AI agents call get_bookmarks to retrieve information from X (Twitter) 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 bookmark data for the authenticated user, which is a read-only query operation. It fetches existing data without creating, modifying, or deleting anything. No side effects or external operations are triggered. The low severity reflects minimal risk—exposure would only allow viewing of the user's bookmarked tweets.
From the tool's definition Tool name 'get_bookmarks' and description 'Retrieves the authenticated user' indicate a data retrieval operation with no modification or destructive capability.
Documented attack patterns abuse exactly the kind of access get_bookmarks gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and X (Twitter) MCP server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_bookmarks:
{
"version": "1",
"default": "deny",
"tools": {
"get_bookmarks": {}
}
}get_bookmarks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieves the authenticated user. It is categorised as a Read tool in the X (Twitter) MCP server MCP Server, which means it retrieves data without modifying state.
Register the X (Twitter) MCP server MCP server in PolicyLayer and add a rule for get_bookmarks: 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) MCP server. Nothing to install.
get_bookmarks 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_bookmarks 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_bookmarks. 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_bookmarks is provided by the X (Twitter) MCP server MCP server (rafaljanicki/x-twitter-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 X (Twitter) MCP server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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24 X (Twitter) MCP server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.