AI agents use unfollow_user to create or update resources in X(Twitter) V2 MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your X(Twitter) V2 MCP Server environment.
Based on the tool name, it likely removes a follow relationship between the authenticated user and another user. This is a reversible action (you can re-follow), so it falls under Write rather than Destructive. Severity is medium because misuse could affect social relationships/connections at scale. Confidence is reduced due to the empty description.
From the tool's definition Tool name 'unfollow_user'; description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access unfollow_user gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and X(Twitter) V2 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unfollow_user:
{
"version": "1",
"default": "deny",
"tools": {
"unfollow_user": {
"limits": [
{
"counter": "unfollow_user_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unfollow_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.
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unfollow_user. It is categorised as a Write tool in the X(Twitter) V2 MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the X(Twitter) V2 MCP Server MCP server in PolicyLayer and add a rule for unfollow_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 X(Twitter) V2 MCP Server. Nothing to install.
unfollow_user is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the unfollow_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.
Set action: deny in the PolicyLayer policy for unfollow_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.
unfollow_user is provided by the X(Twitter) V2 MCP Server MCP server (nexusx-mcp/x-v2-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from X(Twitter) V2 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 X(Twitter) V2 MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.