Get full details of a Service Portal theme including CSS variables
AI agents call get_portal_theme to retrieve information from ServiceNow-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves theme configuration data (CSS variables and portal theme details) without any side effects or ability to modify state. It is a pure query operation returning existing theme information. The blast radius of misuse is minimal—an adversary could only learn about theme styling, which is typically not sensitive information in ServiceNow environments.
From the tool's definition The tool name 'get_portal_theme' combined with the description 'Get full details of a Service Portal theme including CSS variables' indicates data retrieval of theme configuration.
Attacks that exploit this kind of access
Get full details of a Service Portal theme including CSS variables. It is categorised as a Read tool in the ServiceNow-MCP MCP Server, which means it retrieves data without modifying state.
Register the ServiceNow- MCP server in PolicyLayer and add a rule for get_portal_theme: 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.
get_portal_theme 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 get_portal_theme 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 get_portal_theme. 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.
get_portal_theme 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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