Build Inbox Agents from Claude, Cursor & Codex
The Underfive MCP server is live. Connect any Model Context Protocol client and configure AI Inbox Agents, review replies, track conversations, and pull analytics — straight from the tools you already build in.
Works with Any MCP Client
If your AI tool speaks the Model Context Protocol, it speaks Underfive.
Claude
Claude Desktop & Code
Cursor
AI code editor
Codex
OpenAI Codex CLI
Any MCP client
VS Code, Windsurf & more
Connect in Seconds
Add the server as an HTTP MCP endpoint and authenticate with your API key. No local install, no proxy — just point your client at the URL.
- ✓ Remote streamable-HTTP transport — nothing to run locally
- ✓ Authenticate with an
X-API-Keyheader - ✓ Generate and revoke keys anytime from the dashboard
{
"mcpServers": {
"underfive": {
"url": "https://mcp.underfive.ai/mcp",
"headers": {
"X-API-Key": "uf_your_api_key_here"
}
}
}
}What You Can Do
The MCP server exposes your entire Underfive workspace as tools your AI agent can call directly.
Agent Configuration
View your configured AI inbox managers and update their settings and custom instructions — build and tune Inbox Agents without leaving your editor.
Message Management
List pending approval drafts, retrieve AI-drafted replies, and read full thread message histories in real time.
Conversation Tracking
Access threads with live status, meeting outcomes, and performance metrics across every campaign.
Lead Operations
Retrieve leads with global status classifications — active, customer, or do-not-contact — for scoring and enrichment workflows.
Approvals Queue
Surface every reply waiting on a human, review the draft, and keep your approval workflow moving from any MCP client.
Daily Analytics
Generate daily summaries with activity counters and automation-versus-human ratios to report on performance instantly.
Get Started in 4 Steps
From zero to building Inbox Agents in your editor in under five minutes.
Generate a Key
Create an API key in the Underfive dashboard under API Keys.
Add the Server
Point Claude, Cursor, or Codex at the HTTP endpoint.
Authenticate
Pass your key in the X-API-Key header.
Start Building
Ask your AI to configure agents, review replies, and pull analytics.
One key, your whole workspace
A single API key connects your MCP client to every inbox manager, thread, lead, and approval in your Underfive account — so your AI agent can read state and take action without any glue code.
Prefer the REST API?
The same data and actions are available through the Underfive REST API. Full reference, authentication, and endpoint docs live at docs.underfive.ai.
Open API Docs- ✓ MCP connection guide
- ✓ Authentication & API keys
- ✓ Endpoint reference
- ✓ Tool schemas & examples
Start Building on Underfive
Grab an API key, connect your favorite MCP client, and build Inbox Agents from Claude, Cursor, or Codex today.