Sprint

Sprint Skill — PRD-per-Sprint Evolution

/sprint is a thin conductor, like /feature, for evolving a system PRD by PRD without regenerating its architecture from scratch each time. It grounds the new PRD against the prior sprint's requirement spine, amends the living specs/design/ baseline instead of replacing it, and gates code generation on a human-reviewable diff of the design amendment — never a regenerated document. See docs/superpowers/specs/2026-07-04-sprint-delta-lane-design.md for the full design rationale.

Use /build for sprint 1 (no existing code or specs). Use /feature for a single story or small cluster that doesn't need a full PRD. /sprint is for "here is the next PRD" — many stories, evolving an existing architecture.

Runs in the main session — do not add context: fork. Like /feature, this conductor owns interactive human gates (GATE 1, GATE 2) and delegates the actual work to forked sub-skills.

Usage

/sprint prd-sprint2.md                  # 2 gates (default)
/sprint prd-sprint2.md --autonomous     # 1 consolidated gate (folds GATE 1 into GATE 2)

There is no --auto (zero-gate) mode — GATE 2 (design-delta approval) is never collapsible, by design.

Wrong-door protection

Before anything else, check specs/design/architecture.md:

• If it does not exist and the repo has no source code (a fresh, empty project) — this is sprint 1, not sprint N. Stop and tell the human to run /build <prd> instead.
• If it does not exist but source code exists (a true brownfield app the harness did not build) — proceed to Phase 0's baseline recovery.
• If it exists — proceed normally.

/build's own Step 0 carries the mirror check: if specs/design/architecture.md already exists when /build is invoked, /build stops and redirects here.

Phase 0 — Preflight & Baseline (fully automatic, no flags)

1. Baseline recovery. If specs/design/architecture.md is missing (true brownfield): run /design --baseline-recovery (see design/SKILL.md's Baseline Recovery Mode). This runs /brownfield discovery first if specs/brownfield/code-graph.json does not exist, then derives a living design set from the graph, stamped provenance: derived-from-code, with a one-time human approval before proceeding. After this, treat the repo as if it already had an approved baseline.
2. DeepWiki freshness. If specs/brownfield/wiki/ exists, check for a > STALE since… banner; if present, patch it incrementally via /code-map --files on the flagged files, the same mechanism /feature already uses.
3. Sprint number. List specs/brd/sprint-*/ directories; the sprint number for this run is one greater than the highest found, or 2 if only the flat legacy specs/brd/brd.md exists (sprint 1 was built before sprint-numbered directories existed). State the resolved sprint number before proceeding.

Phase 1 — Requirements Delta

Run /brd --delta <prd-file> (see brd/SKILL.md's Delta Mode). This writes specs/brd/sprint-N/ and, critically, specs/brd/sprint-N/requirements-delta.json classifying every requirement as new/changed/carried against the prior sprint's spine. Any unresolved dropped entry halts here per that skill's Step Δ2 — do not proceed with a silent requirement regression.

Phase 2 — Story Decomposition

Run /spec specs/brd/sprint-N/brd.md --sprint N (see spec/SKILL.md's sprint addendum). Writes specs/stories/sprint-N/.

Reuse-or-justify — REQUIRED SUB-SKILL: reuse-or-justify when the PRD adds or materially extends behavior. Invoke reuse-or-justify at intake with the sprint's theme as the goal string and the sprint's story directory specs/stories/sprint-N/ as its batch, so intra-batch clusters across the sprint's stories surface, before GATE 1. The sub-skill grounds on reuse-scout itself: on a fire it settles reuse-vs-new (and any touched invariant / budget); otherwise it records the net-new assumption and proceeds. The decision is recorded either way — do not run reuse-scout here yourself.

GATE 1 — Approve Requirement Delta + Decomposition

Present, on one screen:

• The requirements-delta classification (new / changed / carried / dropped, with resolution for each dropped item)
• The story decomposition summary (epic table, dependency graph, story-point total) from /spec's own Step 7 output

Ask: "Does this requirement delta and story decomposition look correct? Approve to proceed to the design amendment, or provide corrections."

With --autonomous, skip this as a separate stop — fold its summary into the single GATE 2 presentation instead (do not skip the underlying /brd --delta and /spec grounding gates themselves, only the human stop).

Phase 3 — Design Delta

Run /design --delta --stories specs/stories/sprint-N/ --amendment-id sprint-N (see design/SKILL.md's Delta Mode, Steps D1–D6): read the living baseline, spawn one planner agent to write the amendment and amend the living design non-destructively, emit the grounding gate, run the contract-drift check, and run the design-delta evaluator rubric.

GATE 2 — Approve Design Amendment (never collapsible)

This is design/SKILL.md Delta Mode's Step D7, run from here. Never skipped, never folded away in any autonomy mode. On approval, the amendment and updated living-design files are committed together in one commit.

Phase 4 — Tracker Publish (optional)

If a tracker is configured (.claude/tracker-config.json), run tracker-publish --granularity group exactly as /feature's epic lane does.

Phase 5 — Delta Test Plan

Run /test (the normal flow, not --from-cr — that lane is for a single change-request bug fix with no stories directory) scoped to specs/stories/sprint-N/, so every new story gets a proper test plan and grounded verification-matrix entries exactly as a fresh spec/design pass would produce. Any existing area the amendment's Breaking Changes section names is covered by that area's own existing tests, which /auto's normal test gate re-runs — no separate regression-pin pass is needed since sprint-N stories already carry proper story-traces.json.

Phase 6 — Build

Run /auto. The merged specs/design/component-map.md (already updated by Phase 3) means the existing ownership, canvas-sync, layer, and context sensors now enforce the evolved design automatically — no /auto changes needed.

Phase 7 — Gate and PR

Run /gate, then open the PR(s) exactly as /build//feature do. Merge stays human.

State markers

At the start of Phase 0, write .claude/state/current-sprint (the resolved sprint number, e.g. 2) and update .claude/state/sprint-phase at the start of every phase (preflight, requirements-delta, story-decomposition, design-delta, tracker-publish, test-plan, build, gate) so /status can show sprint progress:

mkdir -p .claude/state
printf '%s' "N" > .claude/state/current-sprint
printf '%s' "<phase-name>" > .claude/state/sprint-phase

Gotchas

• Never let Phase 3 regenerate specs/design/ from scratch. If the planner agent's output looks like a fresh design rather than an amendment (missing prior component-map rows, a rewritten architecture.md with no trace to the prior version), stop and re-invoke Delta Mode Step D3 with a stronger instruction to read the baseline first.
• GATE 2 here is not /feature's GATE 2. They serve different lanes (PRD-scale vs single-story) but share the same underlying design/SKILL.md Delta Mode machinery — do not conflate the two conductors.
• Do not skip the requirements-delta dropped-item resolution. An unresolved dropped entry is exactly the silent regression this lane exists to prevent.
• --autonomous folds human stops, never machine gates. The grounding gates, contract-drift check, and design-delta evaluator all still run.