Codebase-aware development accelerator. Map patterns, plan with understanding, build with parallel agents, review thoroughly.
Use when building features in a codebase that has Fantasia maps (~/.claude/fantasia/<project>/codebase/). This skill teaches how to read and apply mapped patterns when writing new code.
Intelligent model router. Analyzes prompts and selects the optimal Claude model (haiku/sonnet/opus) for your task.
Use this skill when analyzing a prompt or task to determine the optimal Claude model (haiku, sonnet, or opus). Triggers when needing to route tasks, select models for subagents, or optimize cost/quality tradeoffs.