Call Desk MCP

A read-only MCP server that validates US and Canadian phone numbers, checks federal and state calling hour compliance, determines recording consent requirements, and verifies AI voice disclosure laws. It provides legal citations and source references for each rule, helping agents ensure calls are legal before dialing.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by Modern Mustard Seed

MCP endpoint (Streamable HTTP)

https://mcp.modernmustardseed.com/call-desk

Vendor documentation

What you can do with it

Validate a phone number's location and toll-fraud risk
Check if a call is legal under current time zone and state laws
Determine recording consent requirements for specific states
Verify AI voice disclosure obligations for automated calls

Tools advertised by the last live check:

check_phone_number
can_i_call_now
recording_consent_rules
ai_voice_disclosure_rules
list_state_calling_rules

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http call-desk-mcp https://mcp.modernmustardseed.com/call-desk

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add call-desk-mcp --url https://mcp.modernmustardseed.com/call-desk

Cursor

Merge this server into .cursor/mcp.json in your project, then enable call-desk-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "call-desk-mcp": {
      "url": "https://mcp.modernmustardseed.com/call-desk"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "call-desk-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.modernmustardseed.com/call-desk",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start call-desk-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "call-desk-mcp": {
      "type": "http",
      "url": "https://mcp.modernmustardseed.com/call-desk"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http call-desk-mcp https://mcp.modernmustardseed.com/call-desk

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "call-desk-mcp": {
      "url": "https://mcp.modernmustardseed.com/call-desk"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "call-desk-mcp": {
      "serverUrl": "https://mcp.modernmustardseed.com/call-desk"
    }
  }
}

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