AI agents call getUserMentions to retrieve information from X Com MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries existing posts mentioning a user. It does not create, modify, delete, or execute operations—it purely reads data from X.com. The blast radius of misuse is minimal; an agent could retrieve unwanted mention data but cannot alter state or cause irreversible harm.
From the tool's definition Tool name 'getUserMentions' and description 'Get posts that mention a specific user' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access getUserMentions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and X Com MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for getUserMentions:
{
"version": "1",
"default": "deny",
"tools": {
"getUserMentions": {}
}
}getUserMentions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get posts that mention a specific user. It is categorised as a Read tool in the X Com MCP Server MCP Server, which means it retrieves data without modifying state.
Register the X Com MCP Server MCP server in PolicyLayer and add a rule for getUserMentions: 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 Com MCP Server. Nothing to install.
getUserMentions is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getUserMentions 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 getUserMentions. 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.
getUserMentions is provided by the X Com MCP Server MCP server (tiovikram/x.com-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from X Com MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
21 X Com MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.