How to Connect Instantly to Claude (and What It Can't Do)
Instantly’s answer to “does this work with Claude?” is unusually concrete: an official MCP server at https://mcp.instantly.ai/mcp exposing 31 tools across five categories — campaigns (6), leads (11), email (5), analytics (3), and sending accounts (6). Instantly announced it on their blog, documents it in the help center, and even runs a course on wiring it up. The server is included with an Instantly subscription that has API access; on Claude’s side you need a paid plan, since custom connectors aren’t offered free.
Thirty-one tools sounds like an autopilot for cold email. It isn’t, for one structural reason: every one of those tools only runs while you’re in a Claude conversation, on your instruction. Nothing executes between chats.
Wiring it up with an API key
Unlike the OAuth-based servers from lemlist or MailerLite, Instantly authenticates with a personal API key. Generate one under Integrations in your Instantly settings, then in Claude choose Settings → Connectors → Add custom connector and supply the server URL with your key (Instantly accepts it in the URL path or as an Authorization header — the help doc shows both). The key defines the blast radius: Claude can only do what that key permits, and revoking the key kills the connection.
Because it’s key-based, treat the key like a password. Anyone who gets it gets your campaigns and lead lists.
What 31 tools buy a cold emailer
The categories map to how Instantly users actually spend their day. Live analytics without CSV exports. Campaign control — create, update, pause. Lead operations, the biggest group at 11 tools — adding, moving, and managing leads across campaigns. Email tools for viewing, replying to, and verifying messages. And sending-account management, the deliverability backbone of any Instantly setup.
Realistic desk work through the connector:
- “Which campaigns are running reply rates under 2%? Pause the two worst and show me their step-one copy.”
- “Move everyone who replied positively in the agency campaign into the demo-call campaign.”
- “Check my sending accounts — anything with warmup problems or a health score I should worry about before we scale volume?”
For weekly triage sessions that used to mean six exports and a spreadsheet, this is a genuine upgrade.
Where it stops: the midnight reply
Cold email produces its most valuable moments at random hours. A prospect answers “sure, send me pricing” at 12:40am. Instantly logs it in the Unibox, stops the sequence — and then the clock starts running on your reply speed, which every outbound benchmark says decides the meeting rate. Claude, with all five email tools available, does nothing, because a reply arriving is an event and Claude connectors don’t receive events. The same blind spot covers a sending account whose deliverability slides on a Saturday, and a batch of new leads from your scraper that needs verifying and enrolling before Monday’s send window.
Chat-based control, then, not automation. You get an expert operator who only works when you’re standing next to them.
Pairing with Carly for the trigger side
Carly covers exactly the hours Claude can’t. It’s an AI executive assistant that runs cloud-side and starts from triggers — an email arriving, a schedule firing, a lead hitting a list. For an outbound motion built on Instantly, Carly can draft and send the pricing reply from your Gmail or Outlook minutes after the prospect writes back, push fresh leads into the right Instantly campaign as they come in, and drop a deliverability-and-replies summary into your inbox each morning.
There’s no config file: you describe the outcome in plain English — “answer positive outreach replies with our pricing and three call slots” — and Carly interviews you before building the workflow together. AI agents start at $35/month; steps in a workflow that don’t use AI run free and unlimited. Instantly is one of 200+ tools Carly connects to — details on the Instantly integration page, everything else under integrations.
The division of labor
| Claude + Instantly MCP | Carly | |
|---|---|---|
| Live campaign analytics, no CSVs | Yes, in chat | Yes, scheduled reports |
| Pause / update campaigns | Yes, on your command | Yes, in workflows |
| Reply to a hot prospect at 12:40am | No — waits for your next chat | Yes, on the trigger |
| Enroll new leads as they arrive | No | Yes |
| Monitor sending-account health | On request | On a schedule, with alerts to your inbox |
| Runs without you present | No | Yes (cloud) |
| Pricing | Paid Claude plan + Instantly w/ API access | AI agents from $35/mo |
Frequently Asked Questions
Does Claude integrate with Instantly?
Yes — via Instantly’s official MCP server (mcp.instantly.ai/mcp), added to Claude as a custom connector and authenticated with your personal Instantly API key. You need a paid Claude plan and an Instantly plan with API access. All 31 tools work only inside chats you start.
Can Claude reply to Instantly leads automatically when they respond?
No. The MCP includes reply tools, but Claude can’t be woken by an incoming reply — connectors receive no events. Automatic, AI-drafted responses need a trigger-driven agent like Carly.
What exactly do the 31 MCP tools cover?
Five groups: campaigns (create, update, pause — 6 tools), leads (add, move, manage — 11), email (view, reply, verify — 5), analytics (3), and sending accounts (6). Instantly’s help article lists them.
Is the Instantly MCP server free?
Instantly bundles it with subscriptions that include API access — no separate MCP fee. The paid requirement that surprises people is on the Claude side, where custom connectors need a paid plan.
How do I keep outreach moving when I’m not at my desk?
A Claude chat can’t run on a timer or a trigger. Carly executes workflows 24/7 in the cloud — enrolling leads, sending replies, reporting on campaigns as events happen. AI agents start at $35/month.
More: Claude connectors · Can Claude send emails · Claude vs Carly · Claude Cowork alternatives · Best AI email tools · Claude + EmailOctopus · Claude + MailerSend · Claude + Moosend
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