# server

A single MCP server exposing 14 tools for calls, SMS, recordings and numbers. Swap the backend, keep your agent code.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 1
- Author: CallMCP
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/CallMCP/callmcp
- Updated: 2026-07-11
- HTML: https://affpapa.org/en/nevibecode/mcp/callmcp-server

## What it does

CallMCP defines one tool contract: 14 tools with matching schemas and matching error shapes. Hosted backend, local backend, or your own key — the set of tools shifts, their shape does not. Driver quirks go into a namespaced `options.<driver_id>` object, so there is no `make_call_twilio`. A tool is either present for your driver and works per spec, or it is missing from `tools/list`.

Start it with `npx -y @callmcp/server`. Run `npx -y @callmcp/server doctor` before wiring up a live provider, and `npx -y @callmcp/server --sandbox` for a safe walkthrough. With no driver configured the server fails closed, and the mock driver only appears under explicit sandbox settings. Paste-ready configs for Claude Desktop and Claude sit in `examples/`.

Outbound `make_call` and `send_sms` need a valid `approval_id` or an allowlist match, and that check lives in the server core — no driver can skip it. Approval normally runs through MCP elicitation; clients without it get a single-use link instead. Number provisioning (`search_numbers`, `buy_number`, `configure_number`) is not gated on a human and can settle cost through x402 when a driver wants prepayment.

## Requirements
- Needs: Node.js (commands run via npx)
- Environment variables: `CALLMCP_CONFIG`, `CALLMCP_DEFAULT_DRIVER` — keys and tokens: ask the human for the values, never commit them or put them in shared files.

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add --env CALLMCP_CONFIG=<CALLMCP_CONFIG> --env CALLMCP_DEFAULT_DRIVER=<CALLMCP_DEFAULT_DRIVER> --transport stdio callmcp-server -- npx -y @callmcp/server
```
Replace <…> with your own values

### Codex

**Platform CLI**
```bash
codex mcp add callmcp-server --env CALLMCP_CONFIG=<CALLMCP_CONFIG> --env CALLMCP_DEFAULT_DRIVER=<CALLMCP_DEFAULT_DRIVER> -- npx -y @callmcp/server
```
Replace <…> with your own values

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "callmcp-server": {
            "command": "npx",
            "args": [
                "-y",
                "@callmcp/server"
            ],
            "env": {
                "CALLMCP_CONFIG": "<CALLMCP_CONFIG>",
                "CALLMCP_DEFAULT_DRIVER": "<CALLMCP_DEFAULT_DRIVER>"
            }
        }
    }
}
```
Replace <…> with your own values

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "callmcp-server": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "@callmcp/server"
            ],
            "env": {
                "CALLMCP_CONFIG": "<CALLMCP_CONFIG>",
                "CALLMCP_DEFAULT_DRIVER": "<CALLMCP_DEFAULT_DRIVER>"
            }
        }
    }
}
```
Replace <…> with your own values

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add -e CALLMCP_CONFIG=<CALLMCP_CONFIG> -e CALLMCP_DEFAULT_DRIVER=<CALLMCP_DEFAULT_DRIVER> callmcp-server npx -y @callmcp/server
```
Replace <…> with your own values

## When to use it
- place a call from an agent with approval before dialing
- send SMS without glue code per provider
- buy and configure a number inside the agent session
- stream a call transcript as it happens
- switch call providers without rewriting agent code

## Example prompts
- Search my account for an available number and show what it costs
- Call `+1...` and read out the meeting reminder — ask for approval first
- Send the access code by SMS to a number on the allowlist

## Similar
- [AgentPhone](https://affpapa.org/en/nevibecode/mcp/agentphone.md) — MCP server · ★ 124
- [JustCall MCP Server](https://affpapa.org/en/nevibecode/mcp/justcall-mcp-server.md) — MCP server · ★ 25
- [create-phone-number](https://affpapa.org/en/nevibecode/skills/create-phone-number.md) — skill · 941 installs
- [phone-calls](https://affpapa.org/en/nevibecode/skills/phone-calls.md) — skill · 380 installs
- [Deyaho Phone Calls MCP](https://affpapa.org/en/nevibecode/mcp/deyaho-phone-calls-mcp.md) — MCP server
- [create-call](https://affpapa.org/en/nevibecode/skills/create-call.md) — skill · 1000 installs

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md