feishu_append_content · Feishu MCP Server MCP: Risk & Policy

WHAT IT DOES

What feishu_append_content does on Feishu MCP Server

AI agents use feishu_append_content 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_append_content needs a policy

This tool creates or modifies data (appends content to documents) in a reversible manner. It does not delete data (Destructive), execute arbitrary code (Execute), or move money (Financial). The medium severity reflects that unintended document modifications could affect collaborative work and information integrity, but changes can be undone.

From the tool's definition Tool name 'feishu_append_content' and description stating it appends content to the end of Feishu documents with Markdown formatting support (titles, lists, code blocks, tables, etc.). The action is reversible modification of document content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

feishu_append_content Rate-limited

feishu_append_content 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_append_content": {
      "limits": [
        {
          "counter": "feishu_append_content_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_append_content

What does the feishu_append_content tool do? +

向飞书文档末尾追加内容。支持 Markdown 格式，包括标题、列表、代码块、表格等。. 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_append_content? +

Register the Feishu MCP Server MCP server in PolicyLayer and add a rule for feishu_append_content: 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_append_content? +

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

Can I rate-limit feishu_append_content? +

Yes. Add a rate_limit block to the feishu_append_content 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_append_content completely? +

Set action: deny in the PolicyLayer policy for feishu_append_content. 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_append_content? +

feishu_append_content 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.