Search CSF subcategories by keyword or function
AI agents call search_csf_subcategories to retrieve information from NIST MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries NIST Cybersecurity Framework (CSF) subcategories using keyword or function filters. It retrieves information without creating, modifying, executing operations, or deleting data. The search operation is a read-only query against a static knowledge base of security controls. Misuse would result in only information disclosure, making it low risk.
From the tool's definition Tool name contains 'search' and description states 'Search CSF subcategories by keyword or function' — both indicate data retrieval with no modification or execution.
Documented attack patterns abuse exactly the kind of access search_csf_subcategories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NIST MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_csf_subcategories:
{
"version": "1",
"default": "deny",
"tools": {
"search_csf_subcategories": {}
}
}search_csf_subcategories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search CSF subcategories by keyword or function. It is categorised as a Read tool in the NIST MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NIST MCP Server MCP server in PolicyLayer and add a rule for search_csf_subcategories: 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 NIST MCP Server. Nothing to install.
search_csf_subcategories 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 search_csf_subcategories 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 search_csf_subcategories. 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.
search_csf_subcategories is provided by the NIST MCP Server MCP server (tnicholson/nist-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from NIST 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.
44 NIST MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.