Plan Feature — From Issue (internal)

Convert a feature-request issue into the project's planning artifacts, keeping a clean issue → SPEC → PR(Closes #n) trace. Writes the SPEC's product half (same two-halves convention design-feature uses) and must satisfy capability closure before handing off — a thin issue does not get a shortcut around it.

This skill stops at the Product half. It designs, then the unit goes to review-spec for an independent Product review; engineering planning is a different authority's turn. Composing plan-feature-scaffold in the same breath as the design it just wrote is the bypass this separation exists to close — the author of a Product half cannot be the one who decides it is ready to build on.

When to use

• The plan-feature router calls this when the input is a GitHub issue (or --from-issue N) that describes new product capability.

If the issue is a bug or tech-debt, stop and route it: triage-issue to classify, then plan-fix + execute-phase --fix. This skill is for genuine features only.

Step 0 — Discover the project (always first)

Per the agent guide's Workflow conventions + documentation map, then read what THIS skill needs: the feature SPEC template, the roadmap, and the issue/PR templates (.github/ISSUE_TEMPLATE/, .github/PULL_REQUEST_TEMPLATE.md) so the SPEC mirrors the fields reviewers expect. Then read the issue (forge CLI per the project's Workflow conventions — examples use gh):

gh issue view <N> --json number,title,body,labels,state,comments

Process

1. Classify first. Confirm it is a feature. Not a feature if it describes a defect, regression, duplicated code, perf debt, or carries a "when to fix / trigger" clause → hand to triage-issue. State the verdict explicitly.

2. Normalize language. If not in the project's docs language (this repo: English), translate before drafting any artifact.

3. Map to the roadmap. Assign the next number + slug. Identify dependencies and conflicts with existing features, coupling/migration risks, and whether it should instead extend an existing feature.

4. Close product-half gaps proactively. Compare the issue against what a complete SPEC product half needs (goals, scope in/out, business goals, i18n/SEO/a11y/pricing per the docs map, a UI design reference when the feature has a UI surface), probing the same fixed vagueness rubric design-feature's interview uses: affected users/roles · error & edge states · data shape · boundaries & limits · out of scope · success criteria — each slot filled or explicit n/a: <reason>. For each genuine gap you can't safely default, ask the user one question per turn, never batched, each with a recommended default; never ask what the issue or docs already answer. Structural hand-off threshold: if ≥ 3 rubric slots remain unfillable from the issue plus the answers so far, stop and hand the feature to design-feature (the thin-issue rule below, now with a fixed trigger) instead of continuing to interview here.

5. Satisfy capability closure. Walk the same fixed checklist design-feature uses (per entity: CRUD + state transitions, each with UI + API + test, or explicit n/a: <reason>; per capability: entry point + ACL; per role: assigned/revoked/viewed where) into the SPEC's ## Capability closure and ## Acceptance criteria. A thin issue that doesn't carry enough to fill it is not a shortcut around the gate — hand it to design-feature (compose in-turn only at ≥ this skill's tier, per Guardrails; otherwise hand off with run /design-feature <slug> and stop here) rather than stamping designed on a hollow closure.

6. Size it. Estimate XS / S / M / L (scale defined in the SPEC template) and record it in the SPEC. XS/S → the SPEC is the only planning artifact (single-pass execution); M/L → full artifact set. If L, propose splitting.

7. Produce the SPEC product half. Fill it and stamp ## Design status: designed once closure is complete; set the roadmap row (added at idea first if it didn't exist) to defined in the same edit — the same idea → defined transition design-feature owns, performed here when this skill is the one that satisfies closure. Then run the stage: spec readiness preflight from the internal evidence-grounding capability, mint the current artifactRevisionId, and stop: this skill never continues into the engineering half, never promotes the row past defined, and never composes plan-feature-scaffold in this turn. The plan-feature router may scaffold only after review-spec returns a current spec-review-pass receipt bound to these exact bytes.

8. Wire traceability. Record #N in the SPEC; the PR body must include Closes #N so the issue closes on merge.

9. Hand off — return exactly (fixed completion report, back to the router):

   ISSUE #<N> → SPEC <slug> — size: <XS|S|M|L>
   Verdict: feature (not bug/debt — else this would have routed to triage-issue)
   Gaps closed: <n> asked / <n> defaulted (logged)   Closure: designed | handed to design-feature
   Readiness: READY-FOR-REVIEW | NEEDS-EVIDENCE | NEEDS-DESIGN   Artifact revision: <id>
   Traceability: Closes #<N> wired
   → review-spec next (engineering planning is gated on its receipt; do not scaffold here)
   

Guardrails

• Don't silently expand scope beyond the issue — surface additions as proposals.
• Don't open the feature branch or write code here.
• Don't plan engineering work here. No Engineering half, no phases, no defined → planned promotion, no in-turn plan-feature-scaffold composition: the Product half this skill writes must be reviewed by review-spec first, and readiness READY-FOR-REVIEW is not that review.
• Keep the Closes #N link; an issue-born feature must close it.
• Never stamp ## Design status: designed with a blank Capability closure row — the same rule design-feature follows; a thin issue hands off instead of faking closure.
• Composition tier. Composing design-feature in-turn for a thin issue is allowed only when this skill is running at ≥ design-feature's tier (planning-class — strongest model / highest effort); otherwise hand off (run /design-feature <slug>) rather than under-power it.
• Otherwise honor the project's Workflow conventions (branch/PR, docs-language).

Architectural invariants

The planning preflight owns the normalized repository state read and the ONE final architectural classification for the whole plan. Consume it here before writing the product half: for each applicable invariant rule, cite its ID and repository evidence and classify the issue proposal as preserves, violates, introduces, or changes. Only preserves can be stamped designed; every other classification stops for an explicit architectural decision through the project-declared authority — never before the full plan exists, and never inferred from the issue body, SPEC, or passing test.

Relationship to other skills

• triage-issue — decides bug vs feature vs defer; call it if unsure.
• plan-fix — the fix-side sibling for bug/debt issues.
• design-feature — receives thin issues this skill cannot safely close capability closure for; both write the SPEC's product half in the same format.
• review-spec — the mandatory next hop for every issue-derived feature: it reviews and receipts the Product half this skill produced.
• plan-feature-scaffold — fills the engineering half later, only once review-spec passed. This skill never invokes it.
• execute-phase — executes the phases; its PR carries Closes #N.

Done when

• A filled SPEC product half exists, roadmap-registered at defined, with the stage: spec readiness block printed and the current artifactRevisionId recorded.
• Capability closure is satisfied (or the issue was handed off to design-feature instead of faking it) and ## Design status is accurate.
• The roadmap row status is defined (added at idea first if new) whenever ## Design status: designed was stamped — never defined on a hollow closure, never left at idea once designed is stamped.
• Nothing was scaffolded: no Engineering half, no phases, no planned write, and the fixed report hands off to /review-spec.
• #N is recorded and the PR plan includes Closes #N.
• Scope gaps were resolved with the user, not assumed.