Build a Custom MCP Server for Joule Work Desktop with XSUAA

You have a spreadsheet with business-partner IDs and want to check the names against SAP. In Joule Work Desktop (JWD), a useful request would be: Look up business partner 1000001 in SAP and compare its name with the entry in this spreadsheet. Tell me what differs, include the source system and retrieval time, and leave SAP unchanged. A custom MCP server for Joule Work Desktop can give the assistant the specific SAP tool it needs for that task. Your developers decide what the tool can read, whose permissions it uses, and how much work it may send to SAP. I developed @arc-mcp/xsuaa-auth to make that authentication layer reusable. It connects MCP servers to SAP’s Authorization and Trust Management service, XSUAA, and provides helpers for calling SAP through destinations with the signed-in user’s context. The goal is a shared MCP service with individual user access and centrally managed permissions. The library helps implement the authentication part of SAP’s documented architecture for a…