feishu-img-tool（飞书 img 工具）

Feishu Image Tool

Tool feishu_image for uploading and sending images to Feishu chats.

How It Works

Feishu requires a two-step process to send images:

1. Upload Image - Call /open-apis/im/v1/images to upload the image and get image_key
2. Send Message - Call /open-apis/im/v1/messages with msg_type: "image" and the image_key

Actions

Upload and Send Image

{
  "action": "send",
  "target": "ou_xxx",  // User open_id or chat_id
  "file_path": "/path/to/image.png",
  "message": "Optional caption"
}

Parameters:

• action: "send"
• target: Feishu user open_id or chat_id (omit for current conversation)
• file_path: Path to the image file on the server
• message: Optional text message to send with the image

Returns:

• success: boolean
• image_key: The uploaded image key
• message_id: The sent message ID

Upload Image Only

{
  "action": "upload",
  "file_path": "/path/to/image.png"
}

Returns image_key for later use.

Send Image with Key

{
  "action": "send_with_key",
  "target": "ou_xxx",
  "image_key": "img_v3_xxx"
}

Image Limits

• Max size: 10 MB
• Supported formats: JPG, JPEG, PNG, WEBP, GIF, BMP, ICO
• Resolution:

- GIF: max 2000 x 2000 pixels - Other formats: max 12000 x 12000 pixels

Configuration

Feishu App Credentials

Required credentials (in order of priority):

1. Environment variables: FEISHU_APP_ID, FEISHU_APP_SECRET
2. Config file: ~/.feishu-image/config.json

# Method 1: Environment variables
export FEISHU_APP_ID="cli_xxx"
export FEISHU_APP_SECRET="xxx"

# Method 2: Config file (~/.feishu-image/config.json)
{
  "appId": "cli_xxx",
  "appSecret": "xxx"
}

Required Permissions

• im:message - Send messages as bot
• im:image - Upload images

Permissions

• im:message - Send messages as bot
• im:image - Upload images

Example Usage

Send stock chart to user

{
  "action": "send",
  "target": "ou_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "file_path": "/tmp/stock-report.png",
  "message": "📊 今日股票报告"
}

Send to current conversation (omit target)

{
  "action": "send",
  "file_path": "/tmp/chart.png"
}

Implementation Notes

• Uses Feishu SDK @larksuiteoapi/node-sdk
• client.im.image.create() for upload
• client.im.message.create() for sending
• image_key is permanent and can be reused by the same app