{
  "name": "sessions_stop",
  "description": "Stop / cancel an in-flight generation for a session (idempotent).",
  "input_schema": {
    "type": "object",
    "properties": {
      "sessionId": {
        "type": "string"
      }
    },
    "required": [
      "sessionId"
    ]
  },
  "timeout": 30
}