# set_chapter_members

Replace the ordered member list of a chapter.

`PUT /v1/chapters/{collectionId}/members` · MCP tool `set_chapter_members` · scope `write` · stable · since 2026-09-17

Send the complete desired list in order: [{ spotKey }] entries, or [{ memberCollectionId }] entries to place chapters as cards inside a plain collection. Members not in the list are removed. Atomic.

## Path parameters

- `collectionId` (string, required): Id of the chapter or collection.

## Body parameters

- `members` (array of objects, required): Ordered list of { spotKey } or { memberCollectionId } objects, at most 500.
  - `spotKey` (string, optional): A spot of this guide (spotKey from list_spots), listed once. Each entry names exactly one of spotKey or memberCollectionId.
  - `memberCollectionId` (string, optional): A chapter of this guide (kind chapter) shown as a card, listed once. Only a plain collection can hold chapters.

## Returns

200.

- `ok` (boolean, required): Always true: the write went through. Always `true`.
- `collectionId` (string, required): The chapter's or collection's id.
- `members` (number, required): How many members the chapter now has.

## Examples

### Set a chapter's spots in order

```bash
curl -X PUT "https://sceniq.earth/api/v1/chapters/kn73r7x6mp88mxa9swcbshwd3e7zvr39/members" \
  -H "Authorization: Bearer $SCENIQ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "members": [
    {
      "spotKey": "01M2Z1G0Y0R2K5P8S1V4X7Z0C3"
    },
    {
      "spotKey": "01M3H2AWH0F9PB64V7QB8QS0MC"
    },
    {
      "spotKey": "01M3H2AXG8GB8YNF4FCEFARFN5"
    },
    {
      "spotKey": "01M3KMNRY0V8ZPTG4HCY75DZFB"
    },
    {
      "spotKey": "01M3H2AYFG8169CVH0JCQY2BN2"
    }
  ]
}'
```

MCP `tools/call`:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "set_chapter_members",
    "arguments": {
      "collectionId": "kn73r7x6mp88mxa9swcbshwd3e7zvr39",
      "members": [
        {
          "spotKey": "01M2Z1G0Y0R2K5P8S1V4X7Z0C3"
        },
        {
          "spotKey": "01M3H2AWH0F9PB64V7QB8QS0MC"
        },
        {
          "spotKey": "01M3H2AXG8GB8YNF4FCEFARFN5"
        },
        {
          "spotKey": "01M3KMNRY0V8ZPTG4HCY75DZFB"
        },
        {
          "spotKey": "01M3H2AYFG8169CVH0JCQY2BN2"
        }
      ]
    }
  }
}
```

Response 200:

```json
{
  "ok": true,
  "collectionId": "kn73r7x6mp88mxa9swcbshwd3e7zvr39",
  "members": 5
}
```

### Place chapters as cards inside a collection

```bash
curl -X PUT "https://sceniq.earth/api/v1/chapters/kn7hh1xv41qmtn8mk9n7g2wc7qfrfpte/members" \
  -H "Authorization: Bearer $SCENIQ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "members": [
    {
      "memberCollectionId": "kn7e5r9t3y7v1j5p9p3a7s1d5f9g3h7j"
    },
    {
      "memberCollectionId": "kn73r7x6mp88mxa9swcbshwd3e7zvr39"
    }
  ]
}'
```

MCP `tools/call`:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "set_chapter_members",
    "arguments": {
      "collectionId": "kn7hh1xv41qmtn8mk9n7g2wc7qfrfpte",
      "members": [
        {
          "memberCollectionId": "kn7e5r9t3y7v1j5p9p3a7s1d5f9g3h7j"
        },
        {
          "memberCollectionId": "kn73r7x6mp88mxa9swcbshwd3e7zvr39"
        }
      ]
    }
  }
}
```

Response 200:

```json
{
  "ok": true,
  "collectionId": "kn7hh1xv41qmtn8mk9n7g2wc7qfrfpte",
  "members": 2
}
```

## Errors

- `invalid_argument` (400): A required field is missing, a field is unknown, or a value does not match its type (the Convex validator's path and value are in the message).
- `invalid_request` (400): A writer refused a value: a map link on a host that is not allowed, a title that is too long, a date that does not exist, too many items in a list. The message is the writer's own sentence.
- `unauthenticated` (401): The request carries no key. Send it as Authorization: Bearer sk_sceniq_... (or X-Api-Key).
- `invalid_api_key` (401): The key is unknown, revoked or expired.
- `api_scope_required` (403): A read-only key called a write operation, or a key without the publish option called publish_changes.
- `forbidden` (403): The key belongs to a creator account that is no longer active.
- `not_found` (404): The id does not exist or belongs to another creator. The two answers are identical on purpose, so ids never reveal what exists.
- `payload_too_large` (413): A JSON body over 2 MB, an image over 6 MB, a batch upload over 19 MB, or an MCP message over 2 MB.
- `rate_limited` (429): Over a limit: requests per key per minute, per creator per hour, uploads per key per minute, or check_links per guide per hour.
- `internal_error` (500): An unexpected failure. The message is hidden on purpose.

Reference: https://developers.sceniq.earth/reference/set_chapter_members