Creates a UI Policy Action that controls the state of a catalog variable.
AI agents use create_ui_policy_action to create or update resources in Snow — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Snow environment.
This tool creates new configuration objects (UI Policy Actions) in ServiceNow's service catalog system. While the effects are reversible (policies can be modified or deleted later), the action modifies the system's data and behavior.
From the tool's definition Tool description states it 'Creates a UI Policy Action' — the verb 'Creates' indicates data creation. UI Policy Actions are configuration objects in ServiceNow that modify catalog form behavior; creating them modifies the service catalog's state reversibly.
Documented attack patterns abuse exactly the kind of access create_ui_policy_action gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Snow, and nothing reaches the server without passing your rules. This is the rule we recommend for create_ui_policy_action:
{
"version": "1",
"default": "deny",
"tools": {
"create_ui_policy_action": {
"limits": [
{
"counter": "create_ui_policy_action_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_ui_policy_action stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Creates a UI Policy Action that controls the state of a catalog variable. It is categorised as a Write tool in the Snow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Snow MCP server in PolicyLayer and add a rule for create_ui_policy_action: 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 Snow. Nothing to install.
create_ui_policy_action is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_ui_policy_action 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 create_ui_policy_action. 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.
create_ui_policy_action is provided by the Snow MCP server (shunyaai/snow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Snow, 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.
88 Snow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.