INDIVIDUAL MCP TOOL

openphone_get_contact_custom_fields

List the workspace's contact custom-field definitions (name, key, type).

usefulapi.ionone authenticationAvailability not checked

LIVE ENDPOINT

https://openphone.usefulapi.io/mcp

No auth detected

Connect to this endpoint to inspect the live schema for openphone_get_contact_custom_fields and invoke it with your own arguments.

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Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

CONNECT WITH APPROVAL

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.openphone-mcp]
url = "https://openphone.usefulapi.io/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "openphone-mcp": {
      "type": "http",
      "url": "https://openphone.usefulapi.io/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: openphone-mcp
Remote MCP URL: https://openphone.usefulapi.io/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "openphone-mcp": {
      "url": "https://openphone.usefulapi.io/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "openphone-mcp": {
      "type": "http",
      "url": "https://openphone.usefulapi.io/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "openphone-mcp",
  "transport": "streamable-http",
  "url": "https://openphone.usefulapi.io/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

openphone_list_phone_numbers — List the OpenPhone numbers in the workspace (id, number, name, formatted number, assigned users, restrictions).
openphone_list_users — List workspace users (id, email, name, role).
openphone_list_contacts — List contacts in the workspace, optionally filtered by external ids or sources.
openphone_get_contact — Get a single contact by its id, including default fields (name, company, role, emails, phone numbers) and custom fields.
openphone_list_conversations — List conversations (threads), most-recent activity first, optionally filtered by phone number(s), user, and created/updated date ranges.
openphone_list_messages — List messages in a conversation between one of your OpenPhone numbers and one or more participants.
openphone_get_message — Get a single message by its id (starts with 'AC').
openphone_send_message — Send an SMS/text message from one of your OpenPhone numbers to up to 10 recipients.