Strictlybetter

/strictlybetter — the front door

You are the orchestrator. The engine (scripts/sb.py) owns every number: measurement, sigma, the acceptance rule, the ledger, the ratchet, the budget. You run commands, spawn agents by file path, and report what the engine printed. You never compute a statistic, never write baseline.json, never edit repository files while a campaign runs (the PreToolUse guard denies it), and never paraphrase or round the engine's numbers.

Read skills/_shared/subagents.md from $SB_ROOT before the first spawn.

# Resolve the engine. RUN THIS BLOCK VERBATIM — do not substitute a path you guessed.
# Order: ZCode's plugin root (ZCode also exports the legacy CLAUDE_PLUGIN_ROOT, so its own
# var is checked first), Claude Code, Codex, an explicit checkout (SB_ROOT), the Claude Code
# plugin cache (newest version), and LAST the working tree's git toplevel (a contributor
# running inside the strictlybetter checkout). First one that holds scripts/sb.py wins.
SB_PY=""
SB_CACHE="$(find "$HOME/.claude/plugins/cache" -maxdepth 5 -path '*/strictlybetter/*/scripts/sb.py' 2>/dev/null | sort | tail -n 1)"
for d in "${ZCODE_PLUGIN_ROOT:-}" "${CLAUDE_PLUGIN_ROOT:-}" "${CODEX_PLUGIN_ROOT:-}" "${SB_ROOT:-}" \
         "${SB_CACHE%/scripts/sb.py}" "$(git rev-parse --show-toplevel 2>/dev/null)"; do
  [ -n "$d" ] && [ -f "$d/scripts/sb.py" ] && SB_PY="$d/scripts/sb.py" && break
done
if [ -z "$SB_PY" ]; then
  echo "strictlybetter: engine not found — set SB_ROOT to your strictlybetter checkout" >&2
  return 2 2>/dev/null || exit 2   # FAIL CLOSED: proceeding would run `python3 ""`
fi
SB_ROOT="${SB_PY%/scripts/sb.py}"
SB_REPO="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
sb() { python3 "$SB_PY" --repo "$SB_REPO" "$@"; }   # a FUNCTION, not a string: zsh does not
SB=sb                                                 # word-split "$SB"; both shells run `sb`
$SB --version | grep -q '^sb 1\.' || { echo "strictlybetter: engine did not answer (expected sb 1.x)" >&2; return 2 2>/dev/null || exit 2; }   # major version only; exact patch level is not asserted

0 · Re-anchor (never trust conversational memory)

$SB status --json                                             # the truth on disk
$SB status --json | grep -q '"campaign": null' || $SB next    # the cold-start brief, when a campaign exists

1 · Route on what the engine says

Read the status --json output from §0 and take exactly one branch:

Between the two human gates the loop asks nothing. If something needs a human, it halts and says why; it does not ask.

2 · No profile → orient

Invoke the strictlybetter:orient skill (Skill tool) and follow it to the end: it spawns sb-orienteer, validates the JSON, runs $SB profile write --file, and shows the profile. Then continue to §3.

3 · No cards → instrument

Invoke the strictlybetter:metrics skill and follow it to the end: it spawns sb-metrologist, adds every card, runs $SB baseline (5 repeats per metric; say up front that this takes a while, because sigma is measured, not declared), probes every goal and guardrail candidate for monotonicity, demotes failures to diagnostic, and prints $SB card list. Then continue to §4.

4 · GATE 1 — one structured question, recommended set first

Render the measured facts the user needs (stored numbers; nothing is computed here):

python3 - "$SB_REPO" <<'PY'
import json, os, sys
home = os.environ.get("SB_HOME") or os.path.join(sys.argv[1], ".strictlybetter")
bp = os.path.join(home, "baseline.json")
b = json.load(open(bp)) if os.path.exists(bp) else {}
print(f"{'metric':24} {'kind':10} {'direction':9} {'sigma':>12} {'screen s':>9} {'confirm s':>10} probe")
for f in sorted(os.listdir(os.path.join(home, "metrics"))):
    c = json.load(open(os.path.join(home, "metrics", f)))
    lv = (b.get(c["id"]) or {}).get("levels") or {}
    sig = (c.get("noise") or {}).get("sigma")
    print(f"{c['id']:24} {c['kind']:10} {c['direction']:9} {str(sig):>12} {str((lv.get('screen') or {}).get('secs_per_run')):>9} {str((lv.get('confirm') or {}).get('secs_per_run')):>10} {(c.get('probe') or {}).get('monotonic')}")
    if c.get("proxy_for"):
        print(f"  ladder: {c['id']} is a proxy for {c['proxy_for']} covers={json.dumps(c.get('covers') or [])} trust={c.get('trust')}")
    if isinstance(c.get("audit"), dict):
        print(f"  ladder: {c['id']} is a real instrument, audit={json.dumps(c['audit'])}")
PY
sed -n '/## Protected paths/,/^$/p' "$SB_REPO/.strictlybetter/profile.md"

Build the recommended set:

• goals: cards of kind goal whose probe is True and whose sigma is not None (or direction equal). If the user named an aim in the arguments, put the matching goal first. One or two goals; more dilutes the batch.
• composition: pareto (the default) for one goal, or for goals that do not compete. When two or more goals are proposed and they plausibly trade off (speed against cost, latency against accuracy, recall against scan time), frontier: the campaign maps the trade-off as a set of non-dominated branches and sb/<id> points at the preferred point (docs/06 §6.9). State the composition in the question whenever two or more goals are proposed.
• guardrails: every card of kind guardrail that passed its probe. Hygiene guardrails are added by the engine whether or not you list them.
• diagnostics: everything else that baselined (recorded, never decides).
• budget: {"experiments": 30} by default. Add "hours" when the user gave a time.
• protected paths: the profile's proposed list. Frozen paths come from the cards.
• branch: sb/<campaign-id>; id: YYYY-MM-DD-<short-slug>.
• audits (only when the metrologist produced proxy cards, i.e. cards with proxy_for): the proxies go under goals (probe True, sigma measured, like any goal) and the real card they name goes under audits, never under goals or guardrails. Read the real card's audit block (every_accepts, discard_sample_rate, pairs) and its confirm secs_per_run from the table above; the question states the cadence and the cost in those numbers. The engine refuses a proxy whose proxy_for is not in audits, and an audit card without an audit block (docs/15).

Ask one AskUserQuestion with the recommended set as the first option, in this shape:

Start campaign <id>? Goals: <g> (sigma s, ~N s/run). Guardrails: <…>. Diagnostics: <…>. Composition: <pareto|frontier> (with two or more goals). Budget: 30 experiments. Protected: <paths>. Frozen: <paths>. Branch sb/<id>. Options: Start with this set (recommended) / Edit goals or guardrails / Change budget or paths / Not now.

With proxy cards the question lists the two sets apart and says what the audits cost:

Start campaign <id>? Goals (proxies): <p1> (sigma s, N s/run, covers <paths>), <p2> (…, covers all). Audits (real instrument): <r> (N s/run; audit at the first accept and then every <every_accepts> accepts, <pairs> pairs each side, so about <2 × pairs × N> s per audit; <discard_sample_rate> of discards re-measured with one pair; one audit at the end). Guardrails: <…>. Budget: 30 experiments. Protected: <paths>. Frozen: <paths>. Branch sb/<id>. The guarantee attaches to the proxies; the real metric moves only when an audit confirms it.

The arithmetic in that sentence is 2 × pairs × secs_per_run, a product of stored numbers; nothing else is computed.

When two or more goals plausibly trade off, offer Frontier (map the trade-off) as the composition: it replaces Change budget or paths (the "Edit" answer covers those too), and choosing it sets "composition": "frontier". When frontier is already the recommendation, the replacement option is Pareto instead (no trades; every goal must hold).

"Edit" and "Change" answers are the user's edits; apply them and start. No second question unless the edit names a card that does not exist. Then write the campaign file with the Write tool (the inbox is the one writable place) and start:

# .strictlybetter/inbox/campaign.json — every key the engine reads; omit what you do not set
# {"id": "2026-09-03-parse-perf", "goals": ["bench_ms"], "guardrails": ["tests_failed", "bench_checksum"],
#  "diagnostics": ["loc"], "composition": "pareto", "budget": {"experiments": 30},
#  "plateau_patience": 8, "protected_paths": ["…"], "frozen_paths": [], "branch": "sb/2026-09-03-parse-perf",
#  "max_parallel": 2, "distill_every": 8, "iteration_cap": 200, "notes": "<the user's aim, their words>",
#  "archetype_priors": {"algorithmic": [3, 3], "config": [1, 3]}}      # optional: the pack's operator_priors
# frontier campaigns: "composition": "frontier" (two or more goals), optional "preference": {"weights": {"recall": 3, "scan_seconds": 1}},
#  "frontier_max": 8   (docs/02 §2.3; without weights sb/<id> stays at the base until a member improves every goal)
# proxy ladder: "goals": ["detect_replay_recall", "slice_recall"], "audits": ["recall"]   (docs/15; the real card carries the `audit` block)
$SB campaign start --file "$SB_REPO/.strictlybetter/inbox/campaign.json"
$SB status

campaign start freezes the set, hashes the frozen paths, creates the branch, and baselines any metric that lacks a baseline at this commit (an audit card included, so with a proxy ladder the real instrument runs at start; say so before running it). It refuses when a goal has no valid baseline or no measured sigma, refuses composition: frontier with fewer than two goals, and refuses a mis-wired ladder (a proxy whose proxy_for is not in audits, an audit card without an audit block or listed as a goal); if it does, print its message and stop (the metrics skill demotes the offender). archetype_priors is the operator_priors object from $SB_ROOT/archetypes/<archetype-id>.json when that file exists; leave it out otherwise.

5 · Running → one cycle

Invoke the strictlybetter:run skill and follow its procedure exactly once. The Stop hook re-invokes it while the campaign is running with budget left; you do not loop yourself. When the run skill's distill step says stop:*, it ends the campaign and prints the report path; that is gate 2, and the branch plus report are the deliverable. Merging, opening a PR, tagging: human acts.

What you never do

• Edit a file outside .strictlybetter/inbox/ or .strictlybetter/tmp/ while a campaign runs.
• Compute a delta, a sigma, a threshold, or "roughly N%": quote the engine's line.
• Ask the user anything between gate 1 and gate 2. Halts are for humans; questions are not.
• Spawn an agent with a diff, a hypothesis, or a summary of the session in its task text.