Justcall MCP Server

Connect Justcall to Claude, Cursor or any other MCP client and it stops being a tab you switch to. JustCall MCP Server. The justcall mcp server is what makes that connection.

What the server does

The JustCall Model Context Protocol (MCP) Server lets Large Language Models (LLMs) and AI agents make real-world voice calls and send SMS directly through JustCall’s APIs — securely, contextually, and programmatically.

Available tools

The toolset is worth reading before you wire it up, because it tells you what the integration is really for:

• list_calls — Lists all JustCall calls with various filtering options
• get_call — Get a specific JustCall call by ID
• update_call — Update a JustCall call (disposition, notes, rating)
• get_call_journey — Fetch the sequence of events for a specific call
• get_voice_agent_data — Get voice agent data for a specific call (deprecated, use get_voice_agent_call)
• get_voice_agent_call — Retrieve voice agent related data for a specific call
• list_users — List all users/agents in the account
• get_user — Get detailed information for a specific user/agent
• update_user_availability — Update a user's availability status to available or unavailable for calls
• send_sms — Send an SMS/text message to a contact
• list_sms — Retrieve all SMS/text messages
• get_sms — Get detailed information for a specific SMS/text message

Credentials and setup notes

Configuration is passed through the environment: JUSTCALL_API_KEY, JUSTCALL_API_SECRET. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.

Installation

Because this one is hosted, setup is mostly authentication — you point your client at the endpoint and approve access. Nothing runs on your machine, so there is no runtime to keep patched.

Where it fits

Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Justcall's toolset — list_calls, get_call, update_call and 11 more — is a fair guide to whether it matches your workflow. It is maintained by saaslabsco; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

Worth knowing first

• Your data travels to the provider's service, so the usual questions apply about what you send and what they retain.
• With 14 tools registered it takes up a noticeable share of the context window; turn it off in projects that never touch Justcall.
• Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
• Keep per-call confirmation enabled while you learn its behaviour; it is the cheapest safeguard you have.