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          "tool_use_id": "call_30b01f6d94e54da6b3913ebe",
          "content": "Added:\n  + Inspect host: systemd unit, python, /opt/builder\n  + Write /opt/builder/app.py implementing the contract\n  + Start and enable builder-app.service\n  + Verify endpoints, durability (restart), and boot persistence\n\nCurrent tasks:\n  ◉ Inspect host: systemd unit, python, /opt/builder\n  ○ Write /opt/builder/app.py implementing the contract\n  ○ Start and enable builder-app.service\n  ○ Verify endpoints, durability (restart), and boot persistence\n"
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          "tool_use_id": "call_1364caba14534be0895fee21",
          "content": "[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\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 Thu 2026-08-20 02:39:10 UTC; 11s ago\n   Duration: 80ms\n Invocation: 74d48fd2d7f241afade87b072011d2a2\n    Process: 640 ExecStart=/nix/store/gxzhl7aaiid7zp3y47jqqiq7zg5mqpwp-python3-3.14.6/bin/python /opt/builder/app.py (code=exited, status=2)\n   Main PID: 640 (code=exited, status=2)\n         IP: 0B in, 0B out\n         IO: 0B read, 0B written\n   Mem peak: 4.3M\n        CPU: 41ms\n\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Scheduled restart job, restart counter is at 5.\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Start request repeated too quickly.\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Failed with result 'start-limit-hit'.\nAug 20 02:39:10 builder-one systemd[1]: Failed to start Agent-built application slot.\n"
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          "tool_use_id": "call_7e76e92413ce4f80b97dfd38",
          "content": "Python 3.14.6\n/run/current-system/sw/bin/python3\n"
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          "text": "The unit exists, is enabled, and uses python 3.14.6 from nix store. It failed because /opt/builder/app.py presumably doesn't exist. Let me check /opt/builder — the ls output didn't show; the first command's output combined? Actually output only shows python version lines; ls of /opt/builder probably printed nothing (no such directory) — actually it says nothing for ls. Let me check.\n\nI'll write the app: pure stdlib http.server with ThreadingHTTPServer, storing records on disk under /opt/builder/records (or /var/lib/builder-app). Durability: write file atomically (write temp + os.replace), maybe fsync. Also durability across reboot — disk persistence suffices.\n\nConcerns:\n- Exact body \"ready\" for /health.\n- PUT /records/<id> stores request body, returns 204.\n- GET /records/<id> returns exact stored body with 200. If not found — contract doesn't specify; return 404.\n- Handle any method/path properly.\n\nStorage dir: use a persistent path. /opt/builder/records or /var/lib/builder-app. /var/lib is standard and persists. I'll use /var/lib/builder-app/records. But careful: id might contain path traversal chars. Sanitize: require id to be safe filename (e.g., [A-Za-z0-9._-]+) else 400, or percent-decode and reject slashes. Keep simple: reject ids containing '/' or '..' or path separators.\n\nAlso should bind 0.0.0.0:8080 so referee can reach it.\n\nWrite app.py with ThreadingHTTPServer, override do_GET/do_PUT. Use BaseHTTPRequestHandler. Read Content-Length body for PUT. Write file with fsync and os.replace for atomicity. For GET, read file bytes and send with Content-Length. Disable request logging noise? Keep log_message minimal (write to stderr, fine).\n\nAlso allow_reuse_address = True.\n\nThen: daemon-reload not needed (unit unchanged), reset-failed, start. Verify with curl. Test restart durability: put a record, restart service, get it. Test enablement (already enabled). Reboot test — can't reboot? The contract says must survive host reboot; the unit is enabled (WantedBy=multi-user.target, \"enabled\" shown). That's what we can do; actually rebooting would kill my session and the host may not come back for me. The unit is enabled which guarantees return after reboot. I won't reboot — risky. But maybe the referee reboots. Enabled is enough.\n\nLet me check /opt/builder existence and create.",
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              "text": "uilder",
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        },
        {
          "type": "text",
          "text": "The unit exists, is enabled, and failed only because `app.py` is missing. Writing the app now."
        },
        {
          "type": "tool_use",
          "id": "call_fdc3562b0c384319a65ae4d1",
          "name": "Bash",
          "input": {
            "command": "ls -la /opt/builder 2>&1; mkdir -p /opt/builder /var/lib/builder-app/records",
            "description": "Check /opt/builder and create storage dir"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "call_fdc3562b0c384319a65ae4d1",
          "content": "ls: cannot access '/opt/builder': No such file or directory\n"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "tool_use",
          "id": "call_dc699b8f98dc4511a43f551b",
          "name": "Write",
          "input": {
            "content": "#!/usr/bin/env python3\n\"\"\"Durable key-value record service on port 8080 (stdlib only).\n\nGET /health        -> 200, body \"ready\"\nPUT /records/<id>  -> 204, stores raw request body\nGET /records/<id>  -> 200, returns exact stored body (404 if unknown)\n\"\"\"\n\nimport os\nimport re\nimport tempfile\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\n\nHOST = \"0.0.0.0\"\nPORT = 8080\nRECORDS_DIR = \"/var/lib/builder-app/records\"\n\nSAFE_ID = re.compile(r\"^[A-Za-z0-9._~-]+$\")\n\n\ndef record_path(record_id: str) -> str:\n    if not record_id or not SAFE_ID.match(record_id) or record_id in (\".\", \"..\"):\n        raise ValueError(\"invalid record id\")\n    return os.path.join(RECORDS_DIR, record_id)\n\n\nclass Handler(BaseHTTPRequestHandler):\n    protocol_version = \"HTTP/1.1\"\n    server_version = \"builder-app/1.0\"\n\n    def _send(self, status: int, body: bytes = b\"\", content_type: str = \"application/octet-stream\"):\n        self.send_response(status)\n        if body or status not in (204,):\n            self.send_header(\"Content-Type\", content_type)\n            self.send_header(\"Content-Length\", str(len(body)))\n        else:\n            self.send_header(\"Content-Length\", \"0\")\n        self.end_headers()\n        if body and self.command != \"HEAD\":\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\", \"text/plain\")\n            return\n        if path.startswith(\"/records/\"):\n            record_id = path[len(\"/records/\"):]\n            try:\n                path_on_disk = record_path(record_id)\n            except ValueError:\n                self._send(400, b\"invalid record id\\n\", \"text/plain\")\n                return\n            try:\n                with open(path_on_disk, \"rb\") as f:\n                    data = f.read()\n            except FileNotFoundError:\n                self._send(404, b\"not found\\n\", \"text/plain\")\n                return\n            self._send(200, data)\n            return\n        self._send(404, b\"not found\\n\", \"text/plain\")\n\n    def do_HEAD(self):\n        self.do_GET()\n\n    def do_PUT(self):\n        path = self.path.split(\"?\", 1)[0]\n        if not path.startswith(\"/records/\"):\n            self._send(404, b\"not found\\n\", \"text/plain\")\n            return\n        record_id = path[len(\"/records/\"):]\n        try:\n            path_on_disk = record_path(record_id)\n        except ValueError:\n            self._send(400, b\"invalid record id\\n\", \"text/plain\")\n            return\n\n        try:\n            length = int(self.headers.get(\"Content-Length\", \"0\"))\n        except ValueError:\n            self._send(400, b\"bad content-length\\n\", \"text/plain\")\n            return\n        if length < 0:\n            self._send(400, b\"bad content-length\\n\", \"text/plain\")\n            return\n        data = self.rfile.read(length) if length else b\"\"\n\n        os.makedirs(RECORDS_DIR, exist_ok=True)\n        fd, tmp = tempfile.mkstemp(dir=RECORDS_DIR, prefix=\".tmp-\")\n        try:\n            with os.fdopen(fd, \"wb\") as f:\n                f.write(data)\n                f.flush()\n                os.fsync(f.fileno())\n            os.replace(tmp, path_on_disk)\n            # Persist the directory entry so the record survives power loss.\n            dir_fd = os.open(RECORDS_DIR, os.O_RDONLY)\n            try:\n                os.fsync(dir_fd)\n            finally:\n                os.close(dir_fd)\n        except BaseException:\n            try:\n                os.unlink(tmp)\n            except OSError:\n                pass\n            raise\n        self._send(204)\n\n    def log_message(self, fmt, *args):\n        pass  # keep the journal quiet\n\n\nclass Server(ThreadingHTTPServer):\n    daemon_threads = True\n    allow_reuse_address = True\n\n\nif __name__ == \"__main__\":\n    os.makedirs(RECORDS_DIR, exist_ok=True)\n    Server((HOST, PORT), Handler).serve_forever()\n",
            "file_path": "/opt/builder/app.py"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "call_dc699b8f98dc4511a43f551b",
          "content": "Successfully wrote to /opt/builder/app.py"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "tool_use",
          "id": "call_4f8791bc48a044d6b62f9bb5",
          "name": "Bash",
          "input": {
            "command": "chmod +x /opt/builder/app.py; systemctl reset-failed builder-app.service; systemctl restart builder-app.service; sleep 1; systemctl status builder-app.service --no-pager | head -8",
            "description": "Start builder-app service and check status"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "call_4f8791bc48a044d6b62f9bb5",
          "content": "● builder-app.service - Agent-built application slot\n     Loaded: loaded (/etc/systemd/system/builder-app.service; enabled; preset: ignored)\n     Active: active (running) since Thu 2026-08-20 02:40:07 UTC; 1s ago\n Invocation: 553960675d1d4748bb69a732600ce3b7\n   Main PID: 1095 (python)\n         IP: 0B in, 0B out\n         IO: 0B read, 0B written\n      Tasks: 1 (limit: 811)\n"
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "tool_use",
          "id": "call_5a22f836625b4561af93f32d",
          "name": "TodoWrite",
          "input": {
            "todos": [
              {
                "activeForm": "Inspecting host and service unit",
                "content": "Inspect host: systemd unit, python, /opt/builder",
                "status": "completed"
              },
              {
                "activeForm": "Writing the application",
                "content": "Write /opt/builder/app.py implementing the contract",
                "status": "completed"
              },
              {
                "activeForm": "Starting and enabling the service",
                "content": "Start and enable builder-app.service",
                "status": "completed"
              },
              {
                "activeForm": "Verifying endpoints and durability",
                "content": "Verify endpoints, durability (restart), and boot persistence",
                "status": "in_progress"
              }
            ]
          }
        },
        {
          "type": "tool_use",
          "id": "call_f436bbd55e1b476ba2652012",
          "name": "Bash",
          "input": {
            "command": "echo \"--- health ---\"; curl -s -o /tmp/h -w \"code=%{http_code} body=\" http://127.0.0.1:8080/health; cat /tmp/h; echo; echo \"--- PUT ---\"; printf 'hello durable world \\xf0\\x9f\\x8c\\x8d' | curl -s -X PUT --data-binary @- -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/test1; echo \"--- GET ---\"; curl -s -o /tmp/g -w \"code=%{http_code} body=\" http://127.0.0.1:8080/records/test1; cat /tmp/g; echo; echo \"--- GET missing ---\"; curl -s -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/nope; echo \"--- empty body PUT ---\"; curl -s -X PUT -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/empty1; curl -s -o /tmp/e -w \"code=%{http_code} len=\" http://127.0.0.1:8080/records/empty1; wc -c < /tmp/e",
            "description": "Test health, PUT, GET, missing, empty-body cases"
          }
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "tool_result",
          "tool_use_id": "call_5a22f836625b4561af93f32d",
          "content": "Started:\n  > Verifying endpoints and durability\nCompleted:\n  ✓ Inspect host: systemd unit, python, /opt/builder\n  ✓ Write /opt/builder/app.py implementing the contract\n  ✓ Start and enable builder-app.service\n\nCurrent tasks:\n  ✓ Inspect host: systemd unit, python, /opt/builder\n  ✓ Write /opt/builder/app.py implementing the contract\n  ✓ Start and enable builder-app.service\n  ◉ Verify endpoints, durability (restart), and boot persistence\n"
        },
        {
          "type": "tool_result",
          "tool_use_id": "call_f436bbd55e1b476ba2652012",
          "content": "--- health ---\ncode=200 body=ready\n--- PUT ---\ncode=204\n--- GET ---\ncode=200 body=hello durable world 🌍\n--- GET missing ---\ncode=404\n--- empty body PUT ---\ncode=204\ncode=200 len=0\n"
        }
      ]
    }
  ],
  "tool_trace": [
    {
      "id": "call_30b01f6d94e54da6b3913ebe",
      "name": "TodoWrite",
      "input": {
        "todos": [
          {
            "activeForm": "Inspecting host and service unit",
            "content": "Inspect host: systemd unit, python, /opt/builder",
            "status": "in_progress"
          },
          {
            "activeForm": "Writing the application",
            "content": "Write /opt/builder/app.py implementing the contract",
            "status": "pending"
          },
          {
            "activeForm": "Starting and enabling the service",
            "content": "Start and enable builder-app.service",
            "status": "pending"
          },
          {
            "activeForm": "Verifying endpoints and durability",
            "content": "Verify endpoints, durability (restart), and boot persistence",
            "status": "pending"
          }
        ]
      },
      "output": "Added:\n  + Inspect host: systemd unit, python, /opt/builder\n  + Write /opt/builder/app.py implementing the contract\n  + Start and enable builder-app.service\n  + Verify endpoints, durability (restart), and boot persistence\n\nCurrent tasks:\n  ◉ Inspect host: systemd unit, python, /opt/builder\n  ○ Write /opt/builder/app.py implementing the contract\n  ○ Start and enable builder-app.service\n  ○ Verify endpoints, durability (restart), and boot persistence\n",
      "is_error": false,
      "read_only": true,
      "started_after_ms": 11131,
      "duration_ms": 0
    },
    {
      "id": "call_1364caba14534be0895fee21",
      "name": "Bash",
      "input": {
        "command": "cat /etc/systemd/system/builder-app.service 2>/dev/null; systemctl status builder-app.service --no-pager 2>&1 | head -20",
        "description": "Show builder-app unit file and status"
      },
      "output": "[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\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 Thu 2026-08-20 02:39:10 UTC; 11s ago\n   Duration: 80ms\n Invocation: 74d48fd2d7f241afade87b072011d2a2\n    Process: 640 ExecStart=/nix/store/gxzhl7aaiid7zp3y47jqqiq7zg5mqpwp-python3-3.14.6/bin/python /opt/builder/app.py (code=exited, status=2)\n   Main PID: 640 (code=exited, status=2)\n         IP: 0B in, 0B out\n         IO: 0B read, 0B written\n   Mem peak: 4.3M\n        CPU: 41ms\n\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Scheduled restart job, restart counter is at 5.\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Start request repeated too quickly.\nAug 20 02:39:10 builder-one systemd[1]: builder-app.service: Failed with result 'start-limit-hit'.\nAug 20 02:39:10 builder-one systemd[1]: Failed to start Agent-built application slot.\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 11131,
      "duration_ms": 134
    },
    {
      "id": "call_7e76e92413ce4f80b97dfd38",
      "name": "Bash",
      "input": {
        "command": "ls -la /opt/builder/ 2>/dev/null; python3 --version 2>&1; which python3",
        "description": "Check /opt/builder contents and python version"
      },
      "output": "Python 3.14.6\n/run/current-system/sw/bin/python3\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 11265,
      "duration_ms": 28
    },
    {
      "id": "call_fdc3562b0c384319a65ae4d1",
      "name": "Bash",
      "input": {
        "command": "ls -la /opt/builder 2>&1; mkdir -p /opt/builder /var/lib/builder-app/records",
        "description": "Check /opt/builder and create storage dir"
      },
      "output": "ls: cannot access '/opt/builder': No such file or directory\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 32889,
      "duration_ms": 21
    },
    {
      "id": "call_dc699b8f98dc4511a43f551b",
      "name": "Write",
      "input": {
        "content": "#!/usr/bin/env python3\n\"\"\"Durable key-value record service on port 8080 (stdlib only).\n\nGET /health        -> 200, body \"ready\"\nPUT /records/<id>  -> 204, stores raw request body\nGET /records/<id>  -> 200, returns exact stored body (404 if unknown)\n\"\"\"\n\nimport os\nimport re\nimport tempfile\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\n\nHOST = \"0.0.0.0\"\nPORT = 8080\nRECORDS_DIR = \"/var/lib/builder-app/records\"\n\nSAFE_ID = re.compile(r\"^[A-Za-z0-9._~-]+$\")\n\n\ndef record_path(record_id: str) -> str:\n    if not record_id or not SAFE_ID.match(record_id) or record_id in (\".\", \"..\"):\n        raise ValueError(\"invalid record id\")\n    return os.path.join(RECORDS_DIR, record_id)\n\n\nclass Handler(BaseHTTPRequestHandler):\n    protocol_version = \"HTTP/1.1\"\n    server_version = \"builder-app/1.0\"\n\n    def _send(self, status: int, body: bytes = b\"\", content_type: str = \"application/octet-stream\"):\n        self.send_response(status)\n        if body or status not in (204,):\n            self.send_header(\"Content-Type\", content_type)\n            self.send_header(\"Content-Length\", str(len(body)))\n        else:\n            self.send_header(\"Content-Length\", \"0\")\n        self.end_headers()\n        if body and self.command != \"HEAD\":\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\", \"text/plain\")\n            return\n        if path.startswith(\"/records/\"):\n            record_id = path[len(\"/records/\"):]\n            try:\n                path_on_disk = record_path(record_id)\n            except ValueError:\n                self._send(400, b\"invalid record id\\n\", \"text/plain\")\n                return\n            try:\n                with open(path_on_disk, \"rb\") as f:\n                    data = f.read()\n            except FileNotFoundError:\n                self._send(404, b\"not found\\n\", \"text/plain\")\n                return\n            self._send(200, data)\n            return\n        self._send(404, b\"not found\\n\", \"text/plain\")\n\n    def do_HEAD(self):\n        self.do_GET()\n\n    def do_PUT(self):\n        path = self.path.split(\"?\", 1)[0]\n        if not path.startswith(\"/records/\"):\n            self._send(404, b\"not found\\n\", \"text/plain\")\n            return\n        record_id = path[len(\"/records/\"):]\n        try:\n            path_on_disk = record_path(record_id)\n        except ValueError:\n            self._send(400, b\"invalid record id\\n\", \"text/plain\")\n            return\n\n        try:\n            length = int(self.headers.get(\"Content-Length\", \"0\"))\n        except ValueError:\n            self._send(400, b\"bad content-length\\n\", \"text/plain\")\n            return\n        if length < 0:\n            self._send(400, b\"bad content-length\\n\", \"text/plain\")\n            return\n        data = self.rfile.read(length) if length else b\"\"\n\n        os.makedirs(RECORDS_DIR, exist_ok=True)\n        fd, tmp = tempfile.mkstemp(dir=RECORDS_DIR, prefix=\".tmp-\")\n        try:\n            with os.fdopen(fd, \"wb\") as f:\n                f.write(data)\n                f.flush()\n                os.fsync(f.fileno())\n            os.replace(tmp, path_on_disk)\n            # Persist the directory entry so the record survives power loss.\n            dir_fd = os.open(RECORDS_DIR, os.O_RDONLY)\n            try:\n                os.fsync(dir_fd)\n            finally:\n                os.close(dir_fd)\n        except BaseException:\n            try:\n                os.unlink(tmp)\n            except OSError:\n                pass\n            raise\n        self._send(204)\n\n    def log_message(self, fmt, *args):\n        pass  # keep the journal quiet\n\n\nclass Server(ThreadingHTTPServer):\n    daemon_threads = True\n    allow_reuse_address = True\n\n\nif __name__ == \"__main__\":\n    os.makedirs(RECORDS_DIR, exist_ok=True)\n    Server((HOST, PORT), Handler).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": 50700,
      "duration_ms": 0
    },
    {
      "id": "call_4f8791bc48a044d6b62f9bb5",
      "name": "Bash",
      "input": {
        "command": "chmod +x /opt/builder/app.py; systemctl reset-failed builder-app.service; systemctl restart builder-app.service; sleep 1; systemctl status builder-app.service --no-pager | head -8",
        "description": "Start builder-app service and check status"
      },
      "output": "● builder-app.service - Agent-built application slot\n     Loaded: loaded (/etc/systemd/system/builder-app.service; enabled; preset: ignored)\n     Active: active (running) since Thu 2026-08-20 02:40:07 UTC; 1s ago\n Invocation: 553960675d1d4748bb69a732600ce3b7\n   Main PID: 1095 (python)\n         IP: 0B in, 0B out\n         IO: 0B read, 0B written\n      Tasks: 1 (limit: 811)\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 56445,
      "duration_ms": 1122
    },
    {
      "id": "call_5a22f836625b4561af93f32d",
      "name": "TodoWrite",
      "input": {
        "todos": [
          {
            "activeForm": "Inspecting host and service unit",
            "content": "Inspect host: systemd unit, python, /opt/builder",
            "status": "completed"
          },
          {
            "activeForm": "Writing the application",
            "content": "Write /opt/builder/app.py implementing the contract",
            "status": "completed"
          },
          {
            "activeForm": "Starting and enabling the service",
            "content": "Start and enable builder-app.service",
            "status": "completed"
          },
          {
            "activeForm": "Verifying endpoints and durability",
            "content": "Verify endpoints, durability (restart), and boot persistence",
            "status": "in_progress"
          }
        ]
      },
      "output": "Started:\n  > Verifying endpoints and durability\nCompleted:\n  ✓ Inspect host: systemd unit, python, /opt/builder\n  ✓ Write /opt/builder/app.py implementing the contract\n  ✓ Start and enable builder-app.service\n\nCurrent tasks:\n  ✓ Inspect host: systemd unit, python, /opt/builder\n  ✓ Write /opt/builder/app.py implementing the contract\n  ✓ Start and enable builder-app.service\n  ◉ Verify endpoints, durability (restart), and boot persistence\n",
      "is_error": false,
      "read_only": true,
      "started_after_ms": 68956,
      "duration_ms": 0
    },
    {
      "id": "call_f436bbd55e1b476ba2652012",
      "name": "Bash",
      "input": {
        "command": "echo \"--- health ---\"; curl -s -o /tmp/h -w \"code=%{http_code} body=\" http://127.0.0.1:8080/health; cat /tmp/h; echo; echo \"--- PUT ---\"; printf 'hello durable world \\xf0\\x9f\\x8c\\x8d' | curl -s -X PUT --data-binary @- -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/test1; echo \"--- GET ---\"; curl -s -o /tmp/g -w \"code=%{http_code} body=\" http://127.0.0.1:8080/records/test1; cat /tmp/g; echo; echo \"--- GET missing ---\"; curl -s -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/nope; echo \"--- empty body PUT ---\"; curl -s -X PUT -o /dev/null -w \"code=%{http_code}\\n\" http://127.0.0.1:8080/records/empty1; curl -s -o /tmp/e -w \"code=%{http_code} len=\" http://127.0.0.1:8080/records/empty1; wc -c < /tmp/e",
        "description": "Test health, PUT, GET, missing, empty-body cases"
      },
      "output": "--- health ---\ncode=200 body=ready\n--- PUT ---\ncode=204\n--- GET ---\ncode=200 body=hello durable world 🌍\n--- GET missing ---\ncode=404\n--- empty body PUT ---\ncode=204\ncode=200 len=0\n",
      "is_error": false,
      "read_only": false,
      "started_after_ms": 68956,
      "duration_ms": 209
    }
  ],
  "timing": {
    "total_duration_ms": 69165,
    "model_rounds": [
      {
        "index": 1,
        "started_after_ms": 0,
        "duration_ms": 11128,
        "status": "completed",
        "usage": {
          "input_tokens": 2718,
          "output_tokens": 402,
          "cache_read_tokens": 2688,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00250968
        }
      },
      {
        "index": 2,
        "started_after_ms": 11294,
        "duration_ms": 21594,
        "status": "completed",
        "usage": {
          "input_tokens": 4211,
          "output_tokens": 633,
          "cache_read_tokens": 2688,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00561628
        }
      },
      {
        "index": 3,
        "started_after_ms": 32911,
        "duration_ms": 17788,
        "status": "completed",
        "usage": {
          "input_tokens": 5288,
          "output_tokens": 949,
          "cache_read_tokens": 4160,
          "cache_creation_tokens": 0,
          "cost_usd": 0.0068364
        }
      },
      {
        "index": 4,
        "started_after_ms": 50701,
        "duration_ms": 5743,
        "status": "completed",
        "usage": {
          "input_tokens": 6250,
          "output_tokens": 64,
          "cache_read_tokens": 5248,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00304888
        }
      },
      {
        "index": 5,
        "started_after_ms": 57570,
        "duration_ms": 11383,
        "status": "completed",
        "usage": {
          "input_tokens": 6451,
          "output_tokens": 466,
          "cache_read_tokens": 6208,
          "cache_creation_tokens": 0,
          "cost_usd": 0.00400468
        }
      }
    ]
  }
}