Break one epic into implementable stories embedding TR-ID, ADR guidance, acceptance criteria. Reads the control manifest. After /create-epics.
65
82%
Does it follow best practices?
Run evals on this skill
Adds up to 20 points to the overall score
Passed
No findings from the security scan
!bash "${CLAUDE_SKILL_DIR}/../../hooks/yaml-helper.sh" resolve_config --keys review_mode,automation,workflow,docs.density,story_granularity,qa.level,system_overrides
Resolved above — use as-is; --review overrides review_mode. No block →
defaults in .claude/docs/config-resolution.md.
A story is a single implementable behaviour — small enough to complete in one focused session, self-contained, and fully traceable to a GDD requirement and an ADR decision. Stories are what developers pick up. Epics are what architects define.
Run this skill per epic, not per layer. Run it for Foundation epics first, then Core, and so on — matching the dependency order.
Output: production/epics/[epic-slug]/story-NNN-[slug].md files
Previous step: /create-epics [system]
Next step after stories exist: /story-readiness [story-path] then /dev-story [story-path] —
at workflow: minimal, /dev-story [story-path] directly (/story-readiness is not on the minimal path)
See .claude/docs/director-gates.md for the full check pattern. Individual gate definitions live in .claude/docs/director-gates/[gate-id].md — the spawned agent reads its own gate file; do not read it in the parent session.
Every AskUserQuestion call follows .claude/docs/automation-modes.md
(collaborative asks always · guided major-only · autonomous logs and proceeds;
automation_always_ask categories always prompt).
workflow for this epic's system (per .claude/docs/workflow-modes.md) —
use the system_overrides row for <system> if the block lists one, else the
project value. <system> is the epic slug / its GDD system. The tier sets which prerequisites block — see the note in Step 2.
story_granularity — it sets each
story's AC load: 5–10 ACs covering a whole feature at coarse (the default, via rigor: minimal), 2–4 ACs
covering one task at balanced (rigor: standard), 1 AC at fine (the story name is
the AC restatement). Group or split ACs into stories to hit the target.
docs.density — it controls the depth of each story's prose (context,
implementation notes, ADR summary), not the AC count (that is
story_granularity) and never the AC text itself. modes.rigor sets it
alongside workflow; set docs.density explicitly to vary story prose alone:
terse (the default, via rigor: minimal) = notes as bullets, no preamble; balanced = short context paragraph +
notes (rigor: standard); thorough = full context, implementation guidance, and ADR
rationale. The embedded TR-ID reference, ADR Version stamp, and acceptance
criteria are structural and are never trimmed by density.
/create-stories [epic-slug] — e.g. /create-stories combat
/create-stories production/epics/combat/EPIC.md — full path also accepted
A named epic that does not exist — if production/epics/[slug]/EPIC.md
(or the given path) is missing, stop at standard/full: "No epic at
production/epics/[slug]/EPIC.md. Run /create-epics to create it, or check
the slug with ls production/epics/." Do not decompose from a guess. At
minimal there are no /create-epics epics to name and that skill is not on
the path — say so, take Step 2's minimal branch, and name the slug it uses.
No argument — at minimal there are no epics yet (Option A): skip to Step 2's
minimal branch and synthesize the epic from design/game-brief.md. At
standard/full, ask "Which epic would you like to break into stories?" and
Glob production/epics/*/EPIC.md to list available epics with their status.
If that glob returns nothing at
standard/full, stop — do not build a question with no options. Report: "No epics found underproduction/epics/. Run/create-epics layer: foundationfirst — an epic is what this skill decomposes."The zero-epic path is load-bearing. Asking which epic and globbing to list them leaves an
AskUserQuestionwith nothing to offer when the glob is empty. Route to/create-epicsinstead — it is named as Previous step in this skill's own header.Note what this skill guarded and what it did not. Step 2's ADR validation is thorough: three tiers, each with its own stop condition, and an explicit message naming the missing file. That is the deepest input. The first input — does an epic exist at all — went unchecked. Guarding the far end of a chain while leaving the near end open is the shape to watch for.
At
minimalthis does not apply: there are deliberately no epics, and the branch above synthesizes one from the brief.
minimaltier — synthesize the epic from the brief (Option A). Atminimalthere is no/create-epicsstep and usually noEPIC.md. Instead: 0. Nodesign/game-brief.md? Stop: "There is no brief to build stories from yet — run/brainstormfirst; it writes the one-page brief." AnEPIC.mdalready atproduction/epics/<slug>/— the named epic, or the brief-title slug (/create-epicsrun anyway, or an earlier run of this skill) — is the epic: use its scope, still traced to the brief, and never rewrite it; Step 6 only appends its Stories table, and the Step 5 ask says updateEPIC.md. Stories already inproduction/epics/<slug>/? This is a return visit —/helpsends a finished build order back here. Never rewrite an existingstory-*.mdor theEPIC.md: read them, add stories only for brief items they do not yet cover (or the new ones the user names), and number on from the highest existingstory-NNN. The one changeEPIC.mdgets is Step 6's: a row per new story appended to its Stories table — existing rows and the rest of the file stay as they are.
- Read
design/game-brief.mdin full (it is one page).- Synthesize an implicit epic (first run only — a return visit keeps the existing one): draft a lightweight
production/epics/<slug>/EPIC.md, where<slug>is the brief's slugified working title (mvpif untitled) — goal = the brief's one-sentence pitch, scope = its MVP feature list, ordering = its Build order. Keep it terse; this is the container/dev-storyand/sprint-statusexpect. It is written in Step 6, with the stories, after the Step 5 ask names it — never before.- Generate one coarse story per MVP feature (Step 3+), in Build-order sequence, each traced to the brief (not a GDD/TR-ID). Leave stories unblocked on ADR grounds — none exist at this tier. Skip the GDD, control-manifest, TR-registry, and ADR reads below (none exist at
minimal), then continue to Step 3 with the synthesized epic.
For standard/full (a /create-epics epic exists), read in full (these are small):
production/epics/[epic-slug]/EPIC.md — epic overview, governing ADRs, GDD requirements tabledesign/gdd/[filename].md) — at full read all 8 sections; at standard the 5 required sections (+ conditional Formulas); at minimal the GDD may not exist — work from the epic brief + acceptance criteria. Always prioritise Acceptance Criteria, Formulas, and Edge Cases where present.docs/architecture/control-manifest.md — grep only this epic's layer (Grep pattern="^## <layer> Layer Rules" path="docs/architecture/control-manifest.md" output_mode="content" -A 40) plus the header Manifest Version date, not a full read of all layersdocs/architecture/tr-registry.yaml — grep only this system's entries (Grep pattern="system: <slug>" path="docs/architecture/tr-registry.yaml" output_mode="content" -B1 -A5, or id: TR-<slug>-), not the whole cross-system registryLoad each governing ADR by section — never with an unbounded full read. A
substantial ADR exceeds the 25k-token Read cap, and a capped read's only
recovery is paging through the remainder — the most expensive possible way to
read a file. Per ADR:
Grep pattern="^## |^### Implementation Guidelines" path="docs/architecture/[adr-file].md" output_mode="content" -nRead(offset, limit) spans that end where the
next section begins:
## Summary and ## Decision (including its ### Implementation Guidelines subsection) — these feed the story's ADR Decision Summary
and Implementation Notes.## Engine Compatibility — feeds the story's Engine, Risk, and Engine
Notes fields. (Engine Notes is a story field derived from this
section — it is not an ADR section name; do not search for one.)## Status and the ## Last Verified date in one call:
Grep pattern="^## (Status|Last Verified|Date)" path="docs/architecture/[adr-file].md" output_mode="content" -A 2Ready vs
Blocked on — never assume it. For the version, use Last Verified,
falling back to Date, then to unversioned if both are absent. This becomes the story's ADR Version stamp — /dev-story
uses it to decide whether it can trust this story's distilled summary
instead of re-opening the ADR.Skip Context, Alternatives Considered, Consequences, Risks, and any
Amendments Log unless a section you loaded explicitly cross-references one of
their entries — then take only the referenced entry with one more bounded
read. If the heading map comes back empty (a nonstandard ADR predating the
template), fall back to one full Read — and if that read truncates at the
cap, do not page through the remainder; grep for the story-relevant
content directly and flag the ADR for
/architecture-decision retrofit [file].
ADR existence validation (tier-gated — resolved in Step 1): After reading the governing ADRs list from the epic, confirm each referenced ADR file exists on disk.
full — if any referenced ADR file cannot be found, stop immediately before decomposing any story.standard — stop only if a critical (Foundation-layer) ADR is missing; for a missing non-critical ADR, warn and continue (the story embeds the ADR reference and is set Status: Blocked until the ADR exists).minimal — no ADR requirement; do not stop. Embed any ADR references that do exist; otherwise decompose against the brief + acceptance criteria and leave stories unblocked on ADR grounds.When stopping (full / standard-critical):
"Epic references [ADR-NNNN: title] but
docs/architecture/[adr-file].mdwas not found. Check the filename in the epic's Governing ADRs list, or run/architecture-decisionto create it. Cannot create stories until all referenced ADR files are present."
At full, do not proceed to Step 3 until all referenced ADR files are confirmed present.
Report: "Loaded epic [name], GDD [filename], [N] governing ADRs [ADR status], [manifest status]." State the actual situation for the resolved tier — e.g. "all confirmed present, control manifest v[date]" at full; "M present, K missing non-critical (embedded + Blocked)" at standard; "no ADRs / manifest required" at minimal. Do not assert "all confirmed present" if any referenced ADR was missing, or name a manifest version when none exists.
Story Type Classification — assign each story a type based on its acceptance criteria:
| Story Type | Assign when criteria reference... |
|---|---|
| Logic | Formulas, numerical thresholds, state transitions, AI decisions, calculations |
| Integration | Two or more systems interacting, signals crossing boundaries, save/load round-trips |
| Visual/Feel | Animation behaviour, VFX, "feels responsive", timing, screen shake, audio sync |
| UI | Menus, HUD elements, buttons, screens, dialogue boxes, tooltips |
| Config/Data | Balance tuning values, data file changes only — no new code logic |
Mixed stories: assign the type that carries the highest implementation risk.
The type determines what test evidence is required before /story-done can close the story.
For each GDD acceptance criterion:
Story sizing rule: size each story to the resolved modes.story_granularity
target (above). The "~2-4 hours / one focused session" heuristic is the
balanced target (rigor: standard) — at coarse, the default, a story spans a whole feature (5–10 ACs,
multi-day), at fine a story is a single AC. Split or group criteria to hit the
resolved target, not a fixed session length.
For each story, determine:
tr-registry.yaml. Use the stable ID. If no match, use TR-[system]-??? and warn.Status: Accepted → embed normallyStatus: Proposed → set story Status: Blocked with note: "BLOCKED: ADR-NNNN is Proposed — accept it with /architecture-decision accept ADR-NNNN once decided"Deprecated or Superseded by ADR-XXXX → set story Status: Blocked with note: "BLOCKED: ADR-NNNN is [status] — point the story at [successor] (edit its ADR field — /create-stories never rewrites an existing story) before implementing"Governing ADRs: field. Designate the one most directly controlling the implementation pattern as primary (first in the list). Others are listed as secondary references.ADR: N/A — [brief reason, e.g. "pure data configuration, no architectural pattern required"] in the story's ADR field. Do NOT leave the field blank — a blank ADR field means "not checked", not "not applicable".Review mode check — apply before spawning QL-STORY-READY:
solo → skip. Note: "QL-STORY-READY skipped — Solo mode." Proceed to Step 5 (present stories for review).lean → skip (not a PHASE-GATE). Note: "QL-STORY-READY skipped — Lean mode." Proceed to Step 5 (present stories for review).full → spawn as normal.After decomposing all stories (Step 4 complete) but before presenting them for write approval, spawn qa-lead once via Agent using gate QL-STORY-READY (.claude/docs/director-gates/ql-story-ready.md). A single call returns both the readiness verdict and the test-case specs — do not spawn qa-lead a second time to generate specs.
Pass: the full story list inline — no story file exists yet, so the stories themselves stand in for the gate's story paths — with each story's acceptance criteria, story type, and TR-IDs with their requirement text from tr-registry.yaml; the epic's GDD acceptance criteria for reference. Require in the return:
Present the assessment, then act on each story's verdict — the gate's own words, handled per .claude/docs/director-gates.md:
AskUserQuestion: Revise flagged criteria / Accept and proceed / Discuss further. Do not revise before the user chooses. On Revise, draft the revised criteria, show them, and re-request specs for just those stories in one follow-up call. On Accept, the criteria stay as written and the story carries no qa-lead specs — its ## QA Test Cases reads *Test cases not yet defined — run /qa-plan to generate them.*/qa-plan line above in its ## QA Test Cases) and mark it QL-STORY-READY: NOT ASSESSED — [input] in the Step 5 list.Untestable criteria cannot be implemented correctly, so a story carries qa-lead specs only once it is ADEQUATE.
Prefer an existing QA plan when one already covers a story — this substitutes for the qa-lead's specs, it does not add a spawn. Glob production/qa/qa-plan-*.md for the most recent file; if it holds test specs for stories in this epic (match titles/slugs in its Automated Tests Required section) that differ from the qa-lead's, use AskUserQuestion (Use QA-plan specs / Use qa-lead specs / Skip and leave *Test cases not yet defined — run /qa-plan to generate them.*). Either way no additional qa-lead spawn occurs.
The spec block formats — Logic/Integration:
Test: [criterion text]
Given: [precondition]
When: [action]
Then: [expected result / assertion]
Edge cases: [boundary values or failure states to test]For Visual/Feel and UI stories, produce manual verification steps instead:
Manual check: [criterion text]
Setup: [how to reach the state]
Verify: [what to look for]
Pass condition: [unambiguous pass description]These test case specs are embedded directly into each story's ## QA Test Cases section. The developer implements against these cases. The programmer does not write tests from scratch — QA has already defined what "done" looks like.
Before writing any files, present the full story list:
## Stories for Epic: [name]
Story 001: [title] — Logic — ADR-NNNN
Covers: TR-[system]-001 ([1-line summary of requirement])
Test required: tests/unit/[system]/[slug]_test.[ext]
Story 002: [title] — Integration — ADR-MMMM
Covers: TR-[system]-002, TR-[system]-003
Test required: tests/integration/[system]/[slug]_test.[ext]
Story 003: [title] — Visual/Feel — ADR-NNNN
Covers: TR-[system]-004
Evidence required: retained screenshot in production/qa/evidence/ + sign-off in production/qa/evidence/[slug]-evidence.md
[N stories total: N Logic, N Integration, N Visual/Feel, N UI, N Config/Data]Use AskUserQuestion:
production/epics/[epic-slug]/, and update production/epics/[epic-slug]/EPIC.md and production/epics/index.md?" — name every file Step 6 touches: at minimal say create EPIC.md only when none exists yet (the Step 2 draft, shown with the stories), and leave index.md out when it does not exist.[A] Yes — write all [N] stories / [B] Not yet — I want to review or adjust firstFor each story, write production/epics/[epic-slug]/story-[NNN]-[slug].md:
At
minimaltier the Context/traceability inputs do not exist (no GDD, ADR, TR registry, or control manifest). Fill the template from the brief instead — apply this mapping exactly, so every run is deterministic rather than improvised:
GDD →
design/game-brief.mdRequirement →
Brief MVP feature N(the feature this story implements — NOT aTR-[system]-NNNID)ADR Governing Implementation / ADR Decision Summary / ADR Version →
N/A (minimal — no ADRs)Manifest Version and Control Manifest Rules (this layer) →
N/A (minimal — no control manifest)Engine and Risk → read
docs/engine-reference/<engine>/VERSION.md(engine fromengine.name). Engine isengine.name+engine.version. Risk is the risk level that file assigns to the pinned version — its post-cutoff timeline row, or its stated overall risk. If the file is missing or assigns no level, writeNOT ASSESSED (no VERSION.md risk rating)— never guess a level.This field is load-bearing and had no rule, so it was improvised.
/dev-storyPhase 3 spawns the engine specialist as a mandatory secondary "when engine risk is HIGH (from the ADR or VERSION.md)". Atminimalthere is no ADR, soVERSION.mdis the only source — and nothing here told this skill to read it. A story written with an inventedRisk: MEDIUMagainst aVERSION.mdrating of HIGH silently disables the specialist review. TreatNOT ASSESSEDas HIGH for the spawn decision: an unknown risk is not a low one.Engine Notes →
none (no ADR engine-compatibility analysis at minimal)The Acceptance-Criteria source line → "From
design/game-brief.md(the Player goal & fail state field + the MVP feature this story implements), scoped to this story" — derive concrete, testable ACs from what the user wrote there rather than inventing them from a bare MVP bulletThe
## QA Test Casessection → at any tier where the QL-STORY-READY / qa-lead gate is skipped (minimal, orlean/soloreview mode) no qa-lead specs are authored; write "N/A — no qa-lead specs at this tier; implement against the Acceptance Criteria above" rather than improvising test cases.Any Test Evidence / DoD line is governed by
qa.level, not this template — atqa.level: minimaltests are waived (advisory, never "must exist and pass"), but a Visual/Feel or UI story's retained screenshot is not.
# Story [NNN]: [title]
> **Epic**: [epic name]
> **Status**: Ready
> **Layer**: [Foundation / Core / Feature / Presentation]
> **Type**: [Logic | Integration | Visual/Feel | UI | Config/Data]
> **Estimate**: [hours or t-shirt size — fill before sprint planning]
> **Manifest Version**: [date from control-manifest.md header]
> **Last Updated**: [set by /dev-story when implementation begins]
## Context
**GDD**: `design/gdd/[filename].md`
**Requirement**: `TR-[system]-NNN`
*(Requirement text lives in `docs/architecture/tr-registry.yaml` — read fresh at review time)*
**ADR Governing Implementation**: [ADR-NNNN: title]
**ADR Decision Summary**: [1-2 sentence summary of what the ADR decided]
**ADR Version**: [the ADR's `## Last Verified` date, else its `## Date`, else `unversioned`]
**Engine**: [name + version] | **Risk**: [LOW / MEDIUM / HIGH]
**Engine Notes**: [from ADR Engine Compatibility section — post-cutoff APIs, verification required]
**Control Manifest Rules (this layer)**:
- Required: [relevant required pattern]
- Forbidden: [relevant forbidden pattern]
- Guardrail: [relevant performance guardrail]
---
## Acceptance Criteria
*From GDD `design/gdd/[filename].md`, scoped to this story:*
- [ ] [criterion 1 — directly from GDD]
- [ ] [criterion 2]
- [ ] [performance criterion if applicable]
---
## Implementation Notes
*Derived from ADR-NNNN Implementation Guidelines:*
[Specific, actionable guidance from the ADR. Do not paraphrase in ways that
change meaning. This is what the programmer reads instead of the ADR.]
---
## Out of Scope
*Handled by neighbouring stories — do not implement here:*
- [Story NNN+1]: [what it handles]
---
## QA Test Cases
*Written by qa-lead at story creation. The developer implements against these — do not invent new test cases during implementation. (At tiers where the QL-STORY-READY gate is skipped — `minimal`, or `lean`/`solo` review mode — no qa-lead specs exist; see the `minimal` mapping note above.)*
**[For Logic / Integration stories — automated test specs]:**
- **AC-1**: [criterion text]
- Given: [precondition]
- When: [action]
- Then: [assertion]
- Edge cases: [boundary values / failure states]
**[For Visual/Feel / UI stories — manual verification steps]:**
- **AC-1**: [criterion text]
- Setup: [how to reach the state]
- Verify: [what to look for]
- Pass condition: [unambiguous pass description]
---
## Test Evidence
*Governed by `qa.level`: at `qa.level: minimal` tests are **waived** (advisory, never "must exist and pass"), but a Visual/Feel or UI story's retained screenshot is not.*
**Story Type**: [type]
**Required evidence**:
- Logic: `tests/unit/[system]/[story-slug]_test.[ext]` — must exist and pass (`/story-done` checks that it EXISTS; pass/fail is established by `/gate-check` and `/smoke-check`, both later)
- Integration: `tests/integration/[system]/[story-slug]_test.[ext]` OR playtest doc
- Visual/Feel: a retained screenshot in `production/qa/evidence/` + sign-off in `production/qa/evidence/[story-slug]-evidence.md`
- UI: a retained screenshot of each screen touched, in `production/qa/evidence/`
- Config/Data: smoke check pass (`production/qa/smoke-*.md`)
**Status**: [ ] Not yet created
---
## Dependencies
- Depends on: [Story NNN-1 must be DONE, or "None"]
- Unlocks: [Story NNN+1, or "None"]production/epics/[epic-slug]/EPIC.mdAt minimal with no EPIC.md yet, this is where the Step 2 draft is written, with the
table below. Otherwise replace the "Stories: Not yet created" line with a
populated table; if the table already exists (a return visit), append a row per
new story and leave the existing rows as they are:
## Stories
| # | Story | Type | Status | ADR |
|---|-------|------|--------|-----|
| 001 | [title] | Logic | Ready | ADR-NNNN |
| 002 | [title] | Integration | Ready | ADR-MMMM |production/epics/index.mdFind the row in the index table matching this epic (by epic name or slug). Set its Stories column to [N] stories, where N is the epic's total story count after this run — the existing rows plus the ones just written, not only the new ones. If the index file does not exist, say so in one line — Epics index not updated: production/epics/index.md absent — and continue. Do not skip silently: the index is what a reader consults to learn which epics have stories, so an un-updated one keeps reporting Not yet created for work that now exists, and nothing else would ever reveal the gap.
Use AskUserQuestion to close with context-aware next steps:
Check:
production/epics/ without stories yet? List them./sprint-plan as an option — except at workflow: minimal, which has no sprints: the brief's build order is the plan.Widget:
production/epics/[epic-slug]/. What next?"[A] Start implementing — run /dev-story [first-story-path] at minimal, /story-readiness [first-story-path] otherwise (Recommended)[B] Create stories for [next-epic-slug] — run /create-stories [slug] (only if other epics have no stories yet)[C] Plan the sprint — run /sprint-plan new (only if all epics have stories, and never at minimal)[D] Stop here for this sessionNote in output: "Work through stories in order — each story's Depends on: field tells you what must be DONE before you can start it."
Applies in collaborative mode (the default). For guided and
autonomous modes, see .claude/docs/automation-modes.md — the rules below
describe what collaborative mode requires, not universal behavior.
After writing (or declining):
production/epics/[epic-slug]/. Run /dev-story (at minimal) or /story-readiness → /dev-story to begin implementation.b21fa0f
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.