<!-- TIER:1 -- Building MCP Servers An MCP server is a Model Context Protocol endpoint that exposes Celigo Tools and builder-mode APIs as callable tools for external AI agents and MCP clients -- and, optionally, prompt templates, Celigo Storage files, and tools relayed from another MCP server. Concerns when building an MCP server: - Endpoint identity -- unique that, with the account's MCP alias, forms the server's URL - Tool selection -- which Tool resources to expose, each with an MCP-compatible name - API selection -- which builder-mode API resources to expose (script-mode APIs are not supp…