feishu_upload_image · Feishu MCP Server MCP: Risk & Policy

WHAT IT DOES

What feishu_upload_image does on Feishu MCP Server

AI agents use feishu_upload_image to create or update resources in Feishu MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Feishu MCP Server environment.

WHY IT NEEDS A POLICY

Why feishu_upload_image needs a policy

The tool creates new image resources in Feishu's file system. While reversible (images can be deleted), it modifies the state of the platform by adding new files. It is not destructive (does not delete or overwrite), not financial, and not arbitrary code execution.

From the tool's definition Tool name 'feishu_upload_image' and description state it uploads images to Feishu and returns a file_token for insertion. The Chinese text '上传图片到飞书' means 'upload images to Feishu'. This is a create/write operation that stores new media files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

feishu_upload_image Rate-limited

feishu_upload_image stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "feishu_upload_image": {
      "limits": [
        {
          "counter": "feishu_upload_image_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Feishu MCP Server, so you can run agents against it safely.

FAQ

Questions about feishu_upload_image

What does the feishu_upload_image tool do? +

上传图片到飞书。返回 file_token，可用于 feishu_insert_image 插入文档。⚠️ 需要 drive:drive:media:upload 权限。. It is categorised as a Write tool in the Feishu MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on feishu_upload_image? +

Register the Feishu MCP Server MCP server in PolicyLayer and add a rule for feishu_upload_image: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Feishu MCP Server. Nothing to install.

What risk level is feishu_upload_image? +

feishu_upload_image is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit feishu_upload_image? +

Yes. Add a rate_limit block to the feishu_upload_image rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block feishu_upload_image completely? +

Set action: deny in the PolicyLayer policy for feishu_upload_image. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides feishu_upload_image? +

feishu_upload_image is provided by the Feishu MCP Server MCP server (redleaves/feishu-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.