AI agents call get_user_by_id to retrieve information from OpenCTI 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 user information from OpenCTI based on a provided ID. It performs a simple query operation with no side effects—no data is created, modified, deleted, or executed. The context of sibling tools (get_campaign_by_name, get_file_by_id, get_report_by_id, list_*) confirms this server primarily offers read-only intelligence queries.
From the tool's definition Tool name 'get_user_by_id' and description indicating retrieval of user information by ID. No modification, deletion, or execution capabilities indicated.
Documented attack patterns abuse exactly the kind of access get_user_by_id gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OpenCTI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_user_by_id:
{
"version": "1",
"default": "deny",
"tools": {
"get_user_by_id": {}
}
}get_user_by_id 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.
根據ID獲取使用者資訊. It is categorised as a Read tool in the OpenCTI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenCTI MCP Server MCP server in PolicyLayer and add a rule for get_user_by_id: 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 OpenCTI MCP Server. Nothing to install.
get_user_by_id 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_user_by_id 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_user_by_id. 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_user_by_id is provided by the OpenCTI MCP Server MCP server (zxzinn/opencti-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 OpenCTI MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
16 OpenCTI MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.