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#!/bin/bash
# gan-harness.sh — GAN-Style Generator-Evaluator Harness Orchestrator
#
# Inspired by Anthropic's "Harness Design for Long-Running Application Development"
# https://www.anthropic.com/engineering/harness-design-long-running-apps
#
# Usage:
# ./scripts/gan-harness.sh "Build a music streaming dashboard"
# GAN_MAX_ITERATIONS=10 GAN_PASS_THRESHOLD=8.0 ./scripts/gan-harness.sh "Build a Kanban board"
#
# Environment Variables:
# GAN_MAX_ITERATIONS — Max generator-evaluator cycles (default: 15)
# GAN_PASS_THRESHOLD — Weighted score to pass, 1-10 (default: 7.0)
# GAN_PLANNER_MODEL — Model for planner (default: opus)
# GAN_GENERATOR_MODEL — Model for generator (default: opus)
# GAN_EVALUATOR_MODEL — Model for evaluator (default: opus)
# GAN_DEV_SERVER_PORT — Port for live app (default: 3000)
# GAN_DEV_SERVER_CMD — Command to start dev server (default: "npm run dev")
# GAN_PROJECT_DIR — Working directory (default: current dir)
# GAN_SKIP_PLANNER — Set to "true" to skip planner phase
# GAN_EVAL_MODE — playwright, screenshot, or code-only (default: playwright)
set -euo pipefail
# ─── Configuration ───────────────────────────────────────────────────────────
BRIEF="${1:?Usage: ./scripts/gan-harness.sh \"description of what to build\"}"
MAX_ITERATIONS="${GAN_MAX_ITERATIONS:-15}"
PASS_THRESHOLD="${GAN_PASS_THRESHOLD:-7.0}"
PLANNER_MODEL="${GAN_PLANNER_MODEL:-opus}"
GENERATOR_MODEL="${GAN_GENERATOR_MODEL:-opus}"
EVALUATOR_MODEL="${GAN_EVALUATOR_MODEL:-opus}"
DEV_PORT="${GAN_DEV_SERVER_PORT:-3000}"
DEV_CMD="${GAN_DEV_SERVER_CMD:-npm run dev}"
PROJECT_DIR="${GAN_PROJECT_DIR:-.}"
SKIP_PLANNER="${GAN_SKIP_PLANNER:-false}"
EVAL_MODE="${GAN_EVAL_MODE:-playwright}"
HARNESS_DIR="${PROJECT_DIR}/gan-harness"
FEEDBACK_DIR="${HARNESS_DIR}/feedback"
SCREENSHOTS_DIR="${HARNESS_DIR}/screenshots"
START_TIME=$(date +%s)
# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
PURPLE='\033[0;35m'
CYAN='\033[0;36m'
NC='\033[0m'
# ─── Helpers ─────────────────────────────────────────────────────────────────
log() { echo -e "${BLUE}[GAN-HARNESS]${NC} $*"; }
ok() { echo -e "${GREEN}[✓]${NC} $*"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $*"; }
fail() { echo -e "${RED}[✗]${NC} $*"; }
phase() { echo -e "\n${PURPLE}═══════════════════════════════════════════════${NC}"; echo -e "${PURPLE} $*${NC}"; echo -e "${PURPLE}═══════════════════════════════════════════════${NC}\n"; }
extract_score() {
# Extract the TOTAL weighted score from a feedback file
local file="$1"
# Look for **TOTAL** or **X.X/10** pattern
grep -oP '(?<=\*\*TOTAL\*\*.*\*\*)[0-9]+\.[0-9]+' "$file" 2>/dev/null \
|| grep -oP '(?<=TOTAL.*\|.*\| \*\*)[0-9]+\.[0-9]+' "$file" 2>/dev/null \
|| grep -oP 'Verdict:.*([0-9]+\.[0-9]+)' "$file" 2>/dev/null | grep -oP '[0-9]+\.[0-9]+' \
|| echo "0.0"
}
score_passes() {
local score="$1"
local threshold="$2"
awk -v s="$score" -v t="$threshold" 'BEGIN { exit !(s >= t) }'
}
elapsed() {
local now=$(date +%s)
local diff=$((now - START_TIME))
printf '%dh %dm %ds' $((diff/3600)) $((diff%3600/60)) $((diff%60))
}
# ─── Setup ───────────────────────────────────────────────────────────────────
phase "GAN-STYLE HARNESS — Setup"
log "Brief: ${CYAN}${BRIEF}${NC}"
log "Max iterations: $MAX_ITERATIONS"
log "Pass threshold: $PASS_THRESHOLD"
log "Models: Planner=$PLANNER_MODEL, Generator=$GENERATOR_MODEL, Evaluator=$EVALUATOR_MODEL"
log "Eval mode: $EVAL_MODE"
log "Project dir: $PROJECT_DIR"
mkdir -p "$FEEDBACK_DIR" "$SCREENSHOTS_DIR"
# Initialize git if needed
if [ ! -d "${PROJECT_DIR}/.git" ]; then
git -C "$PROJECT_DIR" init
ok "Initialized git repository"
fi
# Write config
cat > "${HARNESS_DIR}/config.json" << EOF
{
"brief": "$BRIEF",
"maxIterations": $MAX_ITERATIONS,
"passThreshold": $PASS_THRESHOLD,
"models": {
"planner": "$PLANNER_MODEL",
"generator": "$GENERATOR_MODEL",
"evaluator": "$EVALUATOR_MODEL"
},
"evalMode": "$EVAL_MODE",
"devServerPort": $DEV_PORT,
"startedAt": "$(date -Iseconds)"
}
EOF
ok "Harness directory created: $HARNESS_DIR"
# ─── Phase 1: Planning ──────────────────────────────────────────────────────
if [ "$SKIP_PLANNER" = "true" ] && [ -f "${HARNESS_DIR}/spec.md" ]; then
phase "PHASE 1: Planning — SKIPPED (spec.md exists)"
else
phase "PHASE 1: Planning"
log "Launching Planner agent (model: $PLANNER_MODEL)..."
claude -p --model "$PLANNER_MODEL" \
"You are the Planner in a GAN-style harness. Read the agent definition in agents/gan-planner.md for your full instructions.
Your brief: \"$BRIEF\"
Create two files:
1. gan-harness/spec.md — Full product specification
2. gan-harness/eval-rubric.md — Evaluation criteria for the Evaluator
Be ambitious. Push for 12-16 features. Specify exact colors, fonts, and layouts. Don't be generic." \
2>&1 | tee "${HARNESS_DIR}/planner-output.log"
if [ -f "${HARNESS_DIR}/spec.md" ]; then
ok "Spec generated: $(wc -l < "${HARNESS_DIR}/spec.md") lines"
else
fail "Planner did not produce spec.md!"
exit 1
fi
fi
# ─── Phase 2: Generator-Evaluator Loop ──────────────────────────────────────
phase "PHASE 2: Generator-Evaluator Loop"
SCORES=()
PREV_SCORE="0.0"
PLATEAU_COUNT=0
for (( i=1; i<=MAX_ITERATIONS; i++ )); do
echo ""
log "━━━ Iteration $i / $MAX_ITERATIONS ━━━"
# ── GENERATE ──
echo -e "${GREEN}>> GENERATOR (iteration $i)${NC}"
FEEDBACK_CONTEXT=""
if [ $i -gt 1 ] && [ -f "${FEEDBACK_DIR}/feedback-$(printf '%03d' $((i-1))).md" ]; then
FEEDBACK_CONTEXT="IMPORTANT: Read and address ALL issues in gan-harness/feedback/feedback-$(printf '%03d' $((i-1))).md before doing anything else."
fi
claude -p --model "$GENERATOR_MODEL" \
"You are the Generator in a GAN-style harness. Read agents/gan-generator.md for full instructions.
Iteration: $i
$FEEDBACK_CONTEXT
Read gan-harness/spec.md for the product specification.
Build/improve the application. Ensure the dev server runs on port $DEV_PORT.
Commit your changes with message: 'iteration-$(printf '%03d' $i): [describe what you did]'
Update gan-harness/generator-state.md." \
2>&1 | tee "${HARNESS_DIR}/generator-${i}.log"
ok "Generator completed iteration $i"
# ── EVALUATE ──
echo -e "${RED}>> EVALUATOR (iteration $i)${NC}"
claude -p --model "$EVALUATOR_MODEL" \
--allowedTools "Read,Write,Bash,Grep,Glob" \
"You are the Evaluator in a GAN-style harness. Read agents/gan-evaluator.md for full instructions.
Iteration: $i
Eval mode: $EVAL_MODE
Dev server: http://localhost:$DEV_PORT
1. Read gan-harness/eval-rubric.md for scoring criteria
2. Read gan-harness/spec.md for feature requirements
3. Read gan-harness/generator-state.md for what was built
4. Test the live application (mode: $EVAL_MODE)
5. Score against the rubric (1-10 per criterion)
6. Write detailed feedback to gan-harness/feedback/feedback-$(printf '%03d' $i).md
Be RUTHLESSLY strict. A 7 means genuinely good, not 'good for AI.'
Include the weighted TOTAL score in the format: | **TOTAL** | | | **X.X** |" \
2>&1 | tee "${HARNESS_DIR}/evaluator-${i}.log"
FEEDBACK_FILE="${FEEDBACK_DIR}/feedback-$(printf '%03d' $i).md"
if [ -f "$FEEDBACK_FILE" ]; then
SCORE=$(extract_score "$FEEDBACK_FILE")
SCORES+=("$SCORE")
ok "Evaluator completed. Score: ${CYAN}${SCORE}${NC} / 10.0 (threshold: $PASS_THRESHOLD)"
else
warn "Evaluator did not produce feedback file. Assuming score 0.0"
SCORE="0.0"
SCORES+=("0.0")
fi
# ── CHECK PASS ──
if score_passes "$SCORE" "$PASS_THRESHOLD"; then
echo ""
ok "PASSED at iteration $i with score $SCORE (threshold: $PASS_THRESHOLD)"
break
fi
# ── CHECK PLATEAU ──
SCORE_DIFF=$(awk -v s="$SCORE" -v p="$PREV_SCORE" 'BEGIN { printf "%.1f", s - p }')
if [ $i -ge 3 ] && awk -v d="$SCORE_DIFF" 'BEGIN { exit !(d <= 0.2) }'; then
PLATEAU_COUNT=$((PLATEAU_COUNT + 1))
else
PLATEAU_COUNT=0
fi
if [ $PLATEAU_COUNT -ge 2 ]; then
warn "Score plateau detected (no improvement for 2 iterations). Stopping early."
break
fi
PREV_SCORE="$SCORE"
done
# ─── Phase 3: Summary ───────────────────────────────────────────────────────
phase "PHASE 3: Build Report"
FINAL_SCORE="${SCORES[-1]:-0.0}"
NUM_ITERATIONS=${#SCORES[@]}
ELAPSED=$(elapsed)
# Build score progression table
SCORE_TABLE="| Iter | Score |\n|------|-------|\n"
for (( j=0; j<${#SCORES[@]}; j++ )); do
SCORE_TABLE+="| $((j+1)) | ${SCORES[$j]} |\n"
done
# Write report
cat > "${HARNESS_DIR}/build-report.md" << EOF
# GAN Harness Build Report
**Brief:** $BRIEF
**Result:** $(score_passes "$FINAL_SCORE" "$PASS_THRESHOLD" && echo "PASS" || echo "FAIL")
**Iterations:** $NUM_ITERATIONS / $MAX_ITERATIONS
**Final Score:** $FINAL_SCORE / 10.0 (threshold: $PASS_THRESHOLD)
**Elapsed:** $ELAPSED
## Score Progression
$(echo -e "$SCORE_TABLE")
## Configuration
- Planner model: $PLANNER_MODEL
- Generator model: $GENERATOR_MODEL
- Evaluator model: $EVALUATOR_MODEL
- Eval mode: $EVAL_MODE
- Pass threshold: $PASS_THRESHOLD
## Files
- \`gan-harness/spec.md\` — Product specification
- \`gan-harness/eval-rubric.md\` — Evaluation rubric
- \`gan-harness/feedback/\` — All evaluation feedback ($NUM_ITERATIONS files)
- \`gan-harness/generator-state.md\` — Final generator state
- \`gan-harness/build-report.md\` — This report
EOF
ok "Report written to ${HARNESS_DIR}/build-report.md"
echo ""
log "━━━ Final Results ━━━"
if score_passes "$FINAL_SCORE" "$PASS_THRESHOLD"; then
echo -e "${GREEN} Result: PASS${NC}"
else
echo -e "${RED} Result: FAIL${NC}"
fi
echo -e " Score: ${CYAN}${FINAL_SCORE}${NC} / 10.0"
echo -e " Iterations: ${NUM_ITERATIONS} / ${MAX_ITERATIONS}"
echo -e " Elapsed: ${ELAPSED}"
echo ""
log "Done! Review the build at http://localhost:$DEV_PORT"
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