get_cmdb_relationships

THE RISK

Low Risk

Why get_cmdb_relationships needs a policy

This tool retrieves relationship data from the ServiceNow CMDB (Configuration Management Database), which is a pure read operation. It queries and returns information about CI relationships with no side effects, no code execution, no data modification, and no destructive actions.

From the tool's definition Tool name 'get_cmdb_relationships' and description 'Get direct relationships of a CMDB Configuration Item (CI). Returns upstream' indicate a retrieval operation that queries existing configuration data without modifying, deleting, or executing operations.

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

POLICY

How to control get_cmdb_relationships

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_cmdb_relationships:

policy.json

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

get_cmdb_relationships 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.

CAP THIS TOOL →

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EXPLORE

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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_cmdb_relationships

What does the get_cmdb_relationships tool do? +

Get direct relationships of a CMDB Configuration Item (CI). Returns upstream,. 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_cmdb_relationships? +

Register the Now Sdk Ext MCP server in PolicyLayer and add a rule for get_cmdb_relationships: 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_cmdb_relationships? +

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

Can I rate-limit get_cmdb_relationships? +

Yes. Add a rate_limit block to the get_cmdb_relationships 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_cmdb_relationships completely? +

Set action: deny in the PolicyLayer policy for get_cmdb_relationships. 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_cmdb_relationships? +

get_cmdb_relationships 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 →