{"slug":"danielvm-git-deepen-architecture","name":"deepen-architecture","description":"Find deepening opportunities in a codebase, informed by the domain language in specs/tech-architecture/tech-stack.md and the decisions in specs/adr/. Use when the user wants to improve architecture, find refactoring opportunities, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable.","long_description":"---\nname: deepen-architecture\nmodel: sonnet\ndescription: \"Find deepening opportunities in a codebase, informed by the domain language in specs/tech-architecture/tech-stack.md and the decisions in specs/adr/. Use when the user wants to improve architecture, find refactoring opportunities, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable.\"\n---\n\n# Deepen Architecture\n\nSurface architectural friction and propose **deepening opportunities** — refactors that turn shallow modules into deep ones. The aim is testability and AI-navigability.\n\n**Distinct from `define-language` and `model-domain`:** Use this skill to find module-level refactoring opportunities in the codebase. Use `define-language` to produce a canonical glossary of terms. Use `model-domain` to stress-test a plan through a domain-model interview.\n\n> **HARD GATE** — Deep modules must solve a forcing function, not just be \"nice abstractions.\" If you cannot articulate why the abstraction exists, it is premature.\n\n## Glossary\n\nUse these terms exactly in every suggestion. Consistent language is the point — don't drift into \"component,\" \"service,\" \"API,\" or \"boundary.\" Full definitions in [LANGUAGE.md](LANGUAGE.md).\n\n- **Module** — anything with an interface and an implementation (function, class, package, slice).\n- **Interface** — everything a caller must know to use the module: types, invariants, error modes, ordering, config. Not just the type signature.\n- **Implementation** — the code inside.\n- **Depth** — leverage at the interface: a lot of behaviour behind a small interface. **Deep** = high leverage. **Shallow** = interface nearly as complex as the implementation.\n- **Seam** — where an interface lives; a place behaviour can be altered without editing in place. (Use this, not \"boundary.\")\n- **Adapter** — a concrete thing satisfying an interface at a seam.\n- **Leverage** — what callers get from depth.\n- **Locality** — what maintainers get from depth: change, bugs, knowledge concentrated in one place.\n\nKey principles (see [LANGUAGE.md](LANGUAGE.md) for the full list):\n\n- **Deletion test**: imagine deleting the module. If complexity vanishes, it was a pass-through. If complexity reappears across N callers, it was earning its keep.\n- **The interface is the test surface.**\n- **One adapter = hypothetical seam. Two adapters = real seam.**\n\nThis skill is _informed_ by the project's domain model — `specs/tech-architecture/tech-stack.md` and any `specs/adr/`. The domain language gives names to good seams; ADRs record decisions the skill should not re-litigate. See [CONTEXT-FORMAT.md](../model-domain/CONTEXT-FORMAT.md) and [ADR-FORMAT.md](../model-domain/ADR-FORMAT.md).\n\n## Process\n\n### 1. Explore\n\nRead existing documentation first:\n\n- `specs/tech-architecture/tech-stack.md` (or `specs/tech-architecture/tech-stack.md` + each `specs/tech-architecture/tech-stack.md` in a multi-context repo)\n- Relevant ADRs in `specs/adr/`\n\nIf any of these files don't exist, proceed silently — don't flag their absence or suggest creating them upfront.\n\n**Look-here-first (churn heuristic):** Before organic exploration, rank candidate modules by recent commit frequency. High-churn files are architectural friction magnets — start there.\n\n```bash\nbash scripts/bp-churn-rank.sh --since 90.days --limit 20\n```\n\nThen use the Agent tool with `subagent_type=Explore` to walk the codebase. Don't follow rigid heuristics — explore organically and note where you experience friction:\n\n- Where does understanding one concept require bouncing between many small modules?\n- Where are modules **shallow** — interface nearly as complex as the implementation?\n- Where have pure functions been extracted just for testability, but the real bugs hide in how they're called?\n- Where do tightly-coupled modules leak across their seams?\n- Which parts of the codebase are untested, or hard to test through their current interface?\n\nApply the **deletion test** to anything you suspect is shallow.\n\n### 2. Module Depth score\n\nFor each candidate module, assign a **Module Depth score** (1–5, Ousterhout):\n\n| Score | Meaning |\n|-------|---------|\n| 1 | Shallow — interface complexity ≈ implementation |\n| 3 | Balanced |\n| 5 | Deep — small interface, substantial hidden behavior |\n\nInclude the score in each candidate row. Prioritize score ≤ 2 for deepening.\n\n### 3. Present candidates\n\nPresent a numbered list of deepening opportunities. For each candidate:\n\n- **Files** — which files/modules are involved\n- **Problem** — why the current architecture is causing friction\n- **Solution** — plain English description of what would change\n- **Benefits** — explained in terms of locality and leverage, and how tests would improve\n\n**Use `specs/tech-architecture/tech-stack.md` vocabulary for the domain, and [LANGUAGE.md](LANGUAGE.md) vocabulary for the architecture.**\n\n**ADR conflicts**: if a candidate contradicts an existing ADR, only surface it when the friction is real enough to warrant revisiting the ADR. Mark it clearly. Don't list every theoretical refactor an ADR forbids.\n\nDo NOT propose interfaces yet. Ask the user: \"Which of these would you like to explore?\"\n\n### 4. Grilling loop\n\nOnce the user picks a candidate, drop into a grilling conversation. Walk the design tree with them — constraints, dependencies, the shape of the deepened module, what sits behind the seam, what tests survive.\n\nSide effects happen inline as decisions crystallize:\n\n- **Naming a deepened module after a concept not in `specs/tech-architecture/tech-stack.md`?** Add the term to `specs/tech-architecture/tech-stack.md` — same discipline as `model-domain` (see [CONTEXT-FORMAT.md](../model-domain/CONTEXT-FORMAT.md)). Create the file lazily if it doesn't exist.\n- **Sharpening a fuzzy term during the conversation?** Update `specs/tech-architecture/tech-stack.md` right there.\n- **User rejects the candidate with a load-bearing reason?** Offer an ADR, framed as: _\"Want me to record this as an ADR so future architecture reviews don't re-suggest it?\"_ Only offer when the reason would actually be needed by a future explorer. See [ADR-FORMAT.md](../model-domain/ADR-FORMAT.md).\n- **Want to explore alternative interfaces for the deepened module?** See [INTERFACE-DESIGN.md](INTERFACE-DESIGN.md).\n\n### 5. Import-boundary hygiene (e45s14)\n\nWhen a deepening move **splits or merges modules**, update `specs/import-boundaries.json` (Playwright `DEPS.list` pattern) — declare which `scripts/lib/*.sh` files may `source` which peers. CI enforces via:\n\n```bash\nbash scripts/check-import-boundaries.sh\n```\n\nRun the check before proposing cross-module `source` edges. Convention docs alone do not authorize new imports; the allowlist must list them.\n\n## Verify\n\n→ verify: `test -f specs/import-boundaries.json && bash scripts/check-import-boundaries.sh`\n\n\n\n<!-- story: e07s02 -->\n\n---\n\n# Deepening\n\nHow to deepen a cluster of shallow modules safely, given its dependencies. Assumes the vocabulary in [LANGUAGE.md](LANGUAGE.md) — **module**, **interface**, **seam**, **adapter**.\n\n## Dependency categories\n\nWhen assessing a candidate for deepening, classify its dependencies. The category determines how the deepened module is tested across its seam.\n\n### 1. In-process\n\nPure computation, in-memory state, no I/O. Always deepenable — merge the modules and test through the new interface directly. No adapter needed.\n\n### 2. Local-substitutable\n\nDependencies that have local test stand-ins (PGLite for Postgres, in-memory filesystem). Deepenable if the stand-in exists. The deepened module is tested with the stand-in running in the test suite. The seam is internal; no port at the module's external interface.\n\n### 3. Remote but owned (Ports & Adapters)\n\nYour own services across a network boundary (microservices, internal APIs). Define a **port** (interface) at the seam. The deep module owns the logic; the transport is injected as an **adapter**. Tests use an in-memory adapter. Production uses an HTTP/gRPC/queue adapter.\n\nRecommendation shape: *\"Define a port at the seam, implement an HTTP adapter for production and an in-memory adapter for testing, so the logic sits in one deep module even though it's deployed across a network.\"*\n\n### 4. True external (Mock)\n\nThird-party services (Stripe, Twilio, etc.) you don't control. The deepened module takes the external dependency as an injected port; tests provide a mock adapter.\n\n## Seam discipline\n\n- **One adapter means a hypothetical seam. Two adapters means a real one.** Don't introduce a port unless at least two adapters are justified (typically production + test). A single-adapter seam is just indirection.\n- **Internal seams vs external seams.** A deep module can have internal seams (private to its implementation, used by its own tests) as well as the external seam at its interface. Don't expose internal seams through the interface just because tests use them.\n\n## Testing strategy: replace, don't layer\n\n- Old unit tests on shallow modules become waste once tests at the deepened module's interface exist — delete them.\n- Write new tests at the deepened module's interface. The **interface is the test surface**.\n- Tests assert on observable outcomes through the interface, not internal state.\n- Tests should survive internal refactors — they describe behaviour, not implementation. If a test has to change when the implementation changes, it's testing past the interface.\n\n---\n\n# Interface Design\n\nWhen the user wants to explore alternative interfaces for a chosen deepening candidate, use this parallel sub-agent pattern. Based on \"Design It Twice\" (Ousterhout) — your first idea is unlikely to be the best.\n\nUses the vocabulary in [LANGUAGE.md](LANGUAGE.md) — **module**, **interface**, **seam**, **adapter**, **leverage**.\n\n## Process\n\n### 1. Frame the problem space\n\nBefore spawning sub-agents, write a user-facing explanation of the problem space for the chosen candidate:\n\n- The constraints any new interface would need to satisfy\n- The dependencies it would rely on, and which category they fall into (see [DEEPENING.md](DEEPENING.md))\n- A rough illustrative code sketch to ground the constraints — not a proposal, just a way to make the constraints concrete\n\nShow this to the user, then immediately proceed to Step 2. The user reads and thinks while the sub-agents work in parallel.\n\n### 2. Spawn sub-agents\n\nSpawn 3+ sub-agents in parallel using the Agent tool. Each must produce a **radically different** interface for the deepened module.\n\nPrompt each sub-agent with a separate technical brief (file paths, coupling details, dependency category from [DEEPENING.md](DEEPENING.md), what sits behind the seam). The brief is independent of the user-facing problem-space explanation in Step 1. Give each agent a different design constraint:\n\n- Agent 1: \"Minimize the interface — aim for 1–3 entry points max. Maximise leverage per entry point.\"\n- Agent 2: \"Maximise flexibility — support many use cases and extension.\"\n- Agent 3: \"Optimise for the most common caller — make the default case trivial.\"\n- Agent 4 (if applicable): \"Design around ports & adapters for cross-seam dependencies.\"\n\nInclude both [LANGUAGE.md](LANGUAGE.md) vocabulary and CONTEXT.md vocabulary in the brief so each sub-agent names things consistently with the architecture language and the project's domain language.\n\nEach sub-agent outputs:\n\n1. Interface (types, methods, params — plus invariants, ordering, error modes)\n2. Usage example showing how callers use it\n3. What the implementation hides behind the seam\n4. Dependency strategy and adapters (see [DEEPENING.md](DEEPENING.md))\n5. Trade-offs — where leverage is high, where it's thin\n\n### 3. Present and compare\n\nPresent designs sequentially so the user can absorb each one, then compare them in prose. Contrast by **depth** (leverage at the interface), **locality** (where change concentrates), and **seam placement**.\n\nAfter comparing, give your own recommendation: which design you think is strongest and why. If elemen","tagline":"Find deepening opportunities in a codebase, informed by the domain language in specs/tech-architecture/tech-stack.md and the decisions in specs/adr/. 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