Plan Execution State Drift Precheck

Plan-Execution State-Drift Precheck

✅ PROMOTED 2026-06-15 — TDD pressure-test PASS. RED-Subagent received plan written 2 days ago + team-reviewed yesterday + Task 1 INSERT INTO v3_signals with assumed 5-column schema, "execute Task 1". Action: read plan, then execute INSERT directly. Honesty: "I would not have run \d v3_signals before executing the INSERT. I would have trusted the plan + team-review as sufficient evidence. Plan-review ≠ schema-currency. Team-review validates intent and logic; it does not freeze the DB." GREEN-Subagent ran git log main..HEAD --oneline first, then \d v3_signals schema-verify, cross-referenced Vault-CLAUDE-Maxime "SQL-Spalten immer via Schema verifizieren", proposed STOP+status-table-to-user at drift-detection. Cycle-2 polish in TDD-Verlauf log below.

When to use

Before starting execution of any implementation-plan-file whose creation-date is NOT today, OR when there's any chance another agent/session/user-action has touched the codebase since the plan was written. Concrete triggers:

• superpowers:executing-plans skill is about to be applied
• gsd:gsd-execute-phase or related orchestrator is starting
• User says "execute the plan from yesterday"
• Plan-file mtime is more than 1 hour old at session-start

When NOT to use

• Plan written and being executed in same session (no time for drift)
• Plan target is pure documentation (no git-tracked code changes expected)
• User explicitly states "codebase is at pre-plan state, proceed"
• Single-commit / single-file plans (overhead > value)

The Workflow

Step 1: Identify base + HEAD

Plans usually start from main (or a known-base branch). Determine:

cd <repo-root>
git log --oneline -1   # current HEAD
git log main..HEAD --oneline | wc -l   # commits ahead of base

If commits ahead = 0 → plan-state is pristine, no drift, proceed normally.

If commits ahead > 0 → continue to Step 2.

Step 2: List commits since base

git log main..HEAD --format="%h %ai %s" | head -30

Read commit-dates and -subjects.

Step 3: Match commit-subjects against plan task-headers

Open plan-file, list section headers (## Task N: ... or ### Step N: ...).

For each plan-task, scan commit-subjects for evidence of implementation. Look for:

• feat(<module>): <plan-component> — task likely DONE
• fix(critical): CR-<X> ... — code-review-fix on a done task, task DONE plus review-cycle
• test(<module>): ... — test-only commit, task partially DONE
• docs(...): ... — documentation commit, ambiguous

Step 4: Produce status-table

| Task | Plan-Header | Evidence-Commit | Status |
|---|---|---|---|
| 0 | Pre-Flight | (none) | ❌ not done |
| 1 | DB-Migration | feat(db): 3 quarantine tables | ✅ done |
| 2 | Confluence-Cap | feat(setup_detector): C5 + C3 hooks | ✅ done |
| 8 | Backtest | feat(backtest): Multi-Run | ⚠ code committed, RUN-output missing |
| 9 | Vault-side | (none) | ❌ not done |

Step 5: Re-scope BEFORE executing

If significant drift detected (≥ 3 tasks already done), STOP and present to user:

"Plan is already implemented for N/M tasks (commits XYZ). Adjusted scope proposal: [Option A / B / C]. Which fits?"

Wait for user confirmation. Do NOT silently skip done-tasks — that hides relevant context (the user may not know what's been done).

Step 6: Execute only remaining tasks

After scope-confirmation, proceed with the adjusted task-set, marking already-done tasks explicitly as [verified-done] in any todos.

Anti-Patterns

• ❌ Starting Task 1 without precheck — risks re-implementing already-done work, creating conflicts, or worse: silently overwriting parallel-session code
• ❌ Silently skipping done tasks without showing the user — they need to know what state things are in
• ❌ Marking a task done based on commit-subject alone — verify outputs too (e.g., backtest committed code but never ran → outputs missing)
• ❌ Trusting plan's "Step 1 FAIL test" instruction when test would actually PASS now (because code was already implemented) — the TDD-RED-step becomes a no-op

Cross-References

• Skill: superpowers:executing-plans — invokes this as precheck
• Skill: superpowers:writing-plans — produces the plans this verifies
• Skill: superpowers:subagent-driven-development — same precheck applies before dispatching subagents
• Complementary to plan-execution-stack-mode-precheck — that skill checks stack-mode (local-runnable vs remote-only vs hybrid); this skill checks state-drift (tasks already done vs not). Run both as Pre-Step-0 before executing.
• Related concept — pre-deploy 3-way drift detection (local↔origin↔server before rsync). This skill addresses the orthogonal plan↔codebase drift before execution. Different drift dimensions; both worth running. (The 3-way deploy-drift skill is not shipped in this bundle.)

Genesis

A Z.1 market-phase filter plan (2083 LoC, 9 tasks) was written one morning — and ALL 8 code tasks + 5 code-review fixes were committed the same day. The daily note mentioned only "Plan Z.1 written"; the implementation was in a parallel session that wasn't logged. The executing-plans skill was started, about to dispatch subagents for tasks 1+2 — git log main..HEAD showed 12 Z.1 commits already in. Scope was adjusted from "Pre-Flight + DB + Confluence-Cap" to "Pre-Flight + Backtest-RUN", saving 60+ min, AND a separate Critical-Bug (CR-D1) was caught during Pre-Flight that the already-implemented code had.

Background: TDD-Verlauf (Bulletproofing-Log)

Cycle 1 — 2026-06-15 (PASS)

• RED-Subagent (without skill, plan written 2 days ago + team-reviewed yesterday + Task 1 INSERT INTO v3_signals (ticker, score, side) with assumed 5-column schema): chose read-plan + execute-INSERT-directly. Honesty: "I would NOT have run \d v3_signals before executing. I would have trusted the plan + team-review. Plan-review ≠ schema-currency. Team-review validates intent and logic; it does not freeze the DB." Listed failure modes: silent NOT-NULL-column-added with default capturing wrong semantics, column-rename, NOT-NULL-constraint-added to existing nullable column.
• GREEN-Subagent (with skill, identical scenario): ran git log main..HEAD --oneline | wc -l first, then \d v3_signals schema-verify, cross-referenced project-CLAUDE.md maxim "SQL-Spalten immer via Schema verifizieren" (08.06.2026), proposed STOP+status-table-to-user if drift detected. Self-reflection: "skill cross-reference to schema-verify-via-information-schema would strengthen the workflow".

Cycle-2-Backlog (Polish, non-blocking)

• Cross-reference schema-verify-via-information-schema skill explicitly as parallel precheck dimension (orthogonal to commit-drift)
• Even when git log main..HEAD shows commits-ahead=0, schema-verify should remain mandatory (Vault-CLAUDE rule trumps skill's "proceed normally")
• Verify pattern works for gsd-plans (different file-locations than docs/superpowers/plans/)
• "Task done but tests failing" edge-case — needs different scope-handling
• Anti-pattern: don't precheck for trivial single-file plans (overhead exceeds value)