GPT-6.1 Sol (effort default (no reasoning-effort override) · thinking on) on Reach a goal stack configuration using a simulator CLI with minimal moves

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{"type": "turn.started"}
{"type": "item.completed", "item": {"id": "item_0", "type": "agent_message", "text": "I\u2019ll read the simulator rules and goal, then plan the moves before changing the stacks."}}
{"type": "item.started", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc 'python wh.py status'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc 'python wh.py status'", "aggregated_output": "/bin/bash: line 1: python: command not found\n", "exit_code": 127, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat goal.json'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat goal.json'", "aggregated_output": "{\"A\":[],\"B\":[\"a\",\"b\",\"f\",\"d\",\"e\"],\"C\":[\"c\"],\"D\":[]}\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc 'command -v python3; cat wh.py'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc 'command -v python3; cat wh.py'", "aggregated_output": "/usr/bin/python3\n#!/usr/bin/env python3\n\"\"\"Warehouse stacking simulator. Usage:\n  python wh.py status            show stacks (bottom -> top) and the goal\n  python wh.py move SRC DST      move the TOP crate of stack SRC onto stack DST\nRules: a crate may only be placed on an empty stack or on a crate whose weight is >= its own.\nStack 'D' is a dock with capacity 2 crates. Every call is appended to calls.log; invalid moves are rejected (still logged, count as moves).\n\"\"\"\nimport json,sys,os\nH=os.path.dirname(os.path.abspath(__file__)); S=os.path.join(H,\"state.json\")\nW={\"a\":5,\"b\":4,\"c\":3,\"d\":2,\"e\":1,\"f\":3}\ndef legal(st,src,dst):\n    if src not in st or dst not in st or src==dst or not st[src]: return \"bad stacks\"\n    c=st[src][-1]\n    if dst==\"D\" and len(st[\"D\"])>=2: return \"dock full\"\n    if st[dst] and W[st[dst][-1]]<W[c]: return f\"{c} (w{W[c]}) cannot go on {st[dst][-1]} (w{W[st[dst][-1]]})\"\n    return None\ndef main(a):\n    st=json.load(open(S)); goal=json.load(open(os.path.join(H,\"goal.json\")))\n    with open(os.path.join(H,\"calls.log\"),\"a\") as f: f.write(\" \".join(a)+\"\\n\")\n    if a[:1]==[\"status\"]:\n        for k in sorted(st): print(f\"{k}: {' '.join(f'{c}(w{W[c]})' for c in st[k])}\")\n        print(\"goal:\",json.dumps(goal)); return 0\n    if len(a)==3 and a[0]==\"move\":\n        e=legal(st,a[1],a[2])\n        if e: print(\"REJECTED:\",e); return 1\n        st[a[2]].append(st[a[1]].pop()); json.dump(st,open(S,\"w\")); print(\"ok\"); return 0\n    print(__doc__); return 2\nif __name__==\"__main__\": sys.exit(main(sys.argv[1:]))\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc 'python() { python3 \"$@\"; }\npython wh.py status'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc 'python() { python3 \"$@\"; }\npython wh.py status'", "aggregated_output": "A: a(w5) c(w3) e(w1)\nB: b(w4) d(w2)\nC: f(w3)\nD: \ngoal: {\"A\": [], \"B\": [\"a\", \"b\", \"f\", \"d\", \"e\"], \"C\": [\"c\"], \"D\": []}\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport json\nfrom collections import deque\nkeys='ABCD'; w={'a':5,'b':4,'c':3,'d':2,'e':1,'f':3}\nstart=tuple(tuple(json.load(open('state.json'))[k]) for k in keys)\ngoal=tuple(tuple(json.load(open('goal.json'))[k]) for k in keys)\nq=deque([start]); prev={start:None}\nwhile q:\n s=q.popleft()\n if s==goal: break\n for i in range(4):\n  if not s[i]: continue\n  for j in range(4):\n   if i==j or (j==3 and len(s[j])>=2) or (s[j] and w[s[j][-1]]<w[s[i][-1]]): continue\n   t=list(s); t[i]=s[i][:-1]; t[j]=s[j]+(s[i][-1],); t=tuple(t)\n   if t not in prev: prev[t]=(s,keys[i],keys[j]); q.append(t)\nelse: raise Exception('No solution')\npath=[]\nwhile prev[s]:\n s,a,b=prev[s]; path.append((a,b))\npath.reverse()\nprint('Shortest move count:',len(path))\nfor a,b in path: print('python wh.py move',a,b)\nopen('/tmp/warehouse_plan.json','w').write(json.dumps(path))\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport json\nfrom collections import deque\nkeys='ABCD'; w={'a':5,'b':4,'c':3,'d':2,'e':1,'f':3}\nstart=tuple(tuple(json.load(open('state.json'))[k]) for k in keys)\ngoal=tuple(tuple(json.load(open('goal.json'))[k]) for k in keys)\nq=deque([start]); prev={start:None}\nwhile q:\n s=q.popleft()\n if s==goal: break\n for i in range(4):\n  if not s[i]: continue\n  for j in range(4):\n   if i==j or (j==3 and len(s[j])>=2) or (s[j] and w[s[j][-1]]<w[s[i][-1]]): continue\n   t=list(s); t[i]=s[i][:-1]; t[j]=s[j]+(s[i][-1],); t=tuple(t)\n   if t not in prev: prev[t]=(s,keys[i],keys[j]); q.append(t)\nelse: raise Exception('No solution')\npath=[]\nwhile prev[s]:\n s,a,b=prev[s]; path.append((a,b))\npath.reverse()\nprint('Shortest move count:',len(path))\nfor a,b in path: print('python wh.py move',a,b)\nopen('/tmp/warehouse_plan.json','w').write(json.dumps(path))\nPY\"", "aggregated_output": "Shortest move count: 13\npython wh.py move B C\npython wh.py move A C\npython wh.py move B D\npython wh.py move A D\npython wh.py move A B\npython wh.py move D A\npython wh.py move C A\npython wh.py move D B\npython wh.py move C D\npython wh.py move C B\npython wh.py move D B\npython wh.py move A B\npython wh.py move A C\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_6", "type": "agent_message", "text": "The shortest legal plan is 13 moves, verified by breadth-first search. I\u2019ll execute it now."}}
{"type": "item.started", "item": {"id": "item_7", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport json, subprocess, os, tempfile\np=tempfile.mkdtemp(prefix='warehouse-python-',dir='/tmp')\nos.symlink('/usr/bin/python3',p+'/python')\nenv=dict(os.environ,PATH=p+':'+os.environ['PATH'])\nfor src,dst in json.load(open('/tmp/warehouse_plan.json')):\n r=subprocess.run(['python','wh.py','move',src,dst],env=env,capture_output=True,text=True)\n print(src+' -> '+dst+': '+r.stdout.strip())\n if r.returncode: raise SystemExit(r.returncode)\nst=json.load(open('state.json')); goal=json.load(open('goal.json'))\nassert st==goal,(st,goal)\nprint('Verified: state matches goal.')\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_7", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nimport json, subprocess, os, tempfile\np=tempfile.mkdtemp(prefix='warehouse-python-',dir='/tmp')\nos.symlink('/usr/bin/python3',p+'/python')\nenv=dict(os.environ,PATH=p+':'+os.environ['PATH'])\nfor src,dst in json.load(open('/tmp/warehouse_plan.json')):\n r=subprocess.run(['python','wh.py','move',src,dst],env=env,capture_output=True,text=True)\n print(src+' -> '+dst+': '+r.stdout.strip())\n if r.returncode: raise SystemExit(r.returncode)\nst=json.load(open('state.json')); goal=json.load(open('goal.json'))\nassert st==goal,(st,goal)\nprint('Verified: state matches goal.')\nPY\"", "aggregated_output": "B -> C: ok\nA -> C: ok\nB -> D: ok\nA -> D: ok\nA -> B: ok\nD -> A: ok\nC -> A: ok\nD -> B: ok\nC -> D: ok\nC -> B: ok\nD -> B: ok\nA -> B: ok\nA -> C: ok\nVerified: state matches goal.\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_8", "type": "agent_message", "text": "Reached and verified the goal in **13 moves**, the shortest possible plan. No rejected moves."}}
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