MCP.Market

JustCall MCP Server

online · 100% uptime
by mcp.justcall.host·host.justcall.mcp/justcall-mcp-server·v1.2.0·25 stars
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JustCall MCP Server enables LLMs and AI agents to make voice calls and send SMS via JustCall APIs.

C68/100grade C
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Safety scan
C68/100

full report

Adoption
Growing

25 stars

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JustCall MCP Server tools

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Public scan report

scanner v0.1.10 · 2026-10-01 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 215ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityauth enforced (unknown)9/15
  • Maintenancelast push 204 days ago4/15
  • Maintainer identityendpoint served from the registry-verified namespace domain8/10
Overall 68/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How JustCall MCP Server compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
68/100
higher than 30% of 48,255 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
206 ms
faster than 63% of 30,031 servers
GitHub stars
25
more than 91% of 28,688 servers

Install JustCall MCP Server in Claude Code, Cursor or VS Code

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

What the publisher says

From the JustCall MCP Server repository's README, as published. We do not edit it. Read it on GitHub

JustCall MCP Server

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.

It provides a function-calling interface for conversational AI systems, enabling:

  • 📞 AI-powered calling: Let your LLM initiate, manage, or transcribe calls using JustCall.
  • 💬 Smart messaging: Allow your AI agent to send or respond to SMS within conversations.
  • ⚙️ Seamless integration: Use the MCP standard to connect JustCall’s telephony capabilities with any LLM runtime or orchestration framework.

In short: It gives your LLMs a voice and a phone number — turning chatbots into truly conversational agents.

Claude Desktop Setup

  1. Open Claude Desktop and press CMD + , to go to Settings.
  2. Click on the Connectors tab.
  3. Click on the Add Custom Connector button.
  4. Add name as JustCall and Remote Server Url as https://mcp.justcall.host/mcp.
  5. Now on JustCall from the Connectors list click on Connect button for JustCall.
  6. It will open a JustCall page requesting API key and secret.
  7. Get your JustCall API Key & Secret from the JustCall dashboard ().
  8. Enter the API key and Secret and press Continue, it should redirect back you to Claude.

Claude Web - https://claude.ai

  1. Open connectors url in your Browser - .
  2. Click on the Connectors tab.
  3. Click on the Add Custom Connector button.
  4. Add name as JustCall and Remote Server Url as https://mcp.justcall.host/mcp.
  5. Now on JustCall from the Connectors list click on Connect button for JustCall.
  6. It will open a JustCall page requesting API key and secret.
  7. Get your JustCall API Key & Secret from the JustCall dashboard ().
  8. Enter the API key and Secret and press Continue, it should redirect back you to Claude.

Chat GPT (Only available on Plus, Pro, Business and Enterprise)

  1. Open connectors url in your Browser - .
  2. Click on the Apps & Connectors tab.
  3. Ensure developer mode is enabled in advanced settings
  4. Click on the Create button.
  5. Add name as JustCall and MCP Server Url as https://mcp.justcall.host/mcp. You can skip other fields.
  6. Now on JustCall from the Connectors list click on Connect button for JustCall.
  7. It will open a JustCall page requesting API key and secret.
  8. Get your JustCall API Key & Secret from the JustCall dashboard ().
  9. Enter the API key and Secret and press Continue, it should redirect back you to Chat GPT.

Remote MCP

To connect to JustCall's MCP server remotely:

Streamable HTTP (Recommended)

The default and recommended way to connect is via Streamable HTTP Transport:

  • Connect to https://mcp.justcall.host/mcp from any MCP client using Streamable HTTP Transport
  • Include your JustCall API key as a bearer token in the request headers
  • Example header: Authorization: Bearer :

Authentication & Security

The JustCall MCP Server implements OAuth2 authentication for secure access to all endpoints.

OAuth2 Configuration

The server supports OAuth2 authorization with the following features:

  • Authorization Endpoint: OAuth2 authorization server metadata is available at /.well-known/oauth-authorization-server
  • Grant Type: Authorization code flow with PKCE (Proof Key for Code Exchange)
  • Code Challenge Method: S256 (SHA-256)
  • Token Authentication: All MCP and SSE endpoints require Bearer token authentication

Protected Endpoints

The following endpoints require valid Bearer token authentication:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

JustCall MCP Server: common questions

Is JustCall MCP Server safe?
With care: it is graded C, so read the findings first (68/100). Read the JustCall MCP Server safety report
How do I install JustCall MCP Server?
It runs remotely at mcp.justcall.host. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does JustCall MCP Server need an API key?
Yes. The endpoint refuses requests without credentials; the publisher's docs say how to get them.
Is JustCall MCP Server maintained?
The last commit was 237 days ago (2026-03-12). The latest release is v1.2.0.
Is JustCall MCP Server up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does JustCall MCP Server compare with other MCP servers?
safety score 68/100 (higher than 30% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 206 ms (faster than 63% of 30,031 servers). Full comparison.