JustCall MCP Server

by justcall-mcp Your server? Claim it

answering

JustCall MCP Server is answering right now. Last checked 11 min ago. Last commit 12 Mar 2026.

JustCall MCP Server enables LLMs and AI agents to make voice calls and send SMS via JustCall APIs.

Uptime history 51 days of history · worst day 95%

51 days agonow

97.3%

Uptime 24h

177 of 182 checks

—

Tools

hidden behind auth

256 ms

Response time

average over 24h

Stars

last commit 12 Mar 2026

JustCall MCP Server does not always answer

Over the last week it answered 98.4% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add justcall-mcp-server --transport http https://mcp.justcall.host/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "justcall-mcp-server": {
      "url": "https://mcp.justcall.host/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.justcall-mcp-server]
url = "https://mcp.justcall.host/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "justcall-mcp-server": {
      "url": "https://mcp.justcall.host/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "justcall-mcp-server": {
      "url": "https://mcp.justcall.host/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.justcall.host/mcp	streamable-http	needs auth	265 ms	11 min ago
https://mcp.justcall.host/sse	sse	needs auth	262 ms	11 min ago

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JustCall MCP Server — questions

Answers built from our own checks of this server.

Why is there no tool list for JustCall MCP Server?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 97.3% of checks in the last 24 hours got a reply.

Is JustCall MCP Server working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 177 of 182 checks got a reply (97.3%), average response time 256 ms. The bar chart above shows every period we have measured.

How do I connect JustCall MCP Server?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does JustCall MCP Server need an API key?

Yes. Every time we knock, JustCall MCP Server answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is JustCall MCP Server?

It answers our handshake in 256 ms on average, which is faster than 60% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is JustCall MCP Server open source?

Yes — it is published under the MIT licence, written in HTML, 25 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.