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Use to create or review a Structured-Prompt-Driven Development REASONS Canvas before code generation: Requirements, Entities, Approach, Structure, Operations, Norms, Safeguards.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
The Pat Helland lens: treat durable data as immutable, append-only facts that carry their own identity and version; and design across service, machine, or org boundaries assuming you cannot have distributed transactions — only idempotent, at-least-once messages that must be reconciled. Apply this on in-place updates and overwrites, "just UPDATE the row," two-phase commit or distributed transactions at scale, exactly-once delivery assumptions, shared mutable state across services, and any data that crosses a boundary of service, machine, org, or time. Trigger even when Helland isn't named — the smell is mutation-in-place and pretending distributed systems can be transactional.
The Rich Hickey lens: pursue simple (un-braided, one role) over easy (familiar, near-at-hand), decomplect concerns that got tangled together, and separate value, identity, state, and time. Apply this whenever "easy," "convenient," or "it's what we already use" is doing the work of justifying a design; when state is braided into logic, policy into mechanism, or data into behavior; when object-soup would be plainer as data; and when a hard design decision is being made at the keyboard under time pressure instead of thought through first. Trigger even when Hickey isn't named — the smell is complecting, and confusing "easy" with "simple."
The John Carmack lens: minimize the mutable state you have to reason about, do the simple thing before the clever one, and treat correctness tooling — static analysis, warnings-as-errors, determinism — as non-negotiable. Apply this on sprawling mutable state, "we'll clean it up later," debugging by print- statement whack-a-mole, silenced compiler warnings, nondeterministic or non-reproducible behavior, premature abstraction, perf work that skips measurement, and any "what should we actually work on" prioritization call. Trigger even when Carmack isn't named — the smell is code whose full set of states you can't hold in your head, and effort that isn't ruthlessly focused.
The Fabrice Bellard lens: build the smallest self-contained thing that fully does the job, get performance from insight instead of hardware, and reuse existing machinery instead of reinventing it. Apply this whenever code is growing dependencies, frameworks, services, or infrastructure to solve a problem that a smaller, sharper implementation could handle — or whenever someone says a thing needs a cluster, a big framework, or a rewrite. Use for size/complexity audits, "do we really need this dependency/service?" questions, performance work where the reflex is to add hardware or caching, green-field "should this be one file or a platform?" decisions, and any moment the answer is trending toward "that's impractical, you'd need X." Trigger even when the user doesn't name Bellard — the smell is scope inflation and reaching for resources over insight.
Use when iteratively researching a topic and filing the synthesis into an Obsidian vault for later ingestion. Output goes to `<vault>/raw/` (NOT directly into wiki pages) so that `vault-ingest` can process it on its own schedule. Triggers: '/vault-autoresearch', 'autoresearch [topic]', 'research [topic] into the vault', 'deep dive into [topic]', 'find everything about [topic] for the vault', 'research and stage'.
Ingest sources into the Obsidian wiki vault. Reads a source, extracts entities and concepts, creates or updates wiki pages, cross-references, and logs the operation. Supports files, URLs, and batch mode. Triggers on: ingest, process this source, add this to the wiki, read and file this, batch ingest, ingest all of these, ingest this url.
| name | spdd-reasons-canvas |
| version | 0.1.0 |
| targets | ["claude-code","codex","gemini","pi"] |
| type | skill |
| description | Use to create or review a Structured-Prompt-Driven Development REASONS Canvas before code generation: Requirements, Entities, Approach, Structure, Operations, Norms, Safeguards. |
| category | {"primary":"workflow","secondary":["backpressure"]} |
Write the executable prompt/spec that governs code generation.
Announce at start: "I'm using the spdd-reasons-canvas skill to turn the aligned analysis into an executable prompt."
# <Change> REASONS Canvas
## R — Requirements
- Problem:
- Definition of done:
- Acceptance criteria:
- Scope out:
## E — Entities
- Domain entities / value objects:
- Relationships:
- State and lifecycle rules:
- External systems:
## A — Approach
- Strategy:
- Trade-offs accepted:
- Alternatives rejected:
- Compatibility / migration approach:
## S — Structure
- Components and files:
- Interfaces / contracts:
- Dependency direction:
- Data flow:
## O — Operations
1. <atomic, testable implementation operation>
2. ...
## N — Norms
- Naming:
- Error handling:
- Observability:
- Testing:
- Repository conventions:
## S — Safeguards
- Security:
- Data integrity:
- Performance:
- Backward compatibility:
- Non-goals the agent must not cross:
Run spdd-abstraction-first against the canvas before spdd-generate. If review changes behavior or design intent, edit the canvas first and re-review the affected sections.