follow_user · Agent Twitter Client MCP: Risk & Policy

WHAT IT DOES

What follow_user does on Agent Twitter Client

AI agents use follow_user to create or update resources in Agent Twitter Client — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Agent Twitter Client environment.

WHY IT NEEDS A POLICY

Why follow_user needs a policy

Following a user on Twitter is a reversible social action that modifies account state (adds a follow relationship). It is not destructive, financial, or an arbitrary code execution. It could be misused to mass-follow accounts, causing reputational or spam issues, hence medium severity.

From the tool's definition Follow a Twitter user

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

follow_user Rate-limited

follow_user 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": {
    "follow_user": {
      "limits": [
        {
          "counter": "follow_user_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 Agent Twitter Client, so you can run agents against it safely.

FAQ

Questions about follow_user

What does the follow_user tool do? +

Follow a Twitter user. It is categorised as a Write tool in the Agent Twitter Client MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on follow_user? +

Register the Agent Twitter Client MCP server in PolicyLayer and add a rule for follow_user: 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 Agent Twitter Client. Nothing to install.

What risk level is follow_user? +

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

Can I rate-limit follow_user? +

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

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

follow_user is provided by the Agent Twitter Client MCP server (theo-nash/twitter-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.