AI agents call get_owned_lists to retrieve information from X(Twitter) V2 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 existing lists owned by the user with no modification, deletion, or external side effects. It is a simple data query operation. Confidence is slightly reduced because the description is empty, but the function name and sibling context strongly indicate read-only behavior.
From the tool's definition Tool name 'get_owned_lists' indicates retrieval of list data belonging to the authenticated user. The verb 'get' and context among sibling tools (get_tweet_by_id, get_tweets_by_userid, get_user_by_username, get_user_mentions) which are all read-only retrieval…
Documented attack patterns abuse exactly the kind of access get_owned_lists 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 get_owned_lists:
{
"version": "1",
"default": "deny",
"tools": {
"get_owned_lists": {}
}
}get_owned_lists is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_owned_lists. It is categorised as a Read tool in the X(Twitter) V2 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the X(Twitter) V2 MCP Server MCP server in PolicyLayer and add a rule for get_owned_lists: 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.
get_owned_lists 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 get_owned_lists 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 get_owned_lists. 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.
get_owned_lists 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.