| name | scaffold-endpoint |
| description | End-to-end orchestrator that builds a complete onion-architecture endpoint (domain + infra-db + usecase + controller) for one feature — and, when you start from a rough idea instead of finished specs, first drives the feature-dev-style upstream design phases that turn that idea into the input artifacts the deterministic scaffold core needs. Two entry modes, auto-detected: (A) **idea-first** — Discovery + Clarifying Questions (AskUserQuestion) → parallel Codebase Exploration (Explore agents) → Architecture Design (Plan agent, constrained to the lean A / onion / OpenAPI-first / sqlc rails) → draft the OpenAPI YAML + SQL migration + domain.md + usecase.md for user review, then run `make gen-api` / `make gen-query`; (B) **specs-ready** (backward-compatible fast path) — jump straight to the core when `docs/spec/<feature>/{domain,usecase}.md` + OpenAPI + SQL already exist. The deterministic core is unchanged: `verify-spec` → `scaffold-domain` → `scaffold-infra-db` → `scaffold-usecase` → `scaffold-controller` → `make fix`/`make test` → runtime curl + o11y. Closes with a Quality Review that reuses the repo's own review skills (`impl-review` + `arch-check` + `test-review`) rather than a generic reviewer. Use when starting a new feature / endpoint end-to-end, when you have only an idea or a requirement and no specs yet, when you want the whole controller→usecase→domain→infra stack built consistently with one consolidated report, or when you want the upstream design phases (clarify → explore → design) before implementing. Do NOT use for modifying a single existing layer (run the specific `scaffold-<layer>` standalone), for a pure spec-template scaffold (`new-spec`), or for a review-only pass (`impl-review` / `arch-check` / `test-review`). Halts (never auto-rollbacks) on any failing phase; each layer keeps its own human-in-the-loop confirmation. |
Scaffold Endpoint
Top-level orchestrator that takes a feature from wherever you are — a rough idea or a finished spec set — to a reviewed, running onion-architecture endpoint. It grafts a feature-dev-style set of upstream design phases (clarify → explore → design → draft the inputs) onto an unchanged deterministic spec-driven core (verify → scaffold each layer → test → curl), and closes with a quality review built from this repo's own review skills.
The core's strength is that it is deterministic: specs + OpenAPI + SQL fully determine the generated code. These upstream phases exist only to produce those inputs when you don't have them yet — it never bypasses or weakens the core.
A Japanese reference translation of this skill is available at SKILL.ja.md in the same directory (not loaded as a skill; for human reference only).
When to Use
- Starting a new feature / endpoint end-to-end — whether you have only an idea, or the 2 specs (
domain.md + usecase.md) + OpenAPI YAML + SQL are already prepared.
- You want the upstream design phases (clarify ambiguities → explore existing patterns → weigh approaches) before any code is written.
- You want all layers built with the same conventions and one consolidated report, then reviewed by
impl-review / arch-check / test-review.
Do NOT use this skill for:
- Modifying a single existing layer — run the specific layer skill (
scaffold-domain / -infra-db / -usecase / -controller) standalone.
- Only scaffolding empty spec templates — that is
new-spec.
- A review-only pass on existing code — run
impl-review / arch-check / test-review directly.
Two Entry Modes (auto-detected in Phase 0)
| Mode | Trigger | Upstream phases (1–4) | Core (Phases 5–7) |
|---|
| A. idea-first | User starts from an idea / requirement; docs/spec/<feature>/ is missing or lacks domain.md/usecase.md | runs — clarify → explore → design → draft inputs | runs |
| B. specs-ready | docs/spec/<feature>/{domain,usecase}.md + OpenAPI gen + sqlc gen already exist | skipped (fast path — backward compatible with the original scaffold-endpoint) | runs |
Mode B is exactly the original behavior. Never force the upstream phases on a user who already has valid inputs; detect and skip. Conversely, never skip straight to verify-spec when the specs don't exist yet — that is the gap the upstream phases fill.
What This Skill Reads / Writes
Reads (always):
docs/spec/<feature>/{domain,usecase}.md — via child skills (lean A: 2 spec files only).- OpenAPI gen + sqlc gen + domain Repository IF — derivation sources for controller / infra (no spec).
.claude/scaffold-spec/lifecycle.md — for the canonical workflow / scaffold execution order.- Layer
README.md + docs/ at runtime (the upstream phases read them as the source of truth for existing patterns; does not hardcode design rules that would drift).
Writes:
- Mode B: nothing directly. All writes happen inside the chained child skills, each within its own scope.
- Mode A (upstream phases, Phase 4 only): draft input artifacts for user review —
openapi/** (OpenAPI YAML), database/migrations/** (new files only) + database/dml/** (SQL), docs/spec/<feature>/{domain,usecase}.md (via new-spec, then filled). These are all inside the AI modification scope in CLAUDE.md. These upstream phases never write Go source; that stays with the core's child skills.
Preconditions for the core (Phases 5+)
These must be true before the core runs. In Mode A they are the output of the upstream phases (Phase 4); in Mode B the user has already satisfied them.
| # | Precondition | Verifier |
|---|
| 1 | domain.md + usecase.md exist under docs/spec/<feature>/ (lean A: 2 spec files only) | verify-spec |
| 2 | Spec format valid + cross-spec references consistent + naming convention satisfied | verify-spec |
| 3 | OpenAPI YAML written and make gen-api produced internal/controller/handler/<path>/gen/ | scaffold-controller precondition |
| 4 | SQL files under database/dml/... written and make gen-query produced sqlc gen files | scaffold-infra-db precondition |
| 5 | DB running + migrated + seeded (DB schema matches the new SQL) | manual: start env with make serve, then make db-init |
| 6 | Boundary interfaces the usecase spec depends on exist under internal/usecase/boundary/ | scaffold-usecase precondition |
If any precondition fails when the core starts, the relevant child skill will surface it and this skill aborts the chain.
Environment note (preconditions 3–5): make gen-query dumps the live DB schema via pg_dump, so the database must be running — make gen-query (and make test) fail with could not translate host name "database" when it is not. Bring the environment up with the dedicated make targets, not raw docker compose: make serve (starts the development profile incl. the database service), then make db-init — which migrates and seeds both the local and test DBs (the test suite assumes seed data exists; piecemeal db-*-migrate-up alone is insufficient) — and only then make gen-query / make gen-api.
Toolchain note (final make fix / make test): if make fix or make lint fails on a tool version mismatch (e.g. golangci-lint reporting "you are using a configuration file for golangci-lint v2 with golangci-lint v1"), do not work around it — align the local toolchain with make install-tools (installs the versions pinned in tools.yaml; run make sync-tools first if tools.yaml itself changed), then re-run. Do not hand-edit PATH or invoke version-specific binaries as a substitute.
Phase 0. Confirm Feature + Detect Mode
MUST call AskUserQuestion immediately after invocation:
- Question: 「対象 feature 名 (kebab-case)」
- Free-text.
Then detect the entry mode:
- Check
docs/spec/<feature>/. If it contains both domain.md and usecase.md and the user's request reads as "scaffold from my ready specs", choose Mode B and go straight to Phase 5.
- Otherwise choose Mode A and run the upstream phases (Phases 1–4). If the directory is missing entirely, that is the normal idea-first start — do not treat it as an error.
If the mode is ambiguous (specs exist but the user is clearly still designing), ask which they want rather than guessing.
Upstream design phases (Mode A only) — Phases 1–4
These upstream phases are grafted from the official feature-dev workflow, but wired to this repo's agents and constrained to its architecture. It reuses the existing Explore and Plan agents rather than introducing new ones.
Phase 1. Discovery + Clarifying Questions
Goal: turn the idea into concrete, unambiguous requirements before any exploration or design.
- Restate the feature request and the problem it solves; confirm scope boundaries with the user.
- Identify the underspecified aspects that matter for an onion endpoint: the resource + its invariants, the operations (and their HTTP shape), error/edge cases, auth (
security:) needs, persistence shape, idempotency / transaction needs, pagination, and backward-compatibility with existing endpoints.
- Present the open questions with
AskUserQuestion (group them; recommend a default per question). Wait for answers — the whole point of this phase is that nothing downstream is guessed. If the user says "whatever you think is best", record your recommendation and get explicit confirmation.
Output: a short requirements summary (kept in the run context; not a committed file) that Phases 2–4 build on.
Phase 2. Codebase Exploration
Goal: ground the design in how this repo already does things, so the new feature integrates seamlessly instead of inventing a parallel pattern.
Launch 2–3 Explore agents in parallel (single message), each on a different aspect, e.g.:
- "Find the endpoint(s) most similar to
<feature> and trace the full controller→usecase→domain→infra flow; return the 5–10 key files."
- "Map the domain + usecase conventions relevant to
<feature> (entity/VO/Repository IF shape, boundary interfaces, DTO mapping); return key files."
- "Identify the OpenAPI + sqlc + DI wiring an endpoint like
<feature> touches (spec layout, migration/dml layout, internal/di/module/*); return key files."
When the agents return, read the key files they surface to build first-hand context. Present a concise summary of the patterns found (with file:line references) before designing.
Phase 3. Architecture Design
Goal: choose how this feature is built within the repo's rails, with the trade-offs made explicit.
Launch the Plan agent (1–3 focuses, e.g. minimal-change / clean-boundaries / pragmatic) to produce candidate approaches. Constrain every approach to the fixed architecture — the design space is within these rails, never around them:
- Onion layering:
controller → usecase → domain; infrastructure implements domain interfaces; no layer bypass (enforced by depguard).
- lean A constitution: only
domain.md + usecase.md are spec-driven; controller is derived from OpenAPI gen, infra from sqlc gen.
- OpenAPI-first for the HTTP contract; sqlc for queries; no new frameworks or architectural patterns (per
CLAUDE.md).
So the approaches differ on repo-legal axes — e.g. where a computed value lives (domain method vs VO), repository vs query-service for a read path, synchronous write vs outbox, pagination style, how invariants are enforced — not on framework-level choices. Present each approach's trade-offs plus your recommendation, then AskUserQuestion for which approach to use.
Phase 4. Draft the Input Artifacts
Goal: produce the core's preconditions as reviewable drafts (per the confirmed design), then hand off to generation.
Following the chosen approach:
- Chain
new-spec to scaffold the domain.md + usecase.md templates, then fill them with the designed content (entities/invariants/behaviors/VOs/Repository methods; usecase interface/DTOs/dependencies/workflow). new-spec only creates identity-level templates — the design content comes from Phases 1–3.
- Draft the OpenAPI YAML under
openapi/** (OpenAPI-first) and the SQL under database/dml/** + a new migration under database/migrations/** (new files only — never edit an existing migration).
- Present the drafts to the user for review (
AskUserQuestion: 「このドラフトで生成に進みますか？」 / 修正指摘 / キャンセル). These are drafts — the user is the author-of-record and must approve before generation.
- After approval, run
make gen-api + make gen-query (DB must be up — see the environment note) so the generated gen/ + sqlc files exist for the core.
Do not hand-write or edit any generated file (*.gen.go, *.sql.go, *_mock.go, openapi.gen.yaml). If a draft can't be completed without a decision only the user can make, stop and ask rather than inventing business content.
When Phase 4 completes, the Phase-5+ preconditions hold and the flow continues into the (unchanged) core.
Core (both modes) — Phases 5–7
Phase 5. Verify Specs (auto-chain)
Invoke the verify-spec skill with the feature name. If verify-spec reports violations > 0, abort the chain:
scaffold can not safely proceed: verify-spec で <N> 件の違反が検出されました。
spec を修正してから再度 /scaffold-endpoint を実行してください。
If only warnings are reported, continue (warnings do not block).
Phase 6. Chain Child Skills in Dependency Order
Invoke each child skill in turn, passing the feature name in context so each child can resolve its spec path automatically:
scaffold-domain — entity + Repository IF + VOs + constants + errors + tests (+ make gen-api for mock).scaffold-infra-db — Repository impl wrapping sqlc gen (requires make gen-query already run, verified internally).scaffold-usecase — Application Service + DTOs + tests (+ make gen-api for Usecase mock).scaffold-controller — Handler implementing ServerInterface + tests.
Between each child skill, propagate the success / failure status:
- Child success → proceed to next.
- Child failure → halt the chain, surface the child's FB summary, do NOT proceed.
Each child skill independently:
- Asks its own plan confirmation
AskUserQuestion (the user approves each layer's plan separately to keep judgment per-layer)
- Invokes its own test-perspective subagent
- Runs
make gen-api if needed
- Writes its own files
- Runs
make fix + make test after its writes
- Surfaces TODO + FB on failure
If you want a "fully unattended" mode, the user can add --auto-approve (future flag) — but the default is to confirm each layer to keep human-in-the-loop on judgment-heavy steps.
Phase 7. Integration Verification (make test + runtime curl + o11y)
After all 4 child skills succeed, run a final consolidated check:
make fix
make test
This confirms the cross-layer integration (handler → usecase → domain → infra) compiles and tests pass as a whole. Surface the per-package coverage line for the 4 packages this scaffold touched. If make test fails here (rare — child skills already ran their own), surface the failure with TODO + FB and stop.
Then run the runtime verification (curl + o11y). make test uses mocked usecases/repositories, so it does NOT construct the real Fx graph, run the HTTP middleware (auth / OpenAPI validation), or touch the DB. A whole class of bugs only surfaces at runtime: a missing security: declaration (endpoint reachable without auth), an unregistered/mis-wired BindHandler, a DI provider mismatch, or a SQL filter that behaves differently against a real DB. This is the correct place to curl — all layers + DI now exist. Per-layer skills cannot do this (their lower layers / DI may be absent, so the app would not even boot).
Preconditions:
make serve is running and the api_server log reached [Fx] RUNNING (the DI boot check from scaffold-controller).make db-init has run (seeds local + test DB — the canonical setup).
Steps:
- Pick or create a target in a known state. If the operation needs an existing row, use a seeded id or create one first via the create endpoint. For credential/state-sensitive checks (e.g. password change), create a row whose plaintext/state you control (a
psql insert with a known bcrypt hash is acceptable for local verification).
- curl the new endpoint(s) (auth header for local:
Authorization: Bearer debug:<subject>) and assert:
- the route is reachable — a non-404-from-router response proves the handler is registered and DI is wired;
- the happy path returns the expected status/body;
- the key error paths: NotFound (404), validation (400/422), and — if the operation declares
security: — no-token ⇒ 401 (verify the endpoint is actually protected);
- the mutation actually took effect (re-read / re-auth with the new state), not merely a 2xx.
- Read the o11y logs once for a single request: confirm the trace spans the full stack (controller → usecase → infra) and the emitted SQL is what you expect. After this one capture, further re-checks can rely on o11y instead of re-curling.
Shared-schema impact: if the change edits a shared OpenAPI component (e.g. a components/schemas/* or components/requests/* referenced by more than one operation), the runtime check must cover every endpoint that references it — not just the new/changed one. Grep the spec for $refs to the edited file and curl each consumer. A shared-schema edit can silently break sibling endpoints the mocked tests never exercise (e.g. removing a property from a base used via allOf, or additionalProperties: false rejecting a sibling's property → POST create breaks while the new endpoint looks fine).
Destructive guard: if a curl mutates data and the only way to restore the prior state is make db-init (or equivalent), confirm with the user before running it (per CLAUDE.md). Clean up any rows you created for verification.
If any check fails, surface TODO + FB and stop (do NOT commit).
Review & closing (both modes) — Phases 8–9
Phase 8. Quality Review (reuse the repo's review skills)
The scaffold + runtime check proves the feature is built and boots. This phase judges whether it is good — using the repo's own review skills rather than a generic reviewer, because they encode this codebase's rules and run reviewers on a different model than the implementer:
impl-review — adversarial correctness / security / architecture / runtime-gap + comment quality on the new change.arch-check — layer-compliance audit across the touched layers (depguard-level boundaries, lean A conventions).test-review — quality of the generated tests (structural compliance + viewpoint coverage + semantic strength).
Run them scoped to this feature's change. Consolidate the findings, surface the highest-severity ones, and AskUserQuestion: 「指摘を今修正 / 後で / このまま進む」. Address per the user's choice. This phase is read-only detection; applying fixes is a deliberate, separately-confirmed step (these reviewers never auto-edit).
Phase 9. Closing
Print a Japanese summary:
scaffold-endpoint 完了（feature: <feature>, mode: <A/B>）。
[Mode A のみ] ✓ 要件整理 / 探索 / 設計案選択 / 入力ドラフト作成 + gen
✓ verify-spec: violations 0
✓ scaffold-domain: <N> ファイル作成、coverage 100%
✓ scaffold-infra-db: <N> ファイル作成、coverage <X>%
✓ scaffold-usecase: <N> ファイル作成、coverage 100%
✓ scaffold-controller: <N> ファイル作成、coverage 100%
✓ make test: 全体 OK
✓ ランタイム動作確認: curl 到達 / 認証 / 主要異常系 / o11y トレース OK
✓ 品質レビュー: impl-review / arch-check / test-review 実施（指摘 <n> 件、対応方針: <...>）
次のアクション:
- /commit で 変更をコミット
- /submit-pr で PR 作成
If any phase failed, output the failure status table with the FB from the failing phase/child, and the user decides whether to fix forward.
Do NOT commit. Do NOT push.
AI Modification Scope
- Mode B: this skill writes no files. All scope is delegated to child skills, each within their own constraints (see their SKILL.md).
- Mode A: additionally, the upstream phases draft input artifacts in Phase 4 — only under
openapi/**, database/dml/**, database/migrations/** (new files only), and docs/spec/<feature>/** (all inside the CLAUDE.md AI modification scope). It never writes Go source and never touches generated files.
Constraints
- ❌ Force the upstream phases (Phases 1–4) when Mode B inputs already exist — detect and skip.
- ❌ Skip straight to
verify-spec when the specs do not exist yet — the upstream phases must produce them first (Mode A).
- ❌ Let an architecture approach (Phase 3) step outside the onion / lean A / OpenAPI-first / sqlc rails — the design space is within them.
- ❌ Invent business content in Phase 4 — draft from the confirmed design; stop and ask on a genuine gap.
- ❌ Edit generated files (
*.gen.go, *.sql.go, *_mock.go, openapi.gen.yaml) or an existing migration.
- ❌ Modify any Go source directly (delegate to child skills).
- ❌ Skip
verify-spec (Phase 5) — it is the safety net for spec consistency.
- ❌ Proceed past a failing child skill — halt and surface FB.
- ❌ Auto-rollback files written by a successful earlier phase/child when a later one fails — the user decides.
- ❌ Skip the feature-confirmation
AskUserQuestion (Phase 0).
- ✅ Japanese user-facing output.
- ✅ Reuse the existing
Explore / Plan agents for the upstream phases (no new agent types).
- ✅ Run child skills in the documented dependency order (domain → infra-db → usecase → controller).
- ✅ Surface a consolidated final report covering every phase that ran + the final
make test.
- ✅ Let each child skill ask its own confirmation per layer (human-in-the-loop on judgment-heavy steps).
- ✅ Run the runtime curl + o11y verification (Phase 7) —
make test alone does not exercise DI / middleware / DB.
- ✅ Reuse
impl-review / arch-check / test-review for the Quality Review (Phase 8), not a generic reviewer.
- ✅ Confirm with the user before any destructive curl whose only restore path is
make db-init.
Checklist
Before reporting completion, confirm:
