Engine Setup

When this skill is invoked:

!bash "${CLAUDE_SKILL_DIR}/../../hooks/yaml-helper.sh" resolve_config --keys workflow

Tier awareness. The workflow tier resolved above governs which design artifact this skill expects and the finish path it recommends in §12:

• minimal — the design artifact is the one-page design/game-brief.md (no GDDs, systems decomposition, or per-system design at this tier). /setup-engine runs first in the minimal path, so a missing brief here is normal, not a gap. The finish path is the 4-step floor.
• standard / full — the design artifact is design/gdd/game-concept.md and the finish path is the full pipeline.

If the block did not render (shell preprocessing disabled), assume minimal (the default).

1. Parse Arguments

Four modes:

• Full spec: /setup-engine godot 4.6 — engine and version provided
• Engine only: /setup-engine unity — engine provided, version will be looked up
• No args: /setup-engine — fully guided mode (engine recommendation + version)
• Refresh: /setup-engine refresh — update reference docs (see Section 10)
• Upgrade: /setup-engine upgrade [old-version] [new-version] — migrate to a new engine version (see Section 11)

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2. Guided Mode (No Arguments)

Read references/2-guided-mode.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

3. Look Up Current Version

Read references/3-version.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

4. Update CLAUDE.md Technology Stack

Read references/4-claude-md-stack.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

5. Populate Technical Preferences

Read references/5-technical-preferences.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

5.5 Populate project.yaml (Primary Config Store)

Read references/5.5-project-yaml.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

6. Determine Knowledge Gap

Read references/6-knowledge-gap.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

7. Populate Engine Reference Docs

Read references/7-reference-docs.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

7.5 Scaffold the Engine Project

Read references/7.5-scaffold.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

8. Verify the CLAUDE.md Import

Read references/8-verify.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

9. Update Agent Instructions

Ask: "May I add a Version Awareness section to the engine specialist agent files?" before making any edits.

For the chosen engine's specialist agents, verify they have a "Version Awareness" section. If not, add one following the pattern in the existing Godot specialist agents.

The section should instruct the agent to:

1. Read docs/engine-reference/<engine>/VERSION.md
2. Check deprecated APIs before suggesting code
3. Check breaking changes for relevant version transitions
4. Use WebSearch to verify uncertain APIs

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10. Refresh Subcommand

If invoked as /setup-engine refresh:

1. Read the existing docs/engine-reference/<engine>/VERSION.md to get the current engine and version
2. Use WebSearch to check for:
   • New engine releases since last verification
   • Updated migration guides
   • Newly deprecated APIs
3. Update all reference docs with new findings
4. Update "Last verified" dates on all modified files
5. Report what changed

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11. Upgrade Subcommand

Read references/11-upgrade.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

12. Output Summary

Read references/12-output-summary.md now and follow it — this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

Guardrails

• NEVER guess an engine version — always verify via WebSearch or user confirmation
• project.yaml is the primary config store (v1.1). Always dual-write engine config to BOTH project.yaml (primary) and technical-preferences.md (legacy mirror). If the two ever diverge, project.yaml is authoritative.
• NEVER overwrite existing reference docs without asking — append or update
• If reference docs already exist for a different engine, ask before replacing
• Always show the user what you're about to change before making CLAUDE.md edits
• If WebSearch returns ambiguous results, show the user and let them decide
• When the user chose GDScript: copy the GDScript CLAUDE.md template from A1 in references/godot-language-config.md exactly. NEVER add "C++ via GDExtension" to the Language field. GDScript projects may use GDExtension, but it is not a primary project language. The godot-gdextension-specialist in the routing table is available for when native extensions are needed — it does not make C++ a project language.

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Appendix A — Godot Language Configuration

Moved out of this file so it costs nothing on non-Godot runs.

When the chosen engine is Godot, read references/godot-language-config.md and use the subsection for the chosen language:

• A1 — CLAUDE.md Technology Stack templates (GDScript / C# / Both)
• A2 — naming conventions
• A3 — engine specialist routing and file-extension tables

Load discipline. On any engine other than Godot, never load it — nothing in Sections 4, 5 or 5.5 needs it, and reading it anyway spends the tokens the split exists to save. On Godot, read it once when you first reach Section 4 and keep using it for Sections 5 and 5.5; do not re-read it at each reference.