Agent skill

gd-design-mechanic

Game mechanics documentation and design. Use when designing core gameplay systems, documenting player actions and responses, balancing game systems, or explaining mechanics to developers.

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SKILL.md

Game Mechanics Design

Mechanics Documentation Template

For each mechanic, document:

markdown
## [Mechanic Name]

### Description
[What the mechanic does in plain language]

### Purpose
[Why this mechanic exists - what player fantasy it fulfills]

### Trigger
[What causes this mechanic to activate]

### Input
[Player controls required]
- Primary: [input]
- Alternative: [input]

### Process
[Step-by-step of what happens]

### Output
[Result of the mechanic]

### Feedback
[Visual/audio cues to player]
- Visual: [what player sees]
- Audio: [what player hears]
- Haptic: [touch feedback]

### Edge Cases
[What happens in unusual situations]
- Edge case 1: [handling]
- Edge case 2: [handling]

### Balance Considerations
[How to keep this fair and fun]
- Tuning lever 1: [description]
- Tuning lever 2: [description]

### Dependencies
- Requires: [other mechanics/systems]
- Blocks: [what this prevents]

Core Mechanics Categories

Movement

Player locomotion through the game world.

Consider:

  • Ground movement (walk, run, crouch, crawl)
  • Aerial movement (jump, double jump, glide, fly)
  • Swimming/water movement
  • Climbing/vaulting
  • Teleportation
  • Speed curves and acceleration

Combat

Player vs player or player vs environment conflict.

Consider:

  • Attack types (melee, ranged, magic)
  • Damage calculation
  • Hit detection
  • Defense/blocking
  • Hit points and damage
  • Death/respawn

Interaction

How players manipulate objects and the world.

Consider:

  • Pick up/drop items
  • Use consumables
  • Open doors/containers
  • Activate switches/levers
  • Talk to NPCs
  • Craft items

Progression

How players advance and grow.

Consider:

  • Experience points
  • Leveling up
  • Skill unlocks
  • Stat increases
  • Equipment acquisition
  • Currency earning

Economy

How resources flow through the game.

Consider:

  • Currency types
  • Earning methods (faucets)
  • Spending methods (sinks)
  • Trading between players
  • Vendor transactions

Mechanics Design Principles

Clarity

Mechanics should be:

  • Discoverable - Players can learn through play
  • Consistent - Same inputs produce same outputs
  • Predictable - Experienced players can plan ahead

Depth

Mechanics should have:

  • Skill ceiling - Room for mastery
  • Counterplay - No unbeatable strategies
  • Variety - Multiple valid approaches

Fairness

Mechanics should be:

  • Balanced - No overpowered options
  • Transparent - Rules are visible
  • Forgiving - Mistakes aren't catastrophic

Common Mechanics Patterns

Rock-Paper-Scissors

Each option has a counter:

A beats B
B beats C
C beats A

Risk/Reward

Higher risk = higher potential reward:

Safe action → Low reward
Risky action → High reward

Resource Management

Limited resources force choices:

Resource pool → Action → Depletion
Regeneration method → Renewal

Progression Gates

Content unlocks over time:

Requirement → Unlock → New content

Balance Documentation

For each mechanic, document balance considerations:

Tuning Levers

Variables that can be adjusted:

Lever Current Range Effect
[Name] [Value] [Min-Max] [Impact]

Counterplay

What beats this mechanic:

Situation Counter Why It Works
[Scenario] [Counter-strategy] [Reasoning]

Mechanics Review Checklist

Before finalizing a mechanic:

  • Purpose is clear
  • Inputs are discoverable
  • Feedback is immediate
  • Edge cases handled
  • Balance levers identified
  • Counterplay exists
  • Fun to use
  • Feels fair
  • Technical feasibility confirmed

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