mcp_file_update · ShowDoc MCP Server MCP: Risk & Policy

WHAT IT DOES

What mcp_file_update does on ShowDoc MCP Server

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

WHY IT NEEDS A POLICY

Why mcp_file_update needs a policy

This tool creates or modifies file content reversibly. It falls under Write category as it allows updates to files without permanently destroying them. Severity is medium because unintended file modifications could corrupt project code or configuration, but changes can typically be reverted through version control or backups.

From the tool's definition Tool name 'mcp_file_update' and description '更新一个文件的内容' (Update the content of a file) indicate a file modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mcp_file_update Rate-limited

mcp_file_update 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": {
    "mcp_file_update": {
      "limits": [
        {
          "counter": "mcp_file_update_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 ShowDoc MCP Server, so you can run agents against it safely.

FAQ

Questions about mcp_file_update

What does the mcp_file_update tool do? +

更新一个文件的内容。. It is categorised as a Write tool in the ShowDoc 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 mcp_file_update? +

Register the ShowDoc MCP Server MCP server in PolicyLayer and add a rule for mcp_file_update: 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 ShowDoc MCP Server. Nothing to install.

What risk level is mcp_file_update? +

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

Can I rate-limit mcp_file_update? +

Yes. Add a rate_limit block to the mcp_file_update 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 mcp_file_update completely? +

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

mcp_file_update is provided by the ShowDoc MCP Server MCP server (yfcyfc123234/showdoc_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.