Explore MCP server mode (cu mcp serve)

[timimsms]

Context

The MCP (Model Context Protocol) ecosystem has grown significantly:

• 5,800+ MCP servers, 300+ clients
• ClickUp has an official MCP server (public beta at mcp.clickup.com)
• The community ClickUp MCP server (taazkareem/clickup-mcp-server) has ~444 stars
• Industry consensus: CLI + MCP hybrid approach is the winning pattern

A `cu mcp serve` subcommand would make cu unique — a single tool that serves both humans (CLI) and AI agents (MCP). No other project in the ClickUp ecosystem does this.

Concept

```bash

Human use (CLI)

cu task list --status "in progress"

AI agent use (MCP)

cu mcp serve

Exposes cu's capabilities via MCP protocol on stdin/stdout

```

Prerequisites

• Consistent --json output across all commands (Add consistent --json output across all commands #18)
• Research Go MCP SDK options (mcp-go, etc.)
• Design tool schema mapping (cu commands → MCP tools)

Research needed

• What Go MCP SDK libraries exist and are mature?
• What's the minimal viable set of MCP tools to expose?
• How does the official ClickUp MCP server work, and how would cu complement it?
  • Official uses OAuth; cu uses API tokens — different auth models for different use cases
  • cu could work offline/locally with cached data; MCP server is always-online

Priority

This is a future opportunity, not an immediate need. Distribution (#17) and reliability (#19) come first.