List the distinct values currently available across the marketplace catalogue (categories, subcategories, themes, visual styles, biomes, technical tags, types). Use this to suggest concrete filter values to the user when they're undecided.
AI agents call list_marketplace_facets to retrieve information from Portals without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about marketplace facets (categories, subcategories, themes, etc.) to inform user decisions. It performs only data retrieval with no side effects, making it a Read category tool. Severity is low because misuse carries minimal risk—an agent querying marketplace metadata cannot damage systems, corrupt data, or cause financial harm.
From the tool's definition Tool name includes 'list' and description states it 'List[s] the distinct values currently available across the marketplace catalogue' — a pure retrieval operation with no modifications, deletions, or side effects.
Attacks that exploit this kind of access
List the distinct values currently available across the marketplace catalogue (categories, subcategories, themes, visual styles, biomes, technical tags, types). Use this to suggest concrete filter values to the user when they're undecided. It is categorised as a Read tool in the Portals MCP Server, which means it retrieves data without modifying state.
Register the Portals MCP server in PolicyLayer and add a rule for list_marketplace_facets: 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 Portals. Nothing to install.
list_marketplace_facets 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_marketplace_facets 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_marketplace_facets. 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_marketplace_facets is provided by the Portals MCP server (portals-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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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