/feature-coordinate "<feature-slug>"

Parallel batch coordinator. Launches independent work units as parallel subagents, waits for completion, then launches the next batch. Only used when execution_strategy is balanced or speed.

Subagent contract — MANDATORY for every dispatch

Every Agent dispatch this skill issues (test-writer, code-writer, refactor, adversarial, PR draft, or any other subagent) MUST include this preamble at the top of its prompt:

Subagent contract: Honor rules/completeness-contract.md (load-bearing — no silent deferrals; trigger phrases = escalation signals, not completion modes). If you cannot complete assigned scope, escalate via AskUserQuestion with user-validatable proof. A return claiming COMPLETE alongside deferred items is a contract violation.

When work-unit subagents return, the coordinator MUST run the validation script BEFORE marking the unit complete:

mkdir -p /tmp/vallorcine
return_file=/tmp/vallorcine/coord-return-"<slug>"-"<unit-id>".txt
printf '%s\n' "$FULL_RETURN_TEXT" > "$return_file"
bash .claude/scripts/validate-subagent-return.sh "$return_file" --require-ac-coverage 2>/tmp/vallorcine/validator-stderr.txt
rc=$?

• rc=0 → proceed with unit COMPLETE.
• rc=1 → trigger phrase detected. Block COMPLETE for that unit and surface to user via AskUserQuestion with the validator's stderr as context. Do not advance to the next batch until the user resolves.
• rc=2 → tooling error. Log and treat as rc=0.

Step 0 — Pre-flight

Read .feature/<slug>/status.md.

• Nested-dispatch guard (CRITICAL — refuse to run inside a dispatched sub-agent). If status.md contains nested_in_dispatch: true, this skill was invoked inside a /work-start --nested / /work-run dispatched sub-agent. The dispatched-sub-agent context cannot itself issue Agent tool calls, so this skill's work-unit parallel batches would fail at runtime. The orchestrator already provides parallelism at the WD level. Refuse to run:

  🔀 COORDINATOR · <slug>
  ───────────────────────────────────────────────
  ERROR: This feature was dispatched as a sub-agent of /work-start or
  /work-run (status.md has nested_in_dispatch: true). /feature-coordinate
  cannot run inside a dispatched sub-agent — nested Agent tool calls are
  not supported, and the orchestrator is already providing parallelism
  at the WD level.
  
  /feature-plan should have forced execution_strategy: cost on this
  feature before reaching this skill. If you're seeing this error, the
  upstream /feature-plan invocation didn't honor nested_in_dispatch.
  Inspect status.md and update execution_strategy to cost manually,
  then run /feature-test "<slug>" --unit WU-1 to start sequential
  work-unit execution.
  ───────────────────────────────────────────────

  Stop with exit 1.
• Verify execution_strategy is balanced or speed. If it is cost or not-set:

  🔀 COORDINATOR · <slug>
  ───────────────────────────────────────────────
  Execution strategy is '<strategy>' — parallel coordination not applicable.
  Use /feature-test "<slug>" to start sequential execution.

  Stop.
• Read automation_mode from status.md.

Display opening header:

───────────────────────────────────────────────
🔀 COORDINATOR · <slug>
───────────────────────────────────────────────

Step 0a — Progress tracking

Use TodoWrite to show progress in the Claude Code UI (visible via Ctrl+T). Each TodoWrite call replaces the full list — always include all items.

The coordinator owns TodoWrite in parallel mode. Subagents launched by the coordinator MUST NOT call TodoWrite — their writes would overwrite the coordinator's checklist since only one list exists at a time.

Build the checklist dynamically from the Work Units table. Include pipeline context and one item per work unit. Use activeForm to show which stage each active unit is in.

Example for 3 units mid-batch:

[
  {"id": "pipeline-scoping", "content": "Scoping", "status": "completed", "priority": "medium"},
  {"id": "pipeline-domains", "content": "Domain analysis", "status": "completed", "priority": "medium"},
  {"id": "pipeline-planning", "content": "Work planning", "status": "completed", "priority": "medium"},
  {"id": "pipeline-parallel", "content": "Parallel execution", "status": "in_progress", "priority": "high",
   "activeForm": "Batch 1 — 2 units running"},
  {"id": "pipeline-pr", "content": "PR draft", "status": "pending", "priority": "medium"},
  {"id": "wu-1", "content": "WU-1: Auth types", "status": "in_progress", "priority": "high",
   "activeForm": "implementing — 4/6 tests passing"},
  {"id": "wu-2", "content": "WU-2: Token store", "status": "in_progress", "priority": "high",
   "activeForm": "writing tests"},
  {"id": "wu-3", "content": "WU-3: Middleware", "status": "pending", "priority": "high"},
  {"id": "merge", "content": "Merge logs and integration tests", "status": "pending", "priority": "medium"}
]

Update unit items to completed as each subagent returns. The coordinator can update activeForm on in-progress units based on their per-unit status.md between batches.

Step 1 — Build dependency graph and display execution plan

Read the Work Units table from status.md. Build the full dependency graph.

If all units are complete: skip to Step 4 (merge + finalize).

Compute the critical path — the longest chain of dependent units. This determines the minimum wall-clock time regardless of parallelism.

Display the execution plan:

── Execution plan ─────────────────────────────
Dependency graph:
  WU-1 ──┐
          ├── WU-3 ── WU-5
  WU-2 ──┘
  WU-4 (independent)

Critical path: WU-1 → WU-3 → WU-5 (3 sequential stages)
Max parallelism: 3 units (WU-1 + WU-2 + WU-4)

Ready now:
  → WU-1: <name>
  → WU-2: <name>
  → WU-4: <name>

Waiting:
  ○ WU-3: <name> (needs WU-1, WU-2)
  ○ WU-5: <name> (needs WU-3)

Previously completed:
  ✓ <any completed units>

In speed mode: launch all ready units immediately — no batch grouping. As each unit completes, check if new units are unblocked and launch them in the same cycle. Units start as soon as their dependencies resolve, not when an entire batch finishes.

In balanced mode: group ready units into batches as before, wait for the full batch, then launch the next. This is simpler and uses fewer parallel sub-agents.

Step 1a — Subagent dispatch contract

Every Agent call the coordinator issues to run a work unit MUST include the following termination contract in the prompt. The pipeline skills (/feature-test, /feature-implement, /feature-refactor) already mode-gate their AskUserQuestion sites against execution_strategy: balanced | speed, so subagents will chain autonomously between stages. The contract below closes the remaining hang vector: subagents that finish their work but keep taking actions instead of returning.

Hang root-cause (2026-04-23): WU-3 wrote status.md = COMPLETE and all tests green, then the subagent continued running ~2 min with no further meaningful work before the user had to Ctrl+C to unblock the coordinator. The Agent tool blocks the parent until the child emits its final assistant message; there is no timeout, no polling, no "you're clearly done" signal.

Required prompt fragments

Include these verbatim (or paraphrased keeping the semantics) in every subagent prompt:

## Termination contract (MANDATORY)

The Agent tool call that launched you returns to the coordinator only when
you emit your final assistant message. The coordinator has no timeout and
cannot poll you.

You MUST return to the coordinator IMMEDIATELY after:
- writing units/WU-<n>/status.md with Substage = `complete`, OR
- writing an escalation entry to cycle-log.md and setting substage to
  `escalated-<reason>`.

Your final message MUST be the single-line summary below — nothing else.
Do NOT run any more tools, re-verify, re-read cycle-log.md, or polish.
If you catch yourself about to call another tool after marking complete,
STOP and emit the summary instead.

## Return format (exactly one line)

WU-<n>: <COMPLETE | ESCALATED | STOPPED_AT_<stage> | ERROR> — <n tests>, <n constructs>, <brief detail>

Automation mode

Every dispatched subagent prompt must explicitly set the expectation:

Treat automation_mode as autonomous. Do NOT pause between pipeline stages.
All AskUserQuestion sites in /feature-test, /feature-implement,
/feature-refactor are mode-gated against execution_strategy = balanced/speed
— you will not encounter an interactive prompt. If a pipeline skill would
still try to open AskUserQuestion (new site added without gating), treat
that as a bug: record it to cycle-log.md and return ESCALATED.

KB tendency-scan contract (MANDATORY)

Rich per-unit dispatch prompts describe the work concretely (spec requirements, construct contracts, test expectations). A side-effect is that cross-cutting pipeline steps buried inside /feature-implement and /feature-test never surface into the subagent's attention — the subagent runs the dispatch prompt faithfully and skips the skill's numbered steps it was nominally told to invoke.

Empirical gap (2026-04-24): across a 4-WU parallel run, 0 of 4 subagents consulted .kb/ during implementation. The Step 8 tendency scan in /feature-implement and the Lens B scan in /feature-test did not fire on any unit. Audit subsequently produced findings for patterns already in .kb/ as adversarial-finding entries.

Include the following verbatim (or paraphrased keeping the semantics) in every subagent prompt that invokes /feature-implement or /feature-test:

## KB tendency-scan contract (MANDATORY)

After each construct's tests pass in `/feature-implement` Step 8 — and for
each new test class in `/feature-test` Lens B — you MUST run:

  bash .claude/scripts/kb-search.sh "<domain> <construct-type>" --kb-root .kb --top 5

For each result with `type: adversarial-finding`:
  - Read the entry's `applies_to` patterns and `## Test guidance`
  - Check your just-implemented code (or tests) against the pattern
  - If matched: fix proactively and re-run tests (implementation), or add
    a targeted test method (tests)
  - If not applicable: record why in a one-line note

After each scan, write the substage checkpoint to units/WU-<n>/status.md:
  Substage: tendency-scan-complete: <n> patterns checked, <n> applied

Append one line to units/WU-<n>/cycle-log.md:
  tendency-scan (<construct>): <n> results / <n> applied / <n> skipped

Budget: <30 seconds per construct, ≤5 KB entries deep-read. The scan
prevents re-introducing patterns already known to `.kb/`. Skipping it is a
silent correctness loss, not a performance win — audit will rediscover the
same patterns at higher cost.

Coordinator-side verification

After each subagent returns, in addition to checking status.md for complete vs escalation substage, the coordinator should sanity-check:

• Status.md Stage/Substage matches the summary line verb (COMPLETE → complete; ESCALATED → escalated-<reason>).
• If they disagree, trust status.md — the canonical state is on disk.
• Grep units/WU-<n>/cycle-log.md for tendency-scan ( entries. A COMPLETE unit with zero tendency-scan entries AND a non-empty .kb/ is a contract violation — the KB scan contract was dispatched but the subagent skipped it. Record this to the feature-level cycle-log.md: tendency-scan-missing: WU-<n> — <n constructs>, KB present. Do not escalate; surface this in the Step 4e token summary so the user knows KB leverage was lost for that unit.

Step 2 — Launch and monitor (speed mode)

The coordinator runs a completion-driven loop instead of batch-wait:

1. Launch all currently ready units as parallel sub-agents (invoke /feature-test "<slug>" --unit WU-<n> for each). All invocations in a single response — Claude Code runs them in parallel.
2. Monitor — as each sub-agent returns: a. Verify working directory — run pwd and confirm it is the project root (not a .claude/worktrees/ path). If in a worktree path, cd back to the project root before any file operations. This prevents phantom "file not found" errors after subagent completion. b. Read its units/WU-N/status.md to check the result. c. If refactor complete → mark complete in the feature-level Work Units table. d. If escalation → handle immediately (see escalation handling below). e. Check for newly unblocked units — scan the Work Units table for any unit whose dependencies are now all complete and status is not-started. f. If new units are ready → launch them immediately as sub-agents. Display: → WU-<n>: <name> (unblocked by WU-<completed>)
3. Repeat until all units are complete or blocked by escalations.

This means a unit deep in the dependency chain starts as soon as its last dependency finishes — it doesn't wait for unrelated units in an earlier "batch" to complete. For a graph like:

WU-1 (fast, 2 constructs) ──→ WU-3 ──→ WU-5
WU-2 (slow, 6 constructs) ──↗
WU-4 (independent)

Batch mode would run: {WU-1, WU-2, WU-4} → wait for all → {WU-3} → {WU-5}. Speed mode runs: {WU-1, WU-2, WU-4} → WU-1 finishes → can't start WU-3 yet (needs WU-2) → WU-4 finishes → WU-2 finishes → immediately start WU-3 → WU-3 finishes → immediately start WU-5. If WU-3 only depended on WU-1, it would start as soon as WU-1 finishes without waiting for WU-2.

While sub-agents are running: update the TodoWrite checklist with each unit's latest state by reading per-unit status.md:

"activeForm": "<stage> — <substage>"

Examples:

• "testing — writing tests (3 of 5)"
• "implementing — 4/6 tests passing"
• "refactor — 2c security"

Step 2b — Launch and monitor (balanced mode)

Balanced mode uses the simpler batch approach:

1. Compute batch — find all units where status is not-started AND all dependencies are complete. Group as the current batch.
2. Launch all batch units as parallel sub-agents.
3. Wait for all sub-agents in the batch to return.
4. Verify working directory — same as speed mode Step 2.2a. Always confirm pwd is the project root after subagents complete.
5. Check results — mark completed units, handle escalations.
6. Loop — go back to step 1 for the next batch.

This is the same behaviour as before — predictable batch boundaries with clear checkpoints between batches.

Step 2c — Stall detection

Subagents can hang silently with no output or progress. The coordinator cannot set hard timeouts (Claude Code does not expose this), but it should surface staleness to the user.

Between sub-agent checks: if a sub-agent has been running with no status.md update for an extended period, note this in the TodoWrite checklist:

"activeForm": "running — no status update in >10m ⚠️"

If the user reports a stall or asks about progress: check the unit's status.md for the last substage update. If the substage has not changed, advise the user:

── Possible stall ────────────────────────────
  WU-<n>: last status update was <substage> at <time>

Options:
  wait   — continue waiting (may resolve on its own)
  kill   — cancel the subagent and retry this unit
  skip   — mark unit as failed, block dependents

This is advisory — the coordinator cannot kill subagents directly. The user must cancel manually if needed. The coordinator can then retry the unit.

Step 3 — Escalation handling

When any unit hits an escalation (from sub-agent return or status.md check):

── Escalation ────────────────────────────────
  WU-<n>: <escalation details from unit status>

How would you like to proceed?
  retry  — re-run the failed unit
  skip   — mark as failed, continue with dependent units blocked
  stop   — pause for manual intervention

Wait for user input. In speed mode, other running sub-agents continue while waiting — the escalation only blocks the failed unit and its dependents.

Step 3b — Completion display

When all units are complete (or between batches in balanced mode):

── Progress ──────────────────────────────────
  ✓ WU-<n>: <name> — <n> tests, <n> constructs
  ✓ WU-<n>: <name> — <n> tests, <n> constructs
  → WU-<n>: <name> — in progress
  ○ WU-<n>: <name> — waiting on <deps>

• If automation_mode: autonomous and units remain: continue the loop.

• If automation_mode: manual and units remain:

  More units ready.

  Use AskUserQuestion with two options:

  • "Continue" (description: process next ready units)
  • "Stop" (description: display resume command and stop)

  If "Continue": continue. If "Stop": display resume command and stop.

Step 4 — Merge and finalize

All work units are complete.

4a — Merge cycle logs

Read each units/WU-N/cycle-log.md. Merge into feature-level cycle-log.md:

• Interleave entries by timestamp
• Prefix each entry header with [WU-N]
• Example: ## <YYYY-MM-DD> — [WU-2] tests-written

4b — Post-coordination verification

Before running integration tests, verify the final state is clean. This catches worktree confusion, silent failures, or partial writes from subagents.

1. Verify working directory — confirm pwd is the project root.
2. Verify all expected files exist — for each work unit, read the unit's work-plan.md section and check that every file listed in its constructs exists on disk. Collect any missing files.
3. Run the full test suite (5-minute Bash timeout) — not per-unit tests, the complete suite from the project root (read test command from project-config.md). If the suite hangs, investigate before retrying. This catches cross-unit regressions that per-unit tests wouldn't see.

4. Report results:

   ── Verification ──────────────────────────────
     Files: <n>/<n> present ✓
     Tests: <n> passing ✓

   If any files are missing or tests fail:

   ── Verification ──────────────────────────────
     Files: <n>/<total> present
       MISSING: <path> (WU-<n>)
       MISSING: <path> (WU-<n>)
     Tests: <n> failing
   
   How would you like to proceed?
     retry <WU-n>  — re-run a specific work unit
     continue      — proceed despite issues
     stop          — pause for manual investigation

   Wait for user input before continuing.

4c — Run integration tests

Run integration tests (equivalent to refactor Step 2f). In parallel mode, integration tests are deferred from individual refactor stages to here.

Read project-config.md for the Run integration tests command.

If an integration test command is configured:

Run it. Three possible outcomes:

1. All pass — note the result and continue.

   Integration tests: <n> passing ✓

2. Some fail — determine whether the failure is related to this feature:
   • If YES: treat as a bug. Fix, re-run unit tests, re-run integration tests. Append integration-test-failure to cycle-log.md.
   • If NO: note as pre-existing. Append integration-test-warning to cycle-log.md. Continue.
3. Cannot run — note and continue.

If no integration test command is configured: check for integration test directories. If found, note for manual check. If not found, skip silently.

4d — Update feature-level status

Update feature-level status.md:

• All units marked complete in Work Units table
• Stage → refactor, substage → refactor complete

4e — Hand off

Read the Stage Completion table from status.md and display a token summary:

───────────────────────────────────────────────
🔀 COORDINATOR complete · <slug>
───────────────────────────────────────────────
All <n> work units complete.
Integration tests: <result>
Merged cycle log: .feature/<slug>/cycle-log.md

── Token Summary ──────────────────────────────
  | Stage          | Est.   | Actual           | Δ      |
  |----------------|--------|------------------|--------|
  | Scoping        | ~5K    | 4.2K in / 3K out | -16%   |
  | Domains        | ~6K    | 8.1K in / 2K out | +35%   |
  | Planning       | ~8K    | 7.5K in / 5K out | -6%    |
  | Testing        | ~5K    | 6.0K in / 4K out | +20%   |
  | Implementation | ~8K    | 9.2K in / 7K out | +15%   |
  | Refactor       | ~6K    | 5.8K in / 3K out | -3%    |
  |----------------|--------|------------------|--------|
  | Total          | ~38K   | 40.8K in / 24K out       |
───────────────────────────────────────────────

• If automation_mode: autonomous: invoke /feature-pr "<slug>" immediately.

• If automation_mode: manual:

  Feature is ready for PR.

  Use AskUserQuestion with two options:

  • "Create PR" (description: invoke /feature-pr)
  • "Stop" (description: display resume command)

  If "Create PR": invoke /feature-pr "<slug>". If "Stop": display Next: /feature-pr "<slug>" and stop.

Write authority

The coordinator writes to:

• .feature/<slug>/status.md — Work Units table (unit status), batch tracking comments
• .feature/<slug>/cycle-log.md — merged log from per-unit logs

The coordinator does NOT write to per-unit files (units/WU-N/). Those are owned by the TDD subagents.