List knowledge base categories from the kb_category table. Filter by knowledge
AI agents call list_kb_categories to retrieve information from Now Sdk Ext without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists data from the kb_category table without creating, modifying, or deleting records. It is a straightforward read operation with minimal blast radius if misused—at worst, an AI could list categories it shouldn't have visibility to, but no data is changed or executed. Low severity is appropriate for read-only operations on a knowledge base system.
From the tool's definition Tool name 'list_kb_categories' and description 'List knowledge base categories from the kb_category table' indicate a retrieval operation with no data modification or side effects.
Documented attack patterns abuse exactly the kind of access list_kb_categories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Now Sdk Ext, and nothing reaches the server without passing your rules. This is the rule we recommend for list_kb_categories:
{
"version": "1",
"default": "deny",
"tools": {
"list_kb_categories": {}
}
}list_kb_categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List knowledge base categories from the kb_category table. Filter by knowledge. It is categorised as a Read tool in the Now Sdk Ext MCP Server, which means it retrieves data without modifying state.
Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for list_kb_categories: 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 Now Sdk Ext. Nothing to install.
list_kb_categories 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 list_kb_categories 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 list_kb_categories. 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.
list_kb_categories is provided by the Now Sdk Ext MCP server (sonisoft-cnanda/now-sdk-ext-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Now Sdk Ext, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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86 Now Sdk Ext tools catalogued and risk-classified — across an index of 43,000+ MCP servers.