{
  "schema_version": 2,
  "model": "moonshotai/kimi-k3",
  "outcome": {
    "status": "running"
  },
  "usage": {
    "input_tokens": 5169,
    "output_tokens": 1451,
    "cache_read_tokens": 15616,
    "cache_creation_tokens": 0,
    "cost_usd": 0.03642196
  },
  "messages": [
    {
      "role": "user",
      "content": "Build the service in the contract appended below on this blank host. Speed matters, but only a durable deployment can win.\n\n\nThe controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors.\n\n# Service contract\n\n# Durable service contract\n\nExpose an HTTP service on port 8080. `GET /health` must return status 200 and\nthe exact body `ready`. `PUT /records/<id>` stores the request body and returns\nstatus 204. `GET /records/<id>` returns the exact stored body with status 200.\n\nThe blank guest includes a dormant `builder-app.service` deployment slot whose\nexecutable path is `/opt/builder/app.py`. Supply the application there and start\nthe existing unit. Stored records must survive restart of that service and a\nhost reboot. The deployment must return without agent help after reboot."
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "reasoning",
          "text": "Let me explore the environment first: check the builder-app.service unit, /opt/builder, and what runtimes are available.",
          "details": [
            {
              "format": "unknown",
              "index": 0,
              "text": "Let me explore the environment first: check the builder-app.service unit, /opt/builder, and what runtimes are available.",
              "type": "reasoning.text"
            }
          ]
        },
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-8a9cae0e8fd70ab0",
          "name": "Bash",
          "input": {
            "command": "systemctl cat builder-app.service; ls -la /opt/builder/ 2>&1; systemctl status builder-app.service 2>&1 | head -5",
            "description": "Inspect builder-app service unit and slot directory"
          }
        },
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-afdd7f738c773498",
          "name": "Bash",
          "input": {
            "command": "which python3; python3 --version; ls /var/lib/builder 2>&1",
            "description": "Check python availability and data dir"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-8a9cae0e8fd70ab0",
          "content": "# /etc/systemd/system/builder-app.service -> /nix/store/bkhc7c1djj4z9s51r616fqfbc55zwdvs-unit-builder-app.service/builder-app.service\n[Unit]\nAfter=network.target\nDescription=Agent-built application slot\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/54jg0kk0cn5h7j19r0l8x36fmbfywwjj-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/bin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/bin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/bin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/bin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/bin:/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/sbin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/sbin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/sbin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/sbin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/2nndxyf3phkb5aggxm3c16sapa0f49kz-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/gxzhl7aaiid7zp3y47jqqiq7zg5mqpwp-python3-3.14.6/bin/python /opt/builder/app.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\nls: cannot access '/opt/builder/': No such file or directory\n× builder-app.service - Agent-built application slot\n     Loaded: loaded (/etc/systemd/system/builder-app.service; enabled; preset: ignored)\n     Active: failed (Result: start-limit-hit) since Sat 2026-09-12 02:32:29 UTC; 19s ago\n   Duration: 88ms\n Invocation: bf9392b660b7440892b76841a85bf6fb\n"
        },
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-afdd7f738c773498",
          "content": "/run/current-system/sw/bin/python3\nPython 3.14.6\nls: cannot access '/var/lib/builder': No such file or directory\n\nExit code: exit status: 2",
          "is_error": true
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "reasoning",
          "text": "The unit is enabled (WantedBy=multi-user.target → survives reboot). Create /opt/builder/app.py with a stdlib-only HTTP server storing records in a durable dir (e.g. /var/lib/builder/records or /opt/builder/data). Use ThreadingHTTPServer with proper PUT/GET handling. Persist each record as a file write + fsync (and fsync dir) for durability.\n\nWrite app.py using BaseHTTPRequestHandler. Must handle arbitrary binary bodies. GET /health exact \"ready\". Path parsing: /records/<id> — id may contain slashes? Assume single segment or just take everything after /records/.\n\nThen mkdir, start service, verify.",
          "details": [
            {
              "format": "unknown",
              "index": 0,
              "text": "The unit is enabled (WantedBy=multi-user.target → survives reboot). Create /opt/builder/app.py with a stdlib-only HTTP server storing records in a durable dir (e.g. /var/lib/builder/records or /opt/builder/data). Use ThreadingHTTPServer with proper PUT/GET handling. Persist each record as a file write + fsync (and fsync dir) for durability.\n\nWrite app.py using BaseHTTPRequestHandler. Must handle arbitrary binary bodies. GET /health exact \"ready\". Path parsing: /records/<id> — id may contain slashes? Assume single segment or just take everything after /records/.\n\nThen mkdir, start service, verify.",
              "type": "reasoning.text"
            }
          ]
        },
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-9685869e781ff651",
          "name": "Write",
          "input": {
            "content": "#!/usr/bin/env python3\n\"\"\"Durable record store: PUT/GET /records/<id>, GET /health.\"\"\"\n\nimport http.server\nimport os\nimport re\n\nHOST = \"0.0.0.0\"\nPORT = 8080\nDATA_DIR = \"/var/lib/builder/records\"\n\nSAFE_ID = re.compile(r\"^[A-Za-z0-9._~-]+$\")\n\nos.makedirs(DATA_DIR, exist_ok=True)\n\n\ndef record_path(record_id):\n    if not SAFE_ID.match(record_id) or record_id in (\".\", \"..\"):\n        return None\n    return os.path.join(DATA_DIR, record_id)\n\n\ndef fsync_dir(path):\n    fd = os.open(path, os.O_RDONLY)\n    try:\n        os.fsync(fd)\n    finally:\n        os.close(fd)\n\n\nclass Handler(http.server.BaseHTTPRequestHandler):\n    protocol_version = \"HTTP/1.1\"\n\n    def _send(self, status, body=b\"\"):\n        self.send_response(status)\n        self.send_header(\"Content-Type\", \"text/plain\")\n        self.send_header(\"Content-Length\", str(len(body)))\n        self.end_headers()\n        if body:\n            self.wfile.write(body)\n\n    def do_GET(self):\n        path = self.path.split(\"?\", 1)[0]\n        if path == \"/health\":\n            self._send(200, b\"ready\")\n            return\n        if path.startswith(\"/records/\"):\n            rid = path[len(\"/records/\"):]\n            rpath = record_path(rid)\n            if rpath is None:\n                self._send(400)\n                return\n            try:\n                with open(rpath, \"rb\") as f:\n                    body = f.read()\n            except OSError:\n                self._send(404)\n                return\n            self._send(200, body)\n            return\n        self._send(404)\n\n    def do_PUT(self):\n        path = self.path.split(\"?\", 1)[0]\n        if not path.startswith(\"/records/\"):\n            self._send(404)\n            return\n        rid = path[len(\"/records/\"):]\n        rpath = record_path(rid)\n        if rpath is None:\n            self._send(400)\n            return\n        length = int(self.headers.get(\"Content-Length\", 0))\n        body = self.rfile.read(length) if length > 0 else b\"\"\n        tmp = rpath + \".tmp\"\n        with open(tmp, \"wb\") as f:\n            f.write(body)\n            f.flush()\n            os.fsync(f.fileno())\n        os.replace(tmp, rpath)\n        fsync_dir(DATA_DIR)\n        self._send(204)\n\n    def log_message(self, fmt, *args):\n        pass\n\n\nserver = http.server.ThreadingHTTPServer((HOST, PORT), Handler)\nserver.serve_forever()\n",
            "file_path": "/opt/builder/app.py"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-9685869e781ff651",
          "content": "Successfully wrote to /opt/builder/app.py"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-8c2b875371733749",
          "name": "Bash",
          "input": {
            "command": "systemctl reset-failed builder-app.service && systemctl start builder-app.service && sleep 1 && systemctl is-active builder-app.service",
            "description": "Start the builder-app service"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-8c2b875371733749",
          "content": "active\n"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-aedfb0593fe3b0e8",
          "name": "Bash",
          "input": {
            "command": "curl -s -w '%{http_code} ' http://localhost:8080/health; echo; curl -s -o /dev/null -w '%{http_code}\\n' -X PUT --data-binary 'hello durable world' http://localhost:8080/records/rec1; curl -s -w '%{http_code} ' http://localhost:8080/records/rec1; echo; curl -s -o /dev/null -w '%{http_code}\\n' http://localhost:8080/records/missing",
            "description": "Verify health, PUT, GET, and 404 behavior"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-aedfb0593fe3b0e8",
          "content": "ready200 \n204\nhello durable world200 \n404\n"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "reasoning",
          "text": "All working. Now verify restart durability: restart service, check record still there. Then reboot the host (with user's implied request — contract says \"must survive reboot\", I should test it). Destroying action? Reboot is visible locally; the contract explicitly says to verify survival through reboot. It's a sandbox host; proceed.",
          "details": [
            {
              "format": "unknown",
              "index": 0,
              "text": "All working. Now verify restart durability: restart service, check record still there. Then reboot the host (with user's implied request — contract says \"must survive reboot\", I should test it). Destroying action? Reboot is visible locally; the contract explicitly says to verify survival through reboot. It's a sandbox host; proceed.",
              "type": "reasoning.text"
            }
          ]
        },
        {
          "type": "text",
          "text": "All endpoints verified. Now testing restart and reboot durability:"
        },
        {
          "type": "tool_use",
          "id": "chatcmpl-tool-9b74626466f9ee87",
          "name": "Bash",
          "input": {
            "command": "systemctl restart builder-app.service && sleep 1 && curl -s http://localhost:8080/records/rec1 && echo && systemctl is-enabled builder-app.service && systemctl is-active builder-app.service",
            "description": "Restart service and confirm record survives"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "chatcmpl-tool-9b74626466f9ee87",
          "content": "hello durable world\nenabled\nactive\n"
        }
      ]
    }
  ],
  "tool_trace": [
    {
      "id": "chatcmpl-tool-8a9cae0e8fd70ab0",
      "name": "Bash",
      "input": {
        "command": "systemctl cat builder-app.service; ls -la /opt/builder/ 2>&1; systemctl status builder-app.service 2>&1 | head -5",
        "description": "Inspect builder-app service unit and slot directory"
      },
      "output": "# /etc/systemd/system/builder-app.service -> /nix/store/bkhc7c1djj4z9s51r616fqfbc55zwdvs-unit-builder-app.service/builder-app.service\n[Unit]\nAfter=network.target\nDescription=Agent-built application slot\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/54jg0kk0cn5h7j19r0l8x36fmbfywwjj-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/bin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/bin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/bin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/bin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/bin:/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/sbin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/sbin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/sbin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/sbin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/2nndxyf3phkb5aggxm3c16sapa0f49kz-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/gxzhl7aaiid7zp3y47jqqiq7zg5mqpwp-python3-3.14.6/bin/python /opt/builder/app.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\nls: cannot access '/opt/builder/': No such file or directory\n× builder-app.service - Agent-built application slot\n     Loaded: loaded (/etc/systemd/system/builder-app.service; enabled; preset: ignored)\n     Active: failed (Result: start-limit-hit) since Sat 2026-09-12 02:32:29 UTC; 19s ago\n   Duration: 88ms\n Invocation: bf9392b660b7440892b76841a85bf6fb\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 18641,
      "duration_ms": 59
    },
    {
      "id": "chatcmpl-tool-afdd7f738c773498",
      "name": "Bash",
      "input": {
        "command": "which python3; python3 --version; ls /var/lib/builder 2>&1",
        "description": "Check python availability and data dir"
      },
      "output": "/run/current-system/sw/bin/python3\nPython 3.14.6\nls: cannot access '/var/lib/builder': No such file or directory\n\nExit code: exit status: 2",
      "is_error": true,
      "read_only": false,
      "started_after_ms": 18700,
      "duration_ms": 35
    },
    {
      "id": "chatcmpl-tool-9685869e781ff651",
      "name": "Write",
      "input": {
        "content": "#!/usr/bin/env python3\n\"\"\"Durable record store: PUT/GET /records/<id>, GET /health.\"\"\"\n\nimport http.server\nimport os\nimport re\n\nHOST = \"0.0.0.0\"\nPORT = 8080\nDATA_DIR = \"/var/lib/builder/records\"\n\nSAFE_ID = re.compile(r\"^[A-Za-z0-9._~-]+$\")\n\nos.makedirs(DATA_DIR, exist_ok=True)\n\n\ndef record_path(record_id):\n    if not SAFE_ID.match(record_id) or record_id in (\".\", \"..\"):\n        return None\n    return os.path.join(DATA_DIR, record_id)\n\n\ndef fsync_dir(path):\n    fd = os.open(path, os.O_RDONLY)\n    try:\n        os.fsync(fd)\n    finally:\n        os.close(fd)\n\n\nclass Handler(http.server.BaseHTTPRequestHandler):\n    protocol_version = \"HTTP/1.1\"\n\n    def _send(self, status, body=b\"\"):\n        self.send_response(status)\n        self.send_header(\"Content-Type\", \"text/plain\")\n        self.send_header(\"Content-Length\", str(len(body)))\n        self.end_headers()\n        if body:\n            self.wfile.write(body)\n\n    def do_GET(self):\n        path = self.path.split(\"?\", 1)[0]\n        if path == \"/health\":\n            self._send(200, b\"ready\")\n            return\n        if path.startswith(\"/records/\"):\n            rid = path[len(\"/records/\"):]\n            rpath = record_path(rid)\n            if rpath is None:\n                self._send(400)\n                return\n            try:\n                with open(rpath, \"rb\") as f:\n                    body = f.read()\n            except OSError:\n                self._send(404)\n                return\n            self._send(200, body)\n            return\n        self._send(404)\n\n    def do_PUT(self):\n        path = self.path.split(\"?\", 1)[0]\n        if not path.startswith(\"/records/\"):\n            self._send(404)\n            return\n        rid = path[len(\"/records/\"):]\n        rpath = record_path(rid)\n        if rpath is None:\n            self._send(400)\n            return\n        length = int(self.headers.get(\"Content-Length\", 0))\n        body = self.rfile.read(length) if length > 0 else b\"\"\n        tmp = rpath + \".tmp\"\n        with open(tmp, \"wb\") as f:\n            f.write(body)\n            f.flush()\n            os.fsync(f.fileno())\n        os.replace(tmp, rpath)\n        fsync_dir(DATA_DIR)\n        self._send(204)\n\n    def log_message(self, fmt, *args):\n        pass\n\n\nserver = http.server.ThreadingHTTPServer((HOST, PORT), Handler)\nserver.serve_forever()\n",
        "file_path": "/opt/builder/app.py"
      },
      "output": "Successfully wrote to /opt/builder/app.py",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 45385,
      "duration_ms": 0
    },
    {
      "id": "chatcmpl-tool-8c2b875371733749",
      "name": "Bash",
      "input": {
        "command": "systemctl reset-failed builder-app.service && systemctl start builder-app.service && sleep 1 && systemctl is-active builder-app.service",
        "description": "Start the builder-app service"
      },
      "output": "active\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 49688,
      "duration_ms": 1152
    },
    {
      "id": "chatcmpl-tool-aedfb0593fe3b0e8",
      "name": "Bash",
      "input": {
        "command": "curl -s -w '%{http_code} ' http://localhost:8080/health; echo; curl -s -o /dev/null -w '%{http_code}\\n' -X PUT --data-binary 'hello durable world' http://localhost:8080/records/rec1; curl -s -w '%{http_code} ' http://localhost:8080/records/rec1; echo; curl -s -o /dev/null -w '%{http_code}\\n' http://localhost:8080/records/missing",
        "description": "Verify health, PUT, GET, and 404 behavior"
      },
      "output": "ready200 \n204\nhello durable world200 \n404\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 57620,
      "duration_ms": 103
    },
    {
      "id": "chatcmpl-tool-9b74626466f9ee87",
      "name": "Bash",
      "input": {
        "command": "systemctl restart builder-app.service && sleep 1 && curl -s http://localhost:8080/records/rec1 && echo && systemctl is-enabled builder-app.service && systemctl is-active builder-app.service",
        "description": "Restart service and confirm record survives"
      },
      "output": "hello durable world\nenabled\nactive\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 65594,
      "duration_ms": 1150
    }
  ],
  "timing": {
    "total_duration_ms": 66745,
    "model_rounds": [
      {
        "index": 1,
        "started_after_ms": 0,
        "duration_ms": 18640,
        "status": "completed",
        "usage": {
          "input_tokens": 2812,
          "output_tokens": 198,
          "cache_read_tokens": 0,
          "cache_creation_tokens": 0,
          "cost_usd": 0.0097347
        }
      },
      {
        "index": 2,
        "started_after_ms": 18835,
        "duration_ms": 26549,
        "status": "completed",
        "usage": {
          "input_tokens": 1066,
          "output_tokens": 788,
          "cache_read_tokens": 2688,
          "cache_creation_tokens": 0,
          "cost_usd": 0.01368898
        }
      },
      {
        "index": 3,
        "started_after_ms": 45388,
        "duration_ms": 4297,
        "status": "completed",
        "usage": {
          "input_tokens": 868,
          "output_tokens": 94,
          "cache_read_tokens": 3712,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00448862
        }
      },
      {
        "index": 4,
        "started_after_ms": 50841,
        "duration_ms": 6779,
        "status": "completed",
        "usage": {
          "input_tokens": 98,
          "output_tokens": 185,
          "cache_read_tokens": 4608,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00395893
        }
      },
      {
        "index": 5,
        "started_after_ms": 57724,
        "duration_ms": 7869,
        "status": "completed",
        "usage": {
          "input_tokens": 325,
          "output_tokens": 186,
          "cache_read_tokens": 4608,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00455073
        }
      }
    ]
  }
}