{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "v": {
      "type": "number",
      "const": 1,
      "description": "Protocol major version."
    },
    "type": {
      "type": "string",
      "const": "membership.added"
    },
    "id": {
      "type": "string",
      "pattern": "^evt_[0-7][0-9A-HJKMNP-TV-Z]{25}$",
      "description": "The event's own id. Stable across a retry of the same event."
    },
    "ts": {
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
      "description": "When it happened, by Chips' clock. Stamped on the way in; a value the sender writes is replaced."
    },
    "workspace_id": {
      "type": "string",
      "pattern": "^ws_[0-7][0-9A-HJKMNP-TV-Z]{25}$",
      "description": "A workspace identifier: `ws_` followed by a ULID."
    },
    "space_id": {
      "description": "The space, when the event belongs to one.",
      "type": "string",
      "pattern": "^spc_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    },
    "run_id": {
      "description": "The run, when the event belongs to one.",
      "type": "string",
      "pattern": "^run_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    },
    "seq": {
      "description": "Assigned by the server on append, monotonic per workspace. Absent on the way in.",
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 9007199254740991
    },
    "idempotency_key": {
      "description": "Required on every client-originated write. Sending the same key twice is a no-op.",
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "actor": {
      "type": "object",
      "properties": {
        "kind": {
          "type": "string",
          "enum": [
            "person",
            "harness",
            "agent",
            "system"
          ],
          "description": "Whether a person, a harness, one of a harness's agents or Chips itself acted."
        },
        "id": {
          "type": "string",
          "minLength": 1,
          "description": "The participant id, or `system` for Chips."
        },
        "harness_id": {
          "description": "For an agent: the harness it speaks through, whose budget and runs are the agent's (ADR 0087). Filled in by Chips.",
          "type": "string",
          "pattern": "^hrn_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
        }
      },
      "required": [
        "kind",
        "id"
      ],
      "description": "The participant an event is attributed to."
    },
    "participant_id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 120,
      "description": "Who joined."
    },
    "participant_kind": {
      "type": "string",
      "enum": [
        "person",
        "harness",
        "agent"
      ],
      "description": "A person or an agent (ADR 0087); `harness` for a harness in a room before the upgrade gave it an agent."
    },
    "role": {
      "default": "member",
      "description": "Their standing here, which is what every `from` field reports.",
      "type": "string",
      "enum": [
        "owner",
        "member",
        "guest"
      ]
    },
    "joined_at": {
      "description": "Defaults to the event's own timestamp.",
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
    },
    "moved_from": {
      "description": "For an agent moved here from another room (ADR 0087): the room it left. Written by Chips.",
      "type": "string",
      "pattern": "^spc_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    },
    "fork_of": {
      "description": "For a fork's copy (ADR 0087, Fork): the `agent.fork` it answers, so the room shows the copy joining on the line that asked for it. Written by Chips.",
      "type": "string",
      "pattern": "^evt_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    },
    "made_for": {
      "description": "For a new agent a person asked a harness for (ADR 0108): the `agent.asked` it answers, so the room shows it joining on the line that asked for it. Written by Chips.",
      "type": "string",
      "pattern": "^evt_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    },
    "agent_name": {
      "description": "For a harness asked for this room from the + (ADR 0150): the first name its agent will have here, held for it until it claims the room or answers in it, and the name the room calls it by meanwhile. A person's device may propose one; Chips keeps it when nobody has it and picks one off its list otherwise.",
      "type": "string",
      "minLength": 1,
      "maxLength": 40
    },
    "invite_id": {
      "description": "For a person who came in by a space's invite link (ADR 0168): the link, so the room says they joined by it. The actor is whoever made the link, who put them here. Written by Chips.",
      "type": "string",
      "pattern": "^inv_[0-7][0-9A-HJKMNP-TV-Z]{25}$"
    }
  },
  "required": [
    "v",
    "type",
    "id",
    "ts",
    "workspace_id",
    "actor",
    "participant_id",
    "participant_kind"
  ],
  "description": "A person or an agent joined a space. Shows as a muted centred line.",
  "$id": "https://chipschat.ai/schema/v1/membership.added.json",
  "title": "MembershipAdded"
}