build-executor

name	build-executor
description	Govern implementation from an approved execution contract. Invoke when execution-contract.md is approved and the user wants disciplined build work, TDD execution, or guarded batch-by-batch implementation.

Build Executor

Controls the implementation phase. Uses execution-contract.md as the workflow authority.

Required Inputs

Read: execution-contract.md, tasks.md, relevant specs/, relevant design.md. (Skip contract/spec requirements when workflow is tweak.)

Check workflow mode first: node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" state get <change-dir> workflow. If tweak → direct edit mode. If hotfix or full → standard contract-first discipline.

Branch/worktree preflight before ANY implementation edit (mandatory — do not skip):

1. Run the isolation check:

   node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" isolate <change-dir>
   

   This script enforces git isolation: if you are on main/master it creates a git worktree (preferred) or a new branch, and exits non-zero if it cannot and you have not approved --force.
2. If node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" isolate exits non-zero: STOP. Do not edit main/master in place. Ask the user for explicit approval (and re-run with node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" isolate <change-dir> --force only after they approve).
3. If it succeeds, report the chosen branch/worktree and make all implementation edits there.

Core Laws

Law 1: Contract First

The execution contract is the approved handoff artifact, not chat history.

Law 2: TDD Iron Law — No Production Code Without a Failing Test First

RED (write test, see it fail) → GREEN (write minimal code, see it pass) → REFACTOR (clean up, suite stays green).

Red Flags: "Quick implementation first, test later" / "Skip the test, manually verify" / "I already know it works" / "Just this one time without tests." ALL mean STOP and write the test first.

Law 3: Review Before Drift

Block on: logic defects, spec violations, missing required tests, unintended scope expansion.

Law 4: Rewind on Contract Break

Return to specifying or bridging if: new behavior appears, interfaces change materially, design assumptions fail, artifacts no longer define intended implementation.

Execution Mode Selection

For full/hotfix, SDD is the default execution mode. Generate a machine-backed plan before deciding who edits code:

node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" execution plan <change-dir> \
  --mode sdd --reason "full/hotfix default SDD" \
  --wave <wave-id>:<parallel|serial>:<task,...>[:<depends-on,...>]
node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" execution show <change-dir> --json

The optional fourth --wave segment names prerequisite wave IDs. execution show --json reports current, plus each wave's depends_on, receipt, blockers, retryable, and eligible status. A wave with retryable: true has a current fail receipt and is eligible only for its focused repair and re-review; its dependents remain blocked until its replacement pass receipt. Report the saved plan revision, selected mode, ordered waves, dependencies, and whether every parallel wave can actually be dispatched concurrently on the current platform. If concurrency is unavailable, state the capability and reason plainly; retain the planned parallel strategy and do not silently execute it as a serial or Batch Inline plan.

inline and batch-inline are available only through an explicit user override. Record that request with --override; task count, module locality, estimated effort, or execution.inlineThreshold never auto-selects either mode.

Mode	Criteria
SDD (default for full/hotfix)	Generated unless the user explicitly overrides it
Inline	Explicit user override for a small, sequential task set
Batch Inline	Explicit user override for a bounded batch; it remains serial and is never presented as parallel

Do not transition to executing until execution show reports current: true and the phase guard passes. A revised plan must use ssf execution revise; it creates a new revision and invalidates receipts from the prior revision.

Batch Inline Execution

Only when the user explicitly selects batch-inline. Current agent executes directly and serially. TDD Iron Law still applies.

Procedure: announce mode → write failing test → confirm failure → implement → run suite → refactor → lightweight checkpoint (files exist, no placeholders, test passed, no unintended changes) → report.

Boundaries: if any task touches >1 module, involves schema/API/config changes, or has open questions → downgrade to Inline or SDD.

SDD Workflow

For full/hotfix by default. Dispatch according to the persisted plan, review each planned wave, and run a final broad review after all waves.

Planned-Wave Loop

1. Read the current plan with ssf execution show <change-dir> --json; only waves shown with current: true and eligible: true may start. A retryable: true wave may only be repaired and re-reviewed; do not dispatch its dependents until its replacement receipt is pass. The CLI encodes dependencies in --wave <id>:<strategy>:<tasks>[:<depends-on,...>] and rejects a review receipt for a wave whose prerequisites lack current pass receipts.
2. A parallel wave may dispatch independent tasks simultaneously only when the platform supports concurrent dispatch. If it does not, disclose the unavailable capability and execute the same wave one task at a time without changing its stored strategy.
3. A serial wave dispatches one task at a time in listed order.
4. After every wave, write a non-empty persisted regular-file review report (separate from the implementer's report), then record exactly one receipt that names that review report:

   node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" execution review <change-dir> \
     --wave <wave-id> --base <sha> --head <sha> --report <review-report-path> --verdict <pass|fail>
   

   Do not begin a dependent wave until its predecessor receipt is pass.
5. Critical/Important findings require a fail receipt, a focused repair, re-review, then a replacement pass receipt. Never advance or close with a missing or failed receipt.

Per-Task Loop

1. Dispatch implementer: Use ${CLAUDE_PLUGIN_ROOT}/skills/build-executor/implementer-prompt.md template. Extract task brief with scripts/task-brief PLAN_FILE N. Include: where task fits, brief path, interfaces from prior tasks, report file path.
2. Handle response: DONE → generate review package + dispatch reviewer. DONE_WITH_CONCERNS → assess. NEEDS_CONTEXT → provide context. BLOCKED → re-dispatch with better model or escalate.
3. Review: Use skills/build-executor/task-reviewer-prompt.md. Reviewer returns spec compliance + code quality verdicts with the wave ID, git range, report path, and pass/fail receipt command.
4. Fix: If Critical or Important issues, write the fail receipt, dispatch fix subagent, re-review, and write the replacement pass receipt.
5. Mark complete: Append to .superpowers/sdd/progress.md: Task N: complete (commits <base7>..<head7>, review clean)

Model Selection

Use the configured profile that matches the task role. Resolve it before dispatch:

node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" config --resolve-model <profile>

Profile	Role
mechanical	Cheap, routine edits
standard	Integration and judgment work
strong	Architecture, design, and final review
review	Review that matches the diff

For platforms whose dispatch supports a model field, explicitly pass the resolved model value. If the result is configured: false, automatic selection is unavailable: do not invent a provider model and do not bypass the existing requirement to specify model explicitly. Resolution only reads configuration; it does not switch models.

Progress Ledger

Track in .superpowers/sdd/progress.md. Check for existing ledger — completed tasks are done. After each batch: node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" state set <change-dir> batches_completed <N>.

Inline Execution Mode

Only after an explicit user override recorded by ssf execution plan --override. Executes in the current session and still writes one review receipt per planned wave.

Per-task: extract brief → write failing test → confirm failure → implement → confirm green → checkpoint review (done-when criteria, SHALL/MUST verification) → commit → save a task-level recovery checkpoint when another task remains → append to progress ledger.

After a task is committed and reviewed, when another task remains, save the recovery context with real evidence:

node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" checkpoint save <change-dir> \
  --task <completed-task-id> --next "<next task>" --completed "<completed work>" \
  --verification "<verification report path>" --review "<review report path>" \
  --risk "<open risk or None>" --commit-start <base-sha> --commit-end <head-sha>

This augments .superpowers/sdd/progress.md; it does not replace the progress ledger or add a new core workflow state. Do not claim a checkpoint is current when ssf checkpoint list reports it as stale.

If task hits BLOCKED (3+ fix failures or changes outside declared scope), escalate to SDD.

Tweak Mode

Skip TDD. Apply changes directly. Verify file integrity (exists, non-empty, valid syntax). No batch execution — sequential changes.

DP Records

DP-4 is written by ssf execution plan; do not write it with raw state set. DP-5 (debug escalation): node "${CLAUDE_PLUGIN_ROOT}/scripts/spec-superflow.mjs" state set <change-dir> dp_5_result "<resolution>" + timestamp.

Completion Standard

Don't report completion until: tests pass, contract obligations satisfied, review blockers resolved, every planned wave has a current pass receipt, final review is complete, and workflow is ready for release-archivist.

Exception Handling

• Parse failures: Stop and report exact line/format issue. Route back to contract-builder.
• Missing artifacts: Route back to appropriate upstream skill. Don't guess.
• User interruption: Progress ledger enables recovery. Check ledger on resume.