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codex-game-studios/standards/design-docs.md

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---
paths:
- "design/gdd/**"
---
# Design Document Rules
These rules apply to per-system GDDs under `design/gdd/**`.
`design/gdd/game-concept.md` uses
`references/studio-docs/templates/game-concept.md` and is not a per-system GDD.
If `design/gdd/game-pillars.md` exists, it uses
`references/studio-docs/templates/game-pillars.md` and is also not a
per-system GDD.
- Every design document MUST contain these 8 sections: Overview, Player Fantasy, Detailed Rules, Formulas, Edge Cases, Dependencies, Tuning Knobs, Acceptance Criteria
- Formulas must include variable definitions, expected value ranges, and example calculations
- Edge cases must explicitly state what happens, not just "handle gracefully"
- Dependencies must be bidirectional — if system A depends on B, B's doc must mention A
- Tuning knobs must specify safe ranges and what gameplay aspect they affect
- Acceptance criteria must be testable — a QA tester must be able to verify pass/fail
- No hand-waving: "the system should feel good" is not a valid specification
- Balance values must link to their source formula or rationale
- Design documents MUST be written incrementally: create skeleton first, then fill
each section one at a time with user approval between sections. Write each
approved section to the file immediately to persist decisions and manage context