hillclimb-brainstorm

hillclimb-brainstorm: diversify or focus the idea pool

The explicit "kick" hill-climbing search needs to escape local optima. Call it deliberately. It does NOT execute ideas or run the verifier; it only diagnoses the search and updates the idea list.

See hillclimb-execute skill's First principle. Never propose ideas that game the verifier. If the verifier itself is wrong, propose fixing it correctly, not making it more lenient.

Step 1: Locate state and read the search

STATE_PY="$PWD/.hillclimb/state.py"; STATE_HTML="$PWD/.hillclimb/state.html"
[ -f "$STATE_PY" ] && [ -f "$STATE_HTML" ] || { echo "no .hillclimb/, run the hillclimb-onboard skill first"; exit 1; }
python3 "$STATE_PY" read "$STATE_HTML"

Extract objective, baseline, best, all ideas[] (note status), and the last 5 runs[] with their verifications.

Step 2: Diagnose

Classify the recent state into one of four cases. State the diagnosis in one sentence to the user before generating ideas, so they understand the framing.

Diagnosis	Trigger	Bias
Cold start	≤1 verified run, or all ideas open	Broad, diverse, easy-first ideas
Promising	Most recent run improved best, or last few trend up	Exploitation, variants of what works (parameter sweeps, ablations, "more of the same but bigger")
Stuck	Last 3+ verified runs failed to improve best	Diversification, fundamentally different angles. List what's been tried so new ideas don't duplicate
No-signal	Many inconclusive verifications	Meta, propose verifier fixes (tighter checks, better metric) at high priority

(Hardcoded threshold "last 3", tune in this SKILL.md if your runs are unusually fast or slow.)

Step 3: Generate ideas

Two tools: pure reasoning, and a general-purpose subagent for diversification. Use the subagent for stuck and no-signal; pure reasoning is fine for cold start and promising.

When spawning the subagent, brief it with: project objective, the list of ideas already tried (titles + status), recent run summaries + verification notes, the current best. Ask for 5–8 distinct candidate directions with a one-line rationale each, biased to whichever case applies. Cap at ~300 words. Run it in foreground, you need the output.

Filter the returned ideas: drop fuzzy duplicates of existing title/description (case-insensitive). Pick the best 3–6.

Step 4: Append ideas, optionally reprioritise

python3 "$STATE_PY" append-idea "$STATE_HTML" \
  '{"title":"...","description":"...","priority":"high|medium|low"}' \
  --added-by brainstorm

Priority guidance:

• high, small effort, large expected payoff; aligns with current best direction (exploitation) OR opens a fundamentally different promising avenue (diversification when stuck).
• medium, default.
• low, speculative, mainly for breadth.

To abandon an existing idea that runs have actively disproved: set refuses list traversal, so read state, mutate the entry in memory, write the whole ideas array back:

IDEAS=$(python3 "$STATE_PY" read "$STATE_HTML" | python3 -c "
import json, sys
s = json.load(sys.stdin)
for i in s['ideas']:
    if i['id'] == '<I-id>': i['status'] = 'abandoned'
print(json.dumps(s['ideas']))
")
python3 "$STATE_PY" set "$STATE_HTML" ideas "$IDEAS"

In practice, leaving low-value ideas as low priority is usually enough. Abandon only when the noise actively hurts.

Step 5: Log and hand off

python3 "$STATE_PY" log "$STATE_HTML" brainstorm "<diagnosis>: added N ideas (<titles>)"

Tell the user the diagnosis, the ideas added, and "run the hillclimb-execute skill next."

Rules

• Don't add filler to hit a count. Three sharp ideas beat eight vague ones.
• Don't propose ideas already tried-and-failed unless you have specific new evidence or a flaw in the previous attempt to address.
• Don't propose verifier-loosening ideas. See First principle above. If the verifier is genuinely wrong, suggest fixing it correctly.
• Don't run the verifier or execute anything here.
• Never edit state.html by hand. Always go through state.py.
• If the verifier itself looks broken (everything inconclusive, scores not making sense), say so explicitly, don't paper over it with more ideas. Suggest the user fix verify.sh first.