chat-image-reader（聊天图像阅读器）

Chat Image Reader

Universal image reading and analysis skill for multiple chat platforms.

Supported Platforms

Required Credentials

This skill requires API credentials to access chat platform messages. Configure at least one platform to use the skill.

Platform Credentials

Configuration Example

# Feishu (飞书) - Required for Feishu image reading
export FEISHU_APP_ID="cli_xxx"
export FEISHU_APP_SECRET="xxx"

# DingTalk (钉钉) - Required for DingTalk image reading
export DINGTALK_APP_KEY="dingxxx"
export DINGTALK_APP_SECRET="xxx"

# WeChat (企业微信) - Required for WeChat image reading
export WECHAT_CORP_ID="xxx"
export WECHAT_CORP_SECRET="xxx"

# Telegram - Required for Telegram image reading
export TELEGRAM_BOT_TOKEN="123456:ABC-xxx"

Security Notes

• Credentials are only used to download images from respective platforms
• No data is sent to external servers except the official platform APIs
• Images are stored temporarily in local temp directory
• Credentials should be configured via environment variables, not hardcoded

Workflow

Step 1: Detect Platform from Context

Check inbound_meta.channel or inbound_meta.provider to determine the chat platform:

{
  "channel": "feishu",      // Feishu
  "channel": "discord",     // Discord
  "channel": "telegram",    // Telegram
  "channel": "whatsapp",    // WhatsApp
  ...
}

Step 2: Get Image by Platform

Feishu (飞书)

1. Get message_id and image_key from message
2. Get tenant access token via API
3. Download from: GET /open-apis/im/v1/messages/{message_id}/resources/{image_key}
4. Save to temp file

DingTalk (钉钉)

1. Get downloadCode from message content
2. Get access token via API (appKey + appSecret)
3. Download from: GET /v1.0/robot/messageFiles/download?downloadCode={code}
4. Save to temp file

WeChat (微信/企业微信)

1. Get media_id from message
2. Get access token via API
3. Download from: GET https://qyapi.weixin.qq.com/cgi-bin/media/get?access_token={token}&media_id={id}
4. Save to temp file

Discord

1. Get attachment URL from message (Discord provides direct CDN URLs)
2. Download directly from URL
3. No authentication needed for public channels

Telegram

1. Get file_id from message
2. Call Bot API: GET https://api.telegram.org/bot{token}/getFile?file_id={file_id}
3. Download from: https://api.telegram.org/file/bot{token}/{file_path}

WhatsApp / Signal / Slack

1. Get media URL from message
2. Download directly (usually with token in header)

Local File Path

If user provides a local path directly:

1. Verify file exists
2. Use directly without download

Step 3: Analyze Image

Use the image tool with appropriate prompt:

image(
  image: "<local_path_or_url>",
  prompt: "描述图片内容，包括文字、图表、数据等关键信息"
)

Platform-Specific Implementation

Feishu Implementation

# 1. Get tenant token
$body = @{ app_id = $appId; app_secret = $appSecret } | ConvertTo-Json
$token = (Invoke-RestMethod -Uri "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal" -Method Post -Body $body).tenant_access_token

# 2. Get message to find image_key
$message = Invoke-RestMethod -Uri "https://open.feishu.cn/open-apis/im/v1/messages/$messageId" -Headers @{ Authorization = "Bearer $token" }
$imageKey = $message.data.items[0].body.content | ConvertFrom-Json | Select-Object -ExpandProperty image_key

# 3. Download image
Invoke-WebRequest -Uri "https://open.feishu.cn/open-apis/im/v1/messages/$messageId/resources/$imageKey" -Headers @{ Authorization = "Bearer $token" } -OutFile $outputPath

DingTalk Implementation

# 1. Get access token
$body = @{ appKey = $appKey; appSecret = $appSecret } | ConvertTo-Json
$token = (Invoke-RestMethod -Uri "https://api.dingtalk.com/v1.0/oauth2/accessToken" -Method Post -Body $body).accessToken

# 2. Download image using downloadCode
# For robot messages:
Invoke-WebRequest -Uri "https://api.dingtalk.com/v1.0/robot/messageFiles/download?downloadCode=$downloadCode" -Headers @{ "x-acs-dingtalk-access-token" = $token } -OutFile $outputPath

# For user messages (via stream):
# Use conversation message download API

WeChat (企业微信) Implementation

# 1. Get access token
$token = (Invoke-RestMethod -Uri "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$corpId&corpsecret=$corpSecret").access_token

# 2. Download media
Invoke-WebRequest -Uri "https://qyapi.weixin.qq.com/cgi-bin/media/get?access_token=$token&media_id=$mediaId" -OutFile $outputPath

Discord Implementation

# Discord attachments are direct URLs
$attachmentUrl = $message.attachments[0].url
Invoke-WebRequest -Uri $attachmentUrl -OutFile $outputPath

Telegram Implementation

# 1. Get file path from file_id
$fileInfo = Invoke-RestMethod -Uri "https://api.telegram.org/bot$token/getFile?file_id=$fileId"
$filePath = $fileInfo.result.file_path

# 2. Download file
Invoke-WebRequest -Uri "https://api.telegram.org/file/bot$token/$filePath" -OutFile $outputPath

Reply Context Handling

When user replies to an image message:

1. Check reply_to_id in inbound metadata
2. Fetch the original message using platform-specific API
3. Extract image from the original message
4. Proceed with download and analysis

Common Analysis Prompts

Document/Screenshot

识别图片中的所有文字内容，保持原有格式和层次结构。

Chart/Table

分析图片中的图表或表格，提取所有数据和标签。

UI Screenshot

描述界面布局、功能按钮、当前状态等关键信息。

Stock/Finance Chart

识别股票代码、价格、K线形态、成交量等财务信息。

Job Posting

提取招聘信息，包括职位名称、职责、要求、薪资等关键内容。

General Image

描述图片内容，包括主要元素、文字、数据等关键信息。

Error Handling

Fallback Strategy

When automatic image retrieval fails:

1. Ask user to provide path: "请提供图片的本地路径"
2. Ask user to describe: "请描述图片内容或复制图片中的文字"
3. Request resend: "请重新发送图片"

Temp File Management

• Save images to $workspace/temp_images/ or system temp
• Clean up after analysis (optional, for disk space)
• Use unique filenames with timestamp: img_{channel}_{timestamp}.jpg

Configuration Required

Feishu (飞书)

• FEISHU_APP_ID / channels.feishu.appId
• FEISHU_APP_SECRET / channels.feishu.appSecret
• Required scope: im:message:readonly, im:resource

DingTalk (钉钉)

• DINGTALK_APP_KEY / channels.dingtalk.appKey
• DINGTALK_APP_SECRET / channels.dingtalk.appSecret
• Required permissions: IMessage, Chat

WeChat (企业微信)

• WECHAT_CORP_ID / channels.wechat.corpId
• WECHAT_CORP_SECRET / channels.wechat.corpSecret
• Required permissions: media_get

Telegram

• Bot token configured in OpenClaw

Discord

• Bot token configured in OpenClaw

Notes

• Most platforms provide images in JPG/PNG format
• Large images may need resizing before analysis
• Consider rate limits for API calls
• Always validate user has permission to access the image