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96 lines
4.5 KiB
Markdown
96 lines
4.5 KiB
Markdown
---
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name: adr-writing
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description: Architecture Decision Record format and rules for the developer agent. Load when the implementation introduces a structural decision worth remembering 6 months later — new pattern, new dependency, deliberate departure from convention, non-obvious schema choice. Skip for naming and file-layout micro-choices. No ADR is the default.
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---
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# ADR — Architecture Decision Record
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Load only when you have a structural decision to record. Default behaviour for any developer is **no ADR**.
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## When to write one
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Yes:
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- New pattern introduced into the codebase (not just used once — recurring).
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- New runtime dependency (npm package, new Supabase extension, external service).
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- Deliberate departure from an existing convention.
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- Non-obvious schema choice (denormalisation, computed column, soft-delete strategy).
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No:
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- File naming, folder placement.
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- A bug fix or refactor with no structural impact.
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- Style decisions already captured by lint/prettier.
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## File naming — namespaced by session + ticket
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Path: `<WORKTREE_PATH>/adr/ADR-<SESSION_SHORT_ID>-<TASK-XXX>-<slug>.md`
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- `<SESSION_SHORT_ID>` is your session id — the prefix of your `BRANCH_NAME` before the `/` (e.g. `BRANCH_NAME=58e4ec51/TASK-004` → `58e4ec51`). It scopes the ADR to this session.
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- `<TASK-XXX>` is the literal ticket id. Together with the session id it forms the namespace — there is no separate sequence number (e.g. `ADR-58e4ec51-TASK-004-supabase-rls-strategy.md`).
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- `<slug>` is kebab-case, ASCII, ≤ 40 chars.
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- One ADR per ticket is the common case. If the same ticket genuinely needs two ADRs, the distinct slugs keep them apart.
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**Why the session+ticket namespace**: in a wave, N developers run in parallel on worktrees branched from the same base. A monotonically-incremented `ADR-NNN-…` scheme makes every worker independently pick the same next number (e.g. all land on `ADR-003`); different slugs hide the collision from `git merge`, so duplicate numbers land in `$CLAUDE_PROJECT_DIR/adr/` silently. `<TASK-XXX>` removes the intra-wave collision; the `<SESSION_SHORT_ID>` prefix removes the cross-session one — ticket numbering restarts at TASK-001 each session, so two sessions both producing a `TASK-004` would otherwise overwrite each other's ADR in the shared `$CLAUDE_PROJECT_DIR/adr/`.
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## Source-code reference
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One comment at the most representative line of the change, pointing at the ADR you just wrote:
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- TS/JS/CSS: `// See adr/ADR-<SESSION_SHORT_ID>-<TASK-XXX>-<slug>.md`
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- Python/SQL/shell: `# See adr/ADR-<SESSION_SHORT_ID>-<TASK-XXX>-<slug>.md`
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No need for more than one reference; reviewers follow the link.
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## Commit
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The ADR + its reference comment go in the same commit as the code they describe (WORKFLOW step 3). Subject:
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```
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docs(TASK-XXX): ADR-<SESSION_SHORT_ID>-<TASK-XXX> <title>
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```
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Reviewers see the ADR alongside the implementation.
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## Template (≤ 25 lines)
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```markdown
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# ADR-<SESSION_SHORT_ID>-<TASK-XXX> — <decision title>
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- **Date**: YYYY-MM-DD
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- **Ticket**: TASK-XXX
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- **Session**: <SESSION_SHORT_ID>
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## Context
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2–4 lines on what made this decision necessary.
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## Decision
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1–3 lines on what was chosen.
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## Consequences
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- Up to 4 bullets: what this enables, costs, locks in.
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## Alternatives considered
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- Up to 3, one line each, with reason for rejection. If none were captured, write `- _Not captured at decision time._` — never invent.
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```
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Keep it short. An ADR longer than 25 lines is a sign that the decision either belongs in code comments or is actually several decisions that should be split.
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## Red Flags
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- An ADR written for a naming, file-placement, or pure-style choice (no ADR is the default).
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- A monotonic `ADR-NNN-…` filename instead of the `ADR-<SESSION_SHORT_ID>-<TASK-XXX>-<slug>` namespace parallel workers collide on the same number.
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- An ADR file written outside the worktree, or committed separately from the code it describes.
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- `Alternatives considered` invented after the fact instead of `- _Not captured at decision time._`.
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- An ADR past 25 lines likely belongs in code comments or is several decisions.
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## Verification
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- [ ] The change is a genuine structural decision (new pattern, dependency, convention departure, non-obvious schema) otherwise no ADR.
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- [ ] Filename is `<WORKTREE_PATH>/adr/ADR-<SESSION_SHORT_ID>-<TASK-XXX>-<slug>.md`.
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- [ ] Exactly one source-code reference comment points at the ADR.
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- [ ] ADR + reference comment are in the same commit as the code, with the `docs(TASK-XXX):` subject.
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- [ ] Body follows the template and is ≤ 25 lines.
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