Create Epics

Port provenance: adapted from the pinned upstream source at 984023ddac0d5e27624f2baacde6105e45de375f under MIT; see the repository parity ledger for the exact path and blob.

Create Epics

An epic is a named, bounded body of work that maps to one architectural module. It defines what needs to be built and who owns it architecturally. It does not prescribe implementation steps — that is the job of stories.

Run this skill once per layer as you approach that layer in development. Do not create Feature layer epics until Core is nearly complete — the design will have changed.

Output: production/epics/[epic-slug]/EPIC.md + production/epics/index.md

Next step after each epic: $ai-game-studio:create-stories [epic-slug]

When to run: After $ai-game-studio:create-control-manifest and $ai-game-studio:architecture-review pass.

1. Parse Arguments

Resolve the review mode (once, store for all gate spawns this run):

1. If --review [full|lean|solo] was passed → use that
2. Else read production/review-mode.txt → use that value
3. Else → default to lean

See the installed Codex role-gate protocol for the full check pattern.

Modes:

• $ai-game-studio:create-epics all — process all systems in layer order
• $ai-game-studio:create-epics layer: foundation — Foundation layer only
• $ai-game-studio:create-epics layer: core — Core layer only
• $ai-game-studio:create-epics layer: feature — Feature layer only
• $ai-game-studio:create-epics layer: presentation — Presentation layer only
• $ai-game-studio:create-epics [system-name] — one specific system
• No argument — ask: "Which layer or system would you like to create epics for?"

2. Load Inputs

Step 2a — Summary scan (fast)

text search all GDDs for their ## Summary sections before reading anything fully:

text search pattern="## Summary" glob="design/gdd/*.md" output_mode="content" -A 5

For layer: or [system-name] modes: filter to only in-scope GDDs based on the Summary quick-reference. Skip full-reading anything out of scope.

Step 2b — Full document load (in-scope systems only)

Using the Step 2a grep results, identify which systems are in scope. Read full documents only for in-scope systems — do not read GDDs or ADRs for out-of-scope systems or layers.

Read for in-scope systems:

• design/gdd/systems-index.md — authoritative system list, layers, priority
• In-scope GDDs only (Approved or Designed status, filtered by Step 2a results)
• docs/architecture/architecture.md — module ownership and API boundaries
• Accepted ADRs whose domains cover in-scope systems only — read the "GDD Requirements Addressed", "Decision", and "Engine Compatibility" sections; skip ADRs for unrelated domains
• docs/architecture/control-manifest.md — manifest version date from header
• docs/architecture/tr-registry.yaml — for tracing requirements to ADR coverage
• docs/engine-reference/[engine]/VERSION.md — engine name, version, risk levels

Report: "Loaded [N] GDDs, [M] ADRs, engine: [name + version]."

3. Processing Order

Process in dependency-safe layer order:

1. Foundation (no dependencies)
2. Core (depends on Foundation)
3. Feature (depends on Core)
4. Presentation (depends on Feature + Core)

Within each layer, use the order from systems-index.md.

4. Define Each Epic

For each system, map it to an architectural module from architecture.md.

Check ADR coverage against the TR registry:

• Traced requirements: TR-IDs that have an Accepted ADR covering them
• Untraced requirements: TR-IDs with no ADR — warn before proceeding

Present to user before writing anything:

## Epic: [System Name]

**Layer**: [Foundation / Core / Feature / Presentation]
**GDD**: design/gdd/[filename].md
**Architecture Module**: [module name from architecture.md]
**Governing ADRs**: [ADR-NNNN, ADR-MMMM]
**Engine Risk**: [LOW / MEDIUM / HIGH — highest risk among governing ADRs]
**GDD Requirements Covered by ADRs**: [N / total]
**Untraced Requirements**: [list TR-IDs with no ADR, or "None"]

If there are untraced requirements:

"⚠️ [N] requirements in [system] have no ADR. The epic can be created, but stories for these requirements will be marked Blocked until ADRs exist. Run $ai-game-studio:architecture-decision first, or proceed with placeholders."

Use the available user-input mechanism:

• Prompt: "Shall I create Epic: [name]?"
• Options:
  • [A] Yes, create it
  • [B] Skip this epic
  • [C] Pause — I need to write ADRs first

4b. Producer Epic Structure Gate

Review mode check — apply before spawning PR-EPIC:

• solo → skip. Note: "PR-EPIC skipped — Solo mode." Proceed to Step 5 (write epic files).
• lean → skip (not a PHASE-GATE). Note: "PR-EPIC skipped — Lean mode." Proceed to Step 5 (write epic files).
• full → spawn as normal.

After all epics for the current layer are defined (Step 4 completed for all in-scope systems), and before writing any files, spawn producer with a Codex subagent using gate PR-EPIC (the installed Codex role-gate protocol).

Pass: the full epic structure summary (all epics, their scope summaries, governing ADR counts), the layer being processed, milestone timeline and team capacity.

Present the producer's assessment.

If UNREALISTIC: offer to revise epic boundaries (split overscoped or merge underscoped epics). Revise and re-run the gate before writing.

If CONCERNS, use the available user-input mechanism:

• Prompt: "Producer raised concerns about the epic structure. How do you want to proceed?"
• Options:
  • [A] Proceed as planned — I accept the producer's concerns
  • [B] Revise epic boundaries — split or merge as recommended
  • [C] Stop — I want to reconsider the scope

If [A]: proceed to Step 5. If [B]: revise epic definitions from Step 4 and re-run the producer gate. If [C]: stop. Verdict: BLOCKED — user wants to reconsider epic scope.

Do not write epic files until the producer gate resolves.

5. Write Epic Files

After approval, ask: "May I write the epic file to production/epics/[epic-slug]/EPIC.md?"

After user confirms, write:

production/epics/[epic-slug]/EPIC.md

# Epic: [System Name]

> **Layer**: [Foundation / Core / Feature / Presentation]
> **GDD**: design/gdd/[filename].md
> **Architecture Module**: [module name]
> **Status**: Ready
> **Stories**: Not yet created — run `$ai-game-studio:create-stories [epic-slug]`

## Overview

[1 paragraph describing what this epic implements, derived from the GDD Overview
and the architecture module's stated responsibilities]

## Governing ADRs

| ADR | Decision Summary | Engine Risk |
|-----|-----------------|-------------|
| ADR-NNNN: [title] | [1-line summary] | LOW/MEDIUM/HIGH |

## GDD Requirements

| TR-ID | Requirement | ADR Coverage |
|-------|-------------|--------------|
| TR-[system]-001 | [requirement text from registry] | ADR-NNNN ✅ |
| TR-[system]-002 | [requirement text] | ❌ No ADR |

## Definition of Done

This epic is complete when:
- All stories are implemented, reviewed, and closed via `$ai-game-studio:story-done`
- All acceptance criteria from `design/gdd/[filename].md` are verified
- All Logic and Integration stories have passing test files in `tests/`
- All Visual/Feel and UI stories have evidence docs with sign-off in `production/qa/evidence/`

## Next Step

Run `$ai-game-studio:create-stories [epic-slug]` to break this epic into implementable stories.

Update production/epics/index.md

Create or update the master index:

# Epics Index

Last Updated: [date]
Engine: [name + version]

| Epic | Layer | System | GDD | Stories | Status |
|------|-------|--------|-----|---------|--------|
| [name] | Foundation | [system] | [file] | Not yet created | Ready |

6. Gate-Check Reminder

After writing all epics for the requested scope:

• Foundation + Core complete: These are required for the Pre-Production → Production gate. Run $ai-game-studio:gate-check production to check readiness.
• Reminder: Epics define scope. Stories define implementation steps. Run $ai-game-studio:create-stories [epic-slug] for each epic before developers can pick up work.

Collaborative Protocol

1. One epic at a time — present each epic definition before asking to create it
2. Warn on gaps — flag untraced requirements before proceeding
3. Ask before writing — per-epic approval before writing any file
4. No invention — all content comes from GDDs, ADRs, and architecture docs
5. Never create stories — this skill stops at the epic level

After all requested epics are processed:

• Verdict: COMPLETE — [N] epic(s) written. Run $ai-game-studio:create-stories [epic-slug] per epic.
• Verdict: BLOCKED — user declined all epics, or no eligible systems found.

Codex portability

Use the search, file-editing, shell, user-input, and subagent capabilities available in the active Codex surface. Use PowerShell syntax on Windows and POSIX syntax on macOS/Linux; do not require a Unix compatibility layer on Windows. Inherit the active model and permission mode, and do not weaken approval or sandbox boundaries.