Fen Ecosystem

SkillDev tools

Context for the Mechanic/Fen WoW addon development ecosystem. Covers all components (Mechanic, FenCore, FenUI, MechanicLib), their relationships, and AFD principles. Load this at the start of addon work. Triggers: ecosystem, fen, fencore, fenui, mechanic, addon, context.

Available today. Use it from your connected AI after setup.

No other account needed.

Connect ahel once, and every AI you use reads what you have installed.

Then ask your AI: use the Fen Ecosystem skill

What this skill tells your AI

The instructions your AI receives, as published by falkicon/mechanic in .agent/skills/k-ecosystem/SKILL.md and read by ahel’s review.

The Mechanic/Fen ecosystem is a unified platform for WoW addon development.

The Reload Loop (MANDATORY)

After ANY addon code change, you MUST verify the changes in-game:

Ask the user to /reload in WoW (or trigger via keybinding CTRL+SHIFT+R)
Wait for the user to confirm the reload is complete
Then use the addon.output MCP tool (agent_mode=true) to get errors, tests, and console logs

CRITICAL: Do NOT call addon.output immediately after changes. The timing between reload and SavedVariables sync is unpredictable. Always wait for user confirmation.

Ecosystem Components

Component	Purpose	Key Tools
Mechanic	Development hub (CLI, MCP, Dashboard)	`env.status`, `addon.output`, `addon.lint`, `addon.test`
FenCore	Pure logic library (no UI dependencies)	`fencore.catalog`, `fencore.search`, `fencore.info`
FenUI	UI widget library (frames, layouts)	`Layout`, `Panel`, `Tabs`, `Grid`, `Buttons`
MechanicLib	Bridge library (addon ↔ Mechanic)	`RegisterAddon`, `Print`, `RegisterTest`

Component Relationships

┌─────────────────────────────────────────────────────┐
│                    Your Addon                        │
├─────────────────────────────────────────────────────┤
│  Core Layer     │  Bridge Layer   │  View Layer     │
│  (Pure Logic)   │  (Events/Data)  │  (UI Frames)    │
│                 │                 │                 │
│  Uses: FenCore  │  Uses: Ace3     │  Uses: FenUI    │
└─────────────────────────────────────────────────────┘
         │                 │                 │
         └────────────┬────┴─────────────────┘
                      │
              ┌───────▼───────┐
              │  MechanicLib  │  (Registers addon with Mechanic)
              └───────┬───────┘
                      │
              ┌───────▼───────┐
              │   Mechanic    │  (Development hub)
              └───────────────┘

Essential MCP Tools

Task	MCP Tool
Get Addon Output	`addon.output(agent_mode=true)`
Lint Code	`addon.lint(addon="MyAddon")`
Run Tests	`addon.test(addon="MyAddon")`
Search APIs	`api.search(query="Spell")`
Search FenCore	`fencore.search(query="clamp")`
Env Status	`env.status()`

AFD Core Principles

Mechanic follows Agent-First Development (AFD) — github.com/Falkicon/afd

Tool-First: All functionality exists as an MCP tool before any UI
Structured Results: Tools return predictable JSON with success, data, error
Agent Mode: Use agent_mode=true for AI-optimized output

Related Knowledge

k-mechanic - Deep dive into Mechanic tools
k-fencore - FenCore library details
k-fenui - FenUI widget library

Signals

GitHub stars: 20
Forks: 5
Last commit: Sep 2026

Advanced

Catalog kind: skill
Gateway key: k-ecosystem
Source: github.com/falkicon/mechanic

github.com/falkicon/mechanic

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