add_list_member · Apex MCP for X Management MCP

WHAT IT DOES

What add_list_member does on Apex MCP for X Management

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

WHY IT NEEDS A POLICY

Why add_list_member needs a policy

This tool creates or modifies data in a reversible manner—adding a list member is a standard write operation. It does not execute arbitrary code, delete data irreversibly, move money, or retrieve data without side effects.

From the tool's definition Tool name 'add_list_member' and description 'Add a member to an X/Twitter list' indicate creation/modification of list membership data. This is a write operation that modifies the state of a list by adding a member.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_list_member Rate-limited

add_list_member 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": {
    "add_list_member": {
      "limits": [
        {
          "counter": "add_list_member_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 Apex MCP for X Management, so you can run agents against it safely.

FAQ

Questions about add_list_member

What does the add_list_member tool do? +

Add a member to an X/Twitter list. It is categorised as a Write tool in the Apex MCP for X Management MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_list_member? +

Register the Apex MCP for X Management MCP server in PolicyLayer and add a rule for add_list_member: 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 Apex MCP for X Management. Nothing to install.

What risk level is add_list_member? +

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

Can I rate-limit add_list_member? +

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

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

add_list_member is provided by the Apex MCP for X Management MCP server (xonack/apex-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.