
- lemlist.post_mark_lead_as_not_interestedMark Lead As Not Interested
- lemlist.post_associate_schedule_with_campaignAssociate schedule with campaign
- lemlist.post_mark_lead_as_interested_in_campaignMark Lead As Interested In Campaign
destructive
5Delete, cancel or archive. Ask first, or deny outright.
- lemlist.delete_delete_scheduleDelete Schedule
- lemlist.delete_delete_unsubscribe_emailDelete Unsubscribed Email
- lemlist.delete_unsubscribe_lead_from_campaignUnsubscribe Lead From Campaign
- lemlist.get_get_unsubscribe_emailGet Unsubscribed Email
- lemlist.post_add_unsubscribe_email_domainAdd Unsubscribe Email/Domain
Lemlist in three steps.
- 01Your users connect LemlistThey add their Lemlist api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, writes like “create Company Note” can wait for the user, and “delete Schedule” can be denied outright.
- 03Any agent can actYour agent calls Lemlist through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('lemlist', { read: 'allow', write: 'ask', // create_company_note destructive: 'deny', // delete_delete_schedule }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Lemlist connects.
Users add their Lemlist 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 Lemlist 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 Lemlist from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
Lemlist and Arc0, answered.
Can I use Lemlist with Claude, ChatGPT or Cursor?
Yes. Connect Lemlist 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 Lemlist actions you allow.
How do users connect Lemlist?
Users add their Lemlist 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 Lemlist actions can my agent take?
54 in total: 29 read, 20 write and 5 destructive, such as “create Company Note”. Your policies decide which of them each agent may call.
Can I stop my agent from deleting things in Lemlist?
Yes. Actions like “delete Schedule” 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 Lemlist too?
Yes. The same Lemlist connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Lemlist into your agent.
Your users connect Lemlist once, under your brand. Your agent gets 54 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan