{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "ThinkingBlockParam",
  "type": "object",
  "description": "A thinking content block in a request (for multi-turn with extended thinking).",
  "properties": {
    "type": {
      "type": "string"
    },
    "thinking": {
      "type": "string",
      "description": "The thinking text from a previous response."
    },
    "signature": {
      "type": "string",
      "description": "The signature from the previous thinking block."
    }
  }
}