# 取得頭像上傳 URL

Canonical URL: https://sosoapi.ai/zh-hant/docs/mcp/sign-avatar-upload

`sosoapi_sign_avatar_upload`

取得自己新頭像嘅 signed upload URL；需要 filename 同 content_type。單靠此操作唔會改個人資料。

## Profiles 及連接方式

Profiles: full

Transports: stdio, http

Profile 只影響工具可見性，唔會授權。HTTP 冇本機檔案上傳。SOSOAPI_OUTPUT_SCHEMAS=1 會宣告輸出 schema；兩種模式都會回傳 structured results。

## 權限及改動

MCP annotations 只係發現提示，唔係存取控制保證；仍然有實際登入、角色、資源及能力檢查。

```json
{
  "readOnlyHint": false,
  "destructiveHint": false,
  "idempotentHint": false,
  "openWorldHint": false
}
```

`/identity-api/user/profile/sign-avatar-url` — agent:operate; synchronous_http_response

## 輸入欄位

```json
{
  "type": "object",
  "properties": {
    "filename": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "content_type": {
      "type": "string",
      "pattern": "^image\\/(png|jpeg|jpg|gif|webp)$"
    },
    "byte_size": {
      "description": "Exact avatar size in bytes (max 5 MiB); signed into the upload URL",
      "type": "integer",
      "minimum": 1,
      "maximum": 5242880
    }
  },
  "required": [
    "filename",
    "content_type"
  ],
  "additionalProperties": false
}
```

## 結構化輸出

此 schema 描述成功工具結果嘅 structuredContent。MCP envelope 亦包括 content，失敗可能設定 isError；唔好將文字收據或接受請求當成平台終態。權限及重試規則見對應 API 操作。

```json
{
  "type": "object",
  "properties": {
    "action": {
      "type": "string",
      "const": "sign-avatar-url"
    },
    "path": {
      "type": "string"
    },
    "signed_url": {
      "type": "string",
      "format": "uri"
    },
    "token": {
      "type": "string"
    }
  },
  "required": [
    "action",
    "path",
    "signed_url"
  ],
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false
}
```

## 工具呼叫範例

以下虛構值已按 contract 驗證，唔係真實帳戶 ID、憑證或發佈紀錄。請用已授權範圍回傳嘅 ID、已準備好嘅素材及已審核排程取代，寫入前核對平台資格。此頁唔會呼叫 API。

```json
{
  "name": "sosoapi_sign_avatar_upload",
  "arguments": {
    "filename": "example.png",
    "content_type": "image/png"
  }
}
```

structuredContent

```json
{
  "action": "sign-avatar-url",
  "path": "example",
  "signed_url": "https://example.com/media.png"
}
```

## 對應 API 操作

- [/identity-api/user/profile/sign-avatar-url](https://sosoapi.ai/zh-hant/docs/api/identity-api-user-profile-sign-avatar-url)