preview_update_set

Preview all changes contained in an Update Set

SERVERServiceNow-MCP SOURCEtedorigawa001/servicenow-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/tedorigawa001-servicenow-mcp/preview-update-set.md

WHAT IT DOES

What preview_update_set does on ServiceNow-MCP

AI agents call preview_update_set to retrieve information from ServiceNow-MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why preview_update_set is rated Low

Previewing an update set is a read-only operation that shows what would change if the update set were committed/applied. It does not modify, execute, or apply any changes. This is analogous to a diff or dry-run operation.

From the tool's definition 'Preview all changes contained in an Update Set' — reads and displays what changes are in the update set without applying them

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs preview_update_set safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ServiceNow-MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For preview_update_set, this is the rule to start with:

preview_update_set Allowed

preview_update_set is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ServiceNow-MCP, apply this rule, and every preview_update_set call is checked against it from then on.

FAQ

Questions about preview_update_set

What does the preview_update_set tool do? +

Preview all changes contained in an Update Set. It is categorised as a Read tool in the ServiceNow-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on preview_update_set? +

Register the ServiceNow MCP server in PolicyLayer and add a rule for preview_update_set: 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 ServiceNow-MCP. Nothing to install.

What risk level is preview_update_set? +

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

Can I rate-limit preview_update_set? +

Yes. Add a rate_limit block to the preview_update_set 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 preview_update_set completely? +

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

preview_update_set is provided by the ServiceNow MCP server (tedorigawa001/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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