Improve Loop — Goal Prompt Construction

This skill is for the master CC (orchestrator). It guides construction of the goal prompt written to the file passed via --goal-file to charliebot improve (the file content becomes the live, per-iteration goal). Workers do NOT need this skill — they read improve-worker instead.

Goal Prompt Rules

When writing the --goal-file content for an improve loop:

1. Start with skills to read — first line should be Read skills: improve-worker, <domain-skill>, <infra-skill>, .... List all relevant skills explicitly. Always include improve-worker. Workers won't know which skills exist unless told.
2. Order goals by importance — list goals from most important to least important, numbered (1), (2), (3)... Workers may not reach later goals if earlier ones consume all iterations.
3. State goals, not methods — say "close the performance gap" not "try fusing kernel X with Y". Workers decide their own approach.
4. Include reference numbers — target and rough gap size, so workers can judge whether a change matters. Don't paste a precise measured baseline: the A/B protocol re-measures it every iteration, so a hard-coded number just goes stale.
5. "Zero progress is acceptable" — always include this. Prevents workers from shipping bad changes just to report something.
6. Point at existing working scripts — if a benchmark/training script already exists and works, say "base your work on <path>, do not write from scratch". Otherwise workers reinvent the wrapper and re-hit known pitfalls.
7. Keep it lean — don't re-list prior attempts; the loop already feeds each iteration's work report back, so past tries are visible there. Cut anything the worker re-derives. A shorter goal re-reads better every iteration.

Master Discipline During Loop Execution

Each judged iteration delivers one child report to the manager, and the delivery wakes the master. The report summary starts with the header [Improve loop <loop id> · iteration <i>/<total>] report_valid=<true|false>; when the iteration is invalid the header continues with [invalid: <reason>], and it always carries tip=<sha>, commits_added=<n> and report=<path> before the closing Audit per the improve-goal skill. and the iteration summary. report_valid, tip and the report path are read from that header.

The header is the wake's index, not the audit input. The audit reads the report file at the header's report path itself and checks it against the live goal: its verdict is present, the goal-declared KPI readings are present, and the work direction is consistent with the goals' priority order. The delivered summary is never the audit input.

Drift signals are report_valid=false in the header, or a failing semantic audit.

When a drift signal is present, the master may edit goal.md without waiting for the user, but only in two allowed shapes: appending constraints to a ## Steering appendix section at the end of goal.md (created on first use), or reordering the existing numbered goals. No other byte of goal.md may change; KPI numbers, acceptance lines, the iteration count, and the merge-back setting therefore sit in the immutable region by construction.

Every such edit is quoted as a full diff in the master's chat report. If the user reverts goal.md, the edit is undone and takes effect starting the next iteration.

Stopping or cancelling the loop still requires explicit user approval. Without a drift signal, no edit.

Planner / Executor Separation

For large "elephant" improvements, split planning from execution:

• Planner: Optional pre-loop delegation orchestrated by the master. Use a separate script-run task to profile the repo, identify prioritized levers by impact/headroom, and write acceptance criteria for each lever. The deliverable is plan.md, passed to the loop with --plan-file. The planner may use a different backend/model through delegate --backend <id>.
• Executor: Improve loop iterations read goal.md, optional plan.md, and previous iteration summaries. Each worker decides how to implement the current highest-priority incomplete lever, not what to tackle. Ordering comes from plan.md.
• Elephants first: Order levers by impact/headroom, not ease. Multi-iteration levers are expected and normal.
• Plan is optional: Small tasks can skip the planner and omit --plan-file, preserving the original thin-goal behavior.
• Re-steering: Both goal.md and plan.md are re-read each iteration. The user can edit either mid-loop to steer subsequent workers.

What Makes a Good Goal Prompt

1. Context — gives current state and target so workers understand where they stand
2. Prioritized goals — numbered (1)-(N) with most important first
3. Delegation of method — says what to achieve, not how
4. Analysis directive — pushes workers to measure and analyze before guessing
5. Zero-progress escape hatch — lets workers report "tried X, didn't work" without feeling forced to ship bad changes
6. Skill reference — methodology lives in skills, not repeated in the prompt; keeps the goal clean

Example Structure

Read skills: improve-worker, <domain-skill-1>, <domain-skill-2>, <infra-skill>.

<Context: current metrics, target, gap size.>

Focus on:
(1) <highest priority goal — what to achieve, not how>
(2) <second priority goal>
(3) <lowest priority — cleanup, readability, etc.>

Follow the methodology in improve-worker and <domain-skill> strictly.
Zero progress is acceptable — record what was tried and metrics.