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Use when creating, reviewing, or updating SPEC.md files, running /specout, or entering the ADF SPEC gate.
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Use when creating, reviewing, or updating a BRIEF.md (the quality law for a surface), defining what "good"/shippable means, or setting up a verified autonomous loop.
Use when checking deployment health, investigating errors, reading logs, or working with Tiltfiles. Queries Tilt resource status, logs, and manages dev environments.
Use when starting tilt, debugging Tiltfile errors, or bootstrapping a dev environment. Starts Tilt in zmx, monitors bootstrap to healthy state, fixes Tiltfile bugs without hard-coding or fallbacks.
Use when creating commits, managing branches, opening PRs, or rewriting history. Not for non-git implementation tasks or repo-specific release policy decisions.
Use when syncing a feature branch onto the latest origin base branch via git rebase.
Fetch latest from origin, prune remote-tracking refs, delete stale local branches and worktrees, and fast-forward important branches. Use when tidying up a worktree-based repo layout.
| name | spec-best-practices |
| description | Use when creating, reviewing, or updating SPEC.md files, running /specout, or entering the ADF SPEC gate. |
Always SPEC.md. No exceptions for the primary spec file. Not feature.spec.md, not SPEC-feature.md.
Supporting documents linked from a SPEC.md TOC may use descriptive names (e.g., commands.spec.md), but only when a root SPEC.md exists and links to them.
Specs are colocated with the code they describe: root SPEC.md for project scope, apps/foo/SPEC.md for app scope, packages/bar/SPEC.md for package scope.
spec/, docs/specs/, and docs/plans/ directories. Prefer colocated SPEC.md files.SPEC.md and delete the plan doc../commands.spec.md, etc.). Supporting files live alongside the SPEC.md, not in a subdirectory.Specs are freeform markdown. No rigid template, no YAML frontmatter, no required section ordering. These elements must be present:
Problem and solution -- narrative context for why this system/feature exists. Lead with the problem.
Domain model -- types, relationships, data flow. For retroactive specs, derive from inspected code.
Requirements with REQ-* IDs -- every behavioral requirement gets a stable identifier. Format: REQ-{DOMAIN}-{NNN} (e.g., REQ-AUTH-001). Append-only; never renumber. Each requirement is testable and traceable.
Invariants -- conditions that must always hold.
Non-goals -- explicit scope boundary. What this spec intentionally does not cover.
Acceptance criteria -- markdown checklist, not prose:
- [ ] Auth endpoint returns JWT with tier claim
- [ ] Rate limiter rejects >100 req/min per IP
Risk tags (conditional) -- flag high-risk items (schema migrations, auth changes, public API contracts, infra changes) when those risks exist or the ADF PLAN gate requires approval.
Test traceability (conditional) -- REQ-* to test file:line mapping. Added during/after TDD, not at initial authoring.
Evidence-based: read code before writing spec content. Do not invent behavior, signatures, or file paths. For retroactive specs, derive requirements from the actual implementation.
Calibrate claim strength to enforcement: match absolutist words ("unrepresentable", "cannot", "structurally caught", "any regression trips the check") to what the check actually proves. If a reviewer can construct a counterexample in under 60 seconds (comment decoy, string literal, shadowed binding, computed path), the SPEC is overclaiming. Either tighten the check, narrow the claim (e.g., "closes the literal-spawn regression; comment/string/shadow-binding cases are covered by the companion test"), or record the gap as an open item. Conservative phrasing backed by evidence beats strong phrasing that invites reject cycles.
Retroactive specs are first-class: documenting existing behavior is valid and encouraged. Read the implementation, extract requirements from actual behavior, note inconsistencies as open items (not silent omissions), map traceability to existing tests.
Mutation policy: do not edit a spec without explicit user direction. When spec/implementation drift is found, surface it immediately. Never silently tolerate or fix drift — the user decides whether to update spec or code.
Spec vs. plan: specs describe what and why; plans describe how and when. Plans are ephemeral. Absorb durable decisions into the spec; delete the plan doc.
Creation (SPEC gate): see ADF SPEC gate in CLAUDE.md for gate requirements. Determine placement, read existing file and identify gaps (or create at the correct colocated path), ensure all required elements are present.
Maintenance: update spec when behavior changes; append new REQ-* IDs, never renumber; add test traceability as tests are written; cross-check spec against implementation whenever both are in context and surface drift.
Retirement: when a feature is removed, remove or archive its SPEC.md. Do not leave stale specs describing deleted behavior.