Lobby — AI Receptionist Toolkit (MCP server)

The official MCP server for Lobby — the bilingual AI front desk. It gives any AI agent seven free, no-auth receptionist tools, served remotely over Streamable HTTP. No key, no signup, no install.

https://lobbyvoices.com/api/mcp

Connect

Claude Code

claude mcp add --transport http lobbyvoices https://lobbyvoices.com/api/mcp

Cursor · Claude Desktop · any MCP client

{
  "mcpServers": {
    "lobbyvoices": { "url": "https://lobbyvoices.com/api/mcp" }
  }
}

Tools

Tool	What it does
write_phone_script	Writes a business phone script — greeting, voicemail, on-hold, or jingle — in English, Mexican Spanish, or both. Ready to record.
write_ivr_menu	Builds a complete IVR / phone-menu script: greeting, numbered options, optional press-9 Spanish switch, operator line.
generate_elevenlabs_agent_prompt	Generates a production-grade system prompt for an ElevenLabs conversational agent acting as a phone receptionist.
calculate_missed_call_cost	Computes the revenue a business loses to missed calls (monthly + yearly) plus recovery math, break-even days, and ROI.
simulate_receptionist_call	Role-play a call against the receptionist call engine — you play the caller, get the transcript, outcome, and automatic EN/ES switch back.
get_demo_call_number	A real phone number anyone can call right now to hear the receptionist live, with suggested bilingual scripts.
should_i_hire_a_receptionist	Scores a business's phone coverage and returns a verdict — covered, AI front desk, or hybrid — with archetype and leak numbers.

Every tool declares an outputSchema and returns structuredContent, so agents get typed JSON instead of text to parse.

Try it with curl

curl -X POST https://lobbyvoices.com/api/mcp \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"calculate_missed_call_cost","arguments":{"callsPerWeek":75,"missedRatePct":33,"avgJobValue":380}}}'

Also available as a plain REST API

The same capabilities are exposed as a free, no-key HTTP API — see the developer docs and the OpenAPI spec.

Fair use

No auth required. Per-IP rate limits (AI-backed tools: 2 requests/minute; math and template tools are generous) and hard input caps keep the service healthy. Building something bigger on top? Tell us.

About Lobby

Lobby is an AI front desk for small businesses: it answers every inbound call 24/7, books appointments, captures leads, and speaks English and Mexican Spanish — switching mid-call when the caller does. This MCP server runs on the same production stack.