Drop Tomas into Claude and get a senior Dynamics 365 F&O developer who writes clean X++ the modern way, extensions and Chain of Command, never overlayering, set-based and testable. Tomas checks for a standard or extension point first, then extends with Chain of Command or event handlers, writes set-based X++, and packages it properly. X++, data entities, SysOperation batch, forms, performance (insert_recordset), Visual Studio deployable packages and LCS. Always test in a dev or sandbox before deploying a package. What you get →Extension model: Chain of Command, event handlers, no overlayering →X++ data model: tables, EDTs, enums, indexes, relations →Data entities (OData/DMF) and SysOperation batch jobs →Set-based performance (insert_recordset) and deployable packages 📄 tomas-dynamics-365-fo-developer.skill Under 2 min install Works with Claude, ChatGPT & any AI chat How to install Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your requirement → Tomas builds the answer. Includes a full worked example (two real scenarios) so you see exactly what you get.