List Service Portal themes (color palettes, CSS variables)
AI agents call list_portal_themes 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 is a read-only operation that queries and returns existing Service Portal theme information. It retrieves data about visual styling configurations without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an agent could enumerate theme details but cannot alter systems or access sensitive data beyond theme metadata.
From the tool's definition Tool name contains 'list' and description states 'List Service Portal themes'; retrieves theme configuration data (color palettes, CSS variables) with no modification or deletion capability.
Attacks that exploit this kind of access
List Service Portal themes (color palettes, 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 list_portal_themes: 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.
list_portal_themes 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 list_portal_themes 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 list_portal_themes. 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.
list_portal_themes 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.
Every MCP server has a record like this.
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