build
Plan-then-execute implementation against SPEC.md. Native single-thread loop, no sub-agents. On test or build failure, auto-invokes the backprop skill before retrying — a failed verification always considers whether a new §V invariant would prevent recurrence. Triggers when the user asks to build, implement, execute the spec, or tackle a specific §T task (`build §T.3`, `build --next`, `implement next task`, `run the build`). Expects SPEC.md to exist; if not, defers to the spec skill.
What this skill does
# build — implement spec Single-thread native plan→execute. You are main Claude. No swarm. ## LOAD 1. Read `SPEC.md`. If missing → tell user to invoke the spec skill first. Stop. 2. Read `FORMAT.md` once if not loaded. 3. Parse invocation args: - `§T.n` → that task only - `--next` → lowest-numbered row with status `.` or `~` - `--all` or empty → every `.` row in §T order ## PLAN Native plan mode. For chosen task(s): 1. Cite every §V invariant that applies. Plan must respect all. 2. Cite every §I interface touched. Plan must preserve shape. 3. List files to create / edit. 4. List tests to add or update (one per invariant touched). 5. Name verification command (test, build, lint). Show plan. Wait for user OK unless auto mode. ## EXECUTE Per task in order: 1. Flip §T.n status cell `.` → `~`. Just write to SPEC.md. 2. Edit code per plan. 3. Run verification command. 4. **Pass** → flip `~` → `x`. Next task. 5. **Fail** → invoke backprop skill. Do NOT retry blindly. ## FAIL → BACKPROP On test/build failure: 1. Read failure output. 2. Ask: is failure (a) my code bug, (b) spec wrong, or (c) unspecified edge case? 3. If (a) → fix code, re-run. No spec change. 4. If (b) or (c) → invoke spec skill with `bug: <cause>` first, let it update §V and §B, then resume build against updated spec. Rule: never silently fix root-cause without considering backprop. §B is the memory that stops recurrence. ## WRITE POLICY - Only flip §T status. No other SPEC.md edits from build. - Other spec edits → invoke spec skill. - Commit after each §T completes. Message: `T<n>: <goal line>` + §V cites. ## VERIFICATION Task `x` only if: - Verification command exits 0. - New test(s) added per plan. - No §V invariant regressed (run full test suite at end). ## NON-GOALS - No sub-agents. No parallel workers. Main thread only. - No progress dashboards. `cat SPEC.md | grep §T` is the dashboard. - No speculative work beyond chosen task scope.
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