Agent skill

k-fencore

Context for FenCore - the pure logic library for WoW addons. Covers utility functions, math helpers, table operations, and environment detection. Load this when working with FenCore or needing utility functions. Triggers: fencore, utility, math, table, logic, pure functions.

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/k-fencore

SKILL.md

FenCore Library

FenCore is a pure logic library for WoW addons - no UI dependencies, just utility functions.

Design Philosophy

  • Pure Functions: No side effects, predictable outputs
  • No UI Dependencies: Works in any layer of your addon
  • Testable: All functions can be unit tested without WoW
  • Documented: Every function has clear input/output contracts

MCP Tools

Task MCP Tool
List All Functions fencore.catalog()
Search Functions fencore.search(query="clamp")
Get Function Details fencore.info(domain="Math", function="Clamp")

Domains

FenCore organizes functions by domain:

Domain Purpose Examples
Math Numeric operations Clamp, Round, Lerp, InRange
Table Table manipulation Copy, Merge, Filter, Map
String String utilities Split, Trim, StartsWith, Format
Color Color manipulation HexToRGB, RGBToHex, Lighten, Darken
Time Time formatting FormatDuration, FormatTime, ParseDuration
Environment WoW detection IsRetail, IsClassic, GetExpansion

Usage Pattern

lua
local FenCore = LibStub("FenCore")

-- Access by domain
local Math = FenCore.Math
local result = Math.Clamp(value, 0, 100)

-- Or direct access
local clamped = FenCore.Math.Clamp(value, 0, 100)

Common Functions

Math

lua
FenCore.Math.Clamp(value, min, max)     -- Constrain value to range
FenCore.Math.Round(value, decimals)      -- Round to decimal places
FenCore.Math.Lerp(a, b, t)              -- Linear interpolation
FenCore.Math.InRange(value, min, max)   -- Check if value in range

Table

lua
FenCore.Table.Copy(tbl)                 -- Shallow copy
FenCore.Table.DeepCopy(tbl)             -- Deep copy
FenCore.Table.Merge(base, override)     -- Merge tables
FenCore.Table.Filter(tbl, predicate)    -- Filter by function
FenCore.Table.Map(tbl, transform)       -- Transform values

Environment

lua
FenCore.Environment.IsRetail()          -- true if retail client
FenCore.Environment.IsClassic()         -- true if classic client
FenCore.Environment.GetExpansion()      -- "TWW", "Classic", etc.
FenCore.Environment.GetBuildInfo()      -- version, build, date

Best Practices

  1. Use for Core layer - FenCore belongs in your addon's pure logic layer
  2. Don't wrap unnecessarily - Call FenCore directly, don't create wrappers
  3. Check domain first - Use fencore.search to find existing functions before writing your own
  4. Prefer pure functions - If you need state, that belongs in Bridge layer

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