JustCall MCP server

What the model can do

JustCall cloud phone system: calls with direction, outcome, agent, contact, duration, notes and the JustCall AI summary; SMS conversations and SMS tags; and the contact list. Can send an SMS, set a call's notes, disposition or rating, create, update or delete a contact, start an AI voice agent call, and create and apply SMS tags.

Reads

• justcall_list_callsCalls in JustCall, newest first: when (UTC), direction and outcome (answered, missed, voicemail), agent, contact and number, duration…
• justcall_list_textsSMS and MMS messages in JustCall, newest first: when (UTC), direction, delivery status, agent, contact and number, and the message text.
• justcall_list_contactsContacts in JustCall: name, number, email, company and notes.
• justcall_list_sms_tagsThe SMS tags in JustCall (id, name, colour, who made it), newest first.

Acts, when you ask

These change something in JustCall. The model is told to use them only when you ask for exactly that, and each one is granted by name: per team on a shared connection, by the owner on a personal one.

• justcall_create_contactCreates a contact in JustCall, for the account owner or with across_team for every agent.
• justcall_send_smsSends an SMS (or MMS with media_urls) from one of the team's JustCall numbers to a contact's phone.
• justcall_update_callSets the agent's notes, the disposition or the rating on a finished JustCall call, which every agent and the call reports then show.
• justcall_update_contactChanges an existing JustCall contact's name, email, company, address, extension or primary number; only the fields passed change…
• justcall_delete_contactPermanently deletes one JustCall contact by its id (only that agent's copy); calls and texts from the number then show no name…
• justcall_start_ai_voice_callHas one of the team's JustCall AI voice agents phone a contact now: the contact's phone rings and the AI holds the conversation, at call rates.
• justcall_create_sms_tagCreates an SMS tag in JustCall, which agents can then put on SMS conversations.
• justcall_tag_sms_threadPuts an existing SMS tag on one SMS conversation in JustCall, which every agent on the line then sees and can filter by.

Connect it

First connect JustCall on Dashboard → Connections, then add Memtro to your client once. The JustCall tools appear alongside the tools of everything else you have connected; nothing is configured per connector.

claude plugin marketplace add memtro-org/claude-memtro
claude plugin install memtro@memtro --config api_key=sk-memtro-...

{
  "mcpServers": {
    "memtro": {
      "url": "https://platform.memtro.com/api/mcp",
      "headers": {
        "Authorization": "Bearer sk-memtro-..."
      }
    }
  }
}

{
  "mcp": {
    "memtro": {
      "type": "remote",
      "url": "https://platform.memtro.com/api/mcp",
      "headers": {
        "Authorization": "Bearer sk-memtro-..."
      }
    }
  }
}

Who may use it

The key identifies the person, and the server offers that person the tools they may use everywhere else in Memtro. A shared JustCall connection is used by the teams an administrator granted it to, tool by tool, on the Permissions page; a personal connection is used by its owner alone, and its tools that act stay off until the owner allows them. See Teams and permissions and Connectors.

Ask it like this

• › Who called from Acme this week, and what happened on each call?
• › Which calls did we miss yesterday?
• › What did we text the Brightwave Ltd contact last month?
• › Who does the number +44 20 7946 0123 belong to?
• › Text Dan Fletcher at Northwind that his engineer arrives at 10:00 tomorrow

Questions

Is this an official JustCall MCP server?

No. It is Memtro's MCP server with Memtro's JustCall connector behind it: the connector reads JustCall through its API with the credentials you connect on Dashboard → Connections, and JustCall publishes nothing here. The same endpoint carries every other system you connect and Memtro's memory tools.

What does it cost?

Nothing on top of Memtro. One price per organisation by its number of users, from $50 a month for up to 10 users after a 7-day free trial, with every connector, the MCP server, jobs and memory included. You bring your own model keys.

Can it change anything in JustCall?

Only when you ask, and only what it has been granted: create a contact in JustCall; send an SMS or MMS from a JustCall number to a contact; set the notes, disposition or rating on a finished JustCall call; update a JustCall contact's name, email, company, address, extension or primary number; delete a JustCall contact; have a JustCall AI voice agent phone a contact who has given written consent; create a JustCall SMS tag; tag a JustCall SMS conversation. Every other tool reads, searches or lists. An administrator grants each acting tool by name per team, and a personal connection acts only after its owner allows it.

Which clients work?

Any MCP client that speaks Streamable HTTP: Claude Code, Cursor, Claude Desktop, OpenCode, Codex, Zed, Windsurf, Cline and the Anthropic and OpenAI SDKs. There is no local process to run; the server is remote and authenticated with your key.

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