FenCore

FenCore is a pure logic library for WoW addons: side-effect-free utility functions with no UI dependencies, meant for the Core layer of an addon and testable without WoW. It lives in its own repository and is not vendored in this repo (Mechanic.toc lists it only as an optional dependency), so this skill does not duplicate its API. Ask the commands below instead of guessing function names.

Discovering functions (MCP)

FenCore registers a catalog with MechanicLib when it loads in game; Mechanic syncs it into MechanicDB, and the desktop commands read it from the selected target.

Task	Tool
List every domain and function	fencore-catalog
Search by name or description	fencore-search with query (and optional limit)
Details, params, returns, example	fencore-info with domain and function

All three take the optional diagnostic target (using-mechanic). They return CATALOG_NOT_FOUND when FenCore did not register a catalog in that profile: make sure FenCore is loaded, ask the user to /reload, wait for confirmation, retry.

Using it in an addon

• Check fencore-search before writing a helper; call FenCore directly instead of wrapping it.
• Take the exact access pattern (global versus LibStub) and signatures from fencore-info / FenCore's own README; do not rely on remembered examples.
• Keep FenCore calls in the Core layer. State belongs in the Bridge layer.
• Treat FenCore as optional when the addon should run without it: guard the global/lib lookup like any optional dependency.