# MCP Multi-Chart Context

`POST https://api.astroway.info/v1/mcp/multi-chart-context`

Compact context for MCP agents working across multiple charts.

Group: AI & MCP. Auth: `X-Api-Key` header. Operation ID: `mcp_multi-chart-context`.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `fields` | query | no | string | Comma-separated dotted paths, relative to `data`, to keep in the response. A path is applied to every element of an array, so `planets.name` means the name of each planet. Paths that match nothing come back in `_fields_unmatched`; a list where nothing matches at all is a 400, because an empty object would be a confident wrong answer. |
| `precision` | query | no | integer | Round every non-integer number in the response to this many decimal places. Integers are left alone, because an id is not a measurement. Ecliptic longitudes ship with fourteen decimals by default; 2 is about a tenth of an arcminute. |

## Request body

| Field | Type | Required | Description |
|---|---|---|---|
| `inputs` | ChartInput[] | yes |  |

```json
{
  "charts": [
    {
      "date": "1990-05-15",
      "time": "15:30:00",
      "timezone": "Europe/Kyiv",
      "latitude": 50.45,
      "longitude": 30.52
    },
    {
      "date": "1990-05-15",
      "time": "15:30:00",
      "timezone": "Europe/Kyiv",
      "latitude": 50.45,
      "longitude": 30.52
    }
  ]
}
```

## Responses

| Status | Meaning |
|---|---|
| 200 | Successful calculation |
| 400 | Validation error |
| 401 | Missing or invalid API key |

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `contextHash` | string | no |  |
| `chartCount` | number | no |  |
| `intent` | string | no |  |
| `summaries` | object[] | no |  |
| `summaryString` | string | no |  |
| `notes` | string[] | no |  |

## Example

```bash
curl -X POST https://api.astroway.info/v1/mcp/multi-chart-context \
  -H "X-Api-Key: aw_live_..." \
  -H "Content-Type: application/json" \
  -d '{ "charts": [ { "date": "1990-05-15", "time": "15:30:00", "timezone": "Europe/Kyiv", "latitude": 50.45, "longitude": 30.52 }, { "date": "1990-05-15", "time": "15:30:00", "timezone": "Europe/Kyiv", "latitude": 50.45, "longitude": 30.52 } ] }'
```

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