> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rotastellar.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Plan Constellation DAG

> Generates an optimized execution plan (DAG) for a satellite constellation workload

<Note>
  **Base URL:** `https://rotastellar-cae.subhadip-mitra.workers.dev`
  — No API key required. CORS-validated.
</Note>

<RequestExample>
  ```bash theme={null}
  curl -X POST https://rotastellar-cae.subhadip-mitra.workers.dev/v1/constellation/plan \
    -H "Content-Type: application/json" \
    -H "Origin: https://rotastellar.com" \
    -d '{
      "fleet": [
        {
          "norad_id": "99901",
          "name": "RS-LEO-1",
          "role": "compute",
          "orbit": { "altitude_km": 550, "inclination_deg": 53 }
        },
        {
          "norad_id": "99902",
          "name": "RS-LEO-2",
          "role": "compute",
          "orbit": { "altitude_km": 550, "inclination_deg": 53 }
        },
        {
          "norad_id": "99903",
          "name": "RS-LEO-3",
          "role": "aggregator",
          "orbit": { "altitude_km": 550, "inclination_deg": 53 }
        }
      ],
      "preset_id": "split-learning"
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 OK theme={null}
  {
    "plan_id": "plan_cst_7f3a1b",
    "preset_id": "split-learning",
    "metrics": {
      "critical_path_s": 342,
      "satellites_used": 3,
      "isl_transfers": 4,
      "reliability": 0.973
    },
    "steps": [
      {
        "step": 1,
        "satellite": "RS-LEO-1",
        "task": "forward_pass_split",
        "duration_s": 45,
        "depends_on": []
      },
      {
        "step": 2,
        "satellite": "RS-LEO-2",
        "task": "forward_pass_split",
        "duration_s": 45,
        "depends_on": []
      },
      {
        "step": 3,
        "satellite": "RS-LEO-3",
        "task": "aggregate_activations",
        "duration_s": 30,
        "depends_on": [1, 2],
        "isl_route": ["RS-LEO-1 → RS-LEO-3", "RS-LEO-2 → RS-LEO-3"]
      }
    ],
    "isl_routing": [
      { "from": "RS-LEO-1", "to": "RS-LEO-3", "latency_ms": 12, "bandwidth_mbps": 100 },
      { "from": "RS-LEO-2", "to": "RS-LEO-3", "latency_ms": 14, "bandwidth_mbps": 100 }
    ]
  }
  ```
</ResponseExample>