# app.cosmosis.cluster

> A personally curated group of accounts. Clusters have no fixed size cap: membership is stored as separate `app.cosmosis.clusterMember` records rather than inline, so a Cluster can hold thousands of members. Clusters are always permissioned: each Cluster lives inside its own dedicated Space of type `app.cosmosis.clusterSpace`. Note that the Space's own member list governs *access* to the Cluster and is distinct from the clusterMember records, which are the Cluster's *contents*.

- Kind: record
- Record key: tid
- Authority: cosmosis.app
- Lexicon: 1
- Published by [cosmosis.app](https://lexicon.garden/identity/did:plc:ahyfb4aosesmcpkc34kmc6mo), the NSID's authority

## Links

- [Documentation](https://lexicon.garden/lexicon/did:plc:ahyfb4aosesmcpkc34kmc6mo/app.cosmosis.cluster)
- [Schema JSON](https://lexicon.garden/lexicon/did:plc:ahyfb4aosesmcpkc34kmc6mo/app.cosmosis.cluster/schema.json)
- [Analytics](https://lexicon.garden/lexicon/did:plc:ahyfb4aosesmcpkc34kmc6mo/app.cosmosis.cluster/analytics)

## Record (`app.cosmosis.cluster`)

Type: record · key tid

### Properties

- `createdAt` (string · datetime, required)
- `description` (string)
  - Constraints: maxLength: 300
- `name` (string, required)
  - Constraints: maxLength: 100

## Schema

```json
{
  "$type": "com.atproto.lexicon.schema",
  "defs": {
    "main": {
      "description": "A personally curated group of accounts. Clusters have no fixed size cap: membership is stored as separate `app.cosmosis.clusterMember` records rather than inline, so a Cluster can hold thousands of members. Clusters are always permissioned: each Cluster lives inside its own dedicated Space of type `app.cosmosis.clusterSpace`. Note that the Space's own member list governs *access* to the Cluster and is distinct from the clusterMember records, which are the Cluster's *contents*.",
      "key": "tid",
      "record": {
        "properties": {
          "createdAt": {
            "format": "datetime",
            "type": "string"
          },
          "description": {
            "maxLength": 300,
            "type": "string"
          },
          "name": {
            "maxLength": 100,
            "type": "string"
          }
        },
        "required": [
          "name",
          "createdAt"
        ],
        "type": "object"
      },
      "type": "record"
    }
  },
  "id": "app.cosmosis.cluster",
  "lexicon": 1
}
```