append_to_list_variable · Code Analysis MCP Server MCP

WHAT IT DOES

What append_to_list_variable does on Code Analysis MCP Server

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

WHY IT NEEDS A POLICY

Why append_to_list_variable needs a policy

This tool modifies a list variable by appending items to it. This is a reversible write operation (items can be removed). The blast radius is low as it only affects an in-memory or stored list variable within the MCP server context, not external systems or files directly.

From the tool's definition '向列表变量添加项' translates to 'Add item to list variable' — appends data to an existing list variable

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_to_list_variable Rate-limited

append_to_list_variable 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": {
    "append_to_list_variable": {
      "limits": [
        {
          "counter": "append_to_list_variable_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 Code Analysis MCP Server, so you can run agents against it safely.

FAQ

Questions about append_to_list_variable

What does the append_to_list_variable tool do? +

向列表变量添加项. It is categorised as a Write tool in the Code Analysis 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 append_to_list_variable? +

Register the Code Analysis MCP Server MCP server in PolicyLayer and add a rule for append_to_list_variable: 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 Code Analysis MCP Server. Nothing to install.

What risk level is append_to_list_variable? +

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

Can I rate-limit append_to_list_variable? +

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

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

append_to_list_variable is provided by the Code Analysis MCP Server MCP server (zeocax/code-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.