{
  "study_id": "example-chat-window",
  "hardware": {
    "gpu_count": 8,
    "gpu_model": "H20",
    "host_candidates": ["dash0", "dash1"]
  },
  "model": {
    "model_id": "qwen3-30b",
    "served_model_name": "Qwen/Qwen3-30B-A3B-Instruct-2507"
  },
  "engine": {
    "engine_name": "vllm",
    "engine_version": "0.x",
    "exec_path": "/usr/local/bin/vllm",
    "cwd": ".",
    "host": "127.0.0.1",
    "port": 8000,
    "healthcheck_path": "/v1/models",
    "ready_timeout_s": 600,
    "request_timeout_s": 600,
    "launch_args": [
      "serve",
      "/path/to/model"
    ],
    "base_envs": {},
    "base_flags": {
      "host": "127.0.0.1",
      "port": 8000,
      "served-model-name": "Qwen/Qwen3-30B-A3B-Instruct-2507"
    },
    "tunable_envs": [
      "VLLM_ATTENTION_BACKEND",
      "CUDA_GRAPH_MAX_BATCH_SIZE"
    ],
    "tunable_flags": [
      "tensor-parallel-size",
      "data-parallel-size",
      "pipeline-parallel-size",
      "max-num-seqs",
      "max-num-batched-tokens",
      "gpu-memory-utilization",
      "enable-prefix-caching",
      "block-size"
    ],
    "python_executable": "python3"
  },
  "trace": {
    "windows_path": "trace_windows/windows.json",
    "window_id": "chat_w_example_peak_0001",
    "u_field": "sampling_u",
    "timestamp_field": "timestamp",
    "max_concurrency": 64
  },
  "slo": {
    "target_pass_rate": 0.95,
    "ttft_rule": {
      "kind": "step_ms",
      "buckets": [
        {
          "max_input_tokens": 4096,
          "threshold_ms": 2000
        },
        {
          "max_input_tokens": 16384,
          "threshold_ms": 4000
        },
        {
          "threshold_ms": 8000
        }
      ]
    },
    "tpot_rule": {
      "kind": "fixed_ms",
      "threshold_ms": 120
    }
  },
  "search": {
    "low": 0.0,
    "high": 1.0,
    "tolerance": 0.01,
    "max_probes": 8,
    "sample_seed": 20260325
  },
  "llm": {
    "system_prompt": "Propose a single engine config patch that increases the maximum feasible sampling_u under the SLO target.",
    "max_history_trials": 8,
    "endpoint": {
      "base_url": "https://example-openai-compatible-endpoint",
      "model": "gpt-4.1-mini",
      "api_key_env": "OPENAI_API_KEY",
      "timeout_s": 120
    }
  },
  "capability_profile_path": "capability.example.json"
}