get_knowledge_base

THE RISK

Low Risk

Why get_knowledge_base needs a policy

This tool retrieves information about a knowledge base using a unique identifier (sys_id). It performs a query operation with no side effects, no code execution, no data modification, and no deletion. The tool is purely informational and falls clearly into the Read category. The low severity reflects that retrieving knowledge base metadata poses minimal risk even if misused by an AI agent.

From the tool's definition Tool name is 'get_knowledge_base' and description states 'Get details of a specific knowledge base by sys_id, including the total number'. The verb 'Get' and the retrieval nature indicate data retrieval without modification.

Documented attack patterns abuse exactly the kind of access get_knowledge_base gives an agent:

POLICY

How to control get_knowledge_base

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 get_knowledge_base:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_knowledge_base": {}
  }
}

get_knowledge_base is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Now Sdk Ext — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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All 86 Now Sdk Ext tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_knowledge_base

What does the get_knowledge_base tool do? +

Get details of a specific knowledge base by sys_id, including the total number. It is categorised as a Read tool in the Now Sdk Ext MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_knowledge_base? +

Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for get_knowledge_base: 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.

What risk level is get_knowledge_base? +

get_knowledge_base is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_knowledge_base? +

Yes. Add a rate_limit block to the get_knowledge_base 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.

How do I block get_knowledge_base completely? +

Set action: deny in the PolicyLayer policy for get_knowledge_base. 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.

What MCP server provides get_knowledge_base? +

get_knowledge_base 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.

Enforce policy on every Now Sdk Ext tool call.

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.

CHECK YOUR STACK →