Claude Code MCP setup for GTM

What your assistant can do with it

• Work in your CRM: read a deal, write the note, set the next task (Attio, HubSpot)
• Run LinkedIn outreach: read replies, stop a lead, build a campaign (HeyReach)
• Search and enrich contacts, check credits before spending (Apollo, Clay)
• Read what the team decided before acting, and post when asked (Slack)

How to connect it

1. Add a hosted server for your user: claude mcp add --transport http -s user <name> <url>.
2. Sign in: in an interactive Claude Code session, run /mcp; or run claude mcp login <name> in a real terminal, then approve the access in the browser page it opens.
3. Check it: claude mcp list should show the server as connected.
4. Open a new session: a server added during a session is only loaded by sessions started afterwards.
5. Test each server with a real read (a record, a campaign, a credit balance) before you rely on it.

How we use it

Every working session we open on Enjyn's sales starts with the same servers: Attio for the CRM, HeyReach for LinkedIn, Slack for what the team decided, Apollo for contacts. Claude reads the deal, the conversation and the channel before it writes anything, and a rules file tells it what it may do alone and what needs our OK, like sending a message.

Where it breaks

• The sign-in command needs a real terminal: launched from a script it stops with an error about stdin not being a terminal.
• Some servers are slow to start. Our self-hosted n8n server took 20 to 35 seconds, more than the default wait; raising the MCP_TIMEOUT environment variable fixed it.
• A server can list its tools and still refuse every call: HeyReach answers the tool list with any key and returns 401 on real calls without the right one.
• Each tool keeps its own limits behind the server: a monthly credit cap per MCP user in Clay, paid company searches in Apollo, missing writes in Attio. Read each server's page before automating with it.
• OAuth can grant more than you need. Check the scopes on the consent page before you approve.

Our take. Worth the twenty minutes: once the CRM, LinkedIn and Slack are connected, Claude works from the real state of each deal instead of what you paste in. Add servers one at a time, test each with a real call, and write down what it may do without asking.

Frequently asked questions