AI agents call get_user_inventory 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 user inventory data to retrieve information about previously claimed or purchased assets. It performs no side effects, creates no new data, executes no operations, and cannot delete or modify state. The explicit mention of avoiding duplicates and informing subsequent decisions confirms its read-only nature.
From the tool's definition The tool 'List assets the signed-in user has already claimed or purchased' is purely a retrieval operation.
Attacks that exploit this kind of access
List assets the signed-in user has already claimed or purchased. Useful before claiming new items (avoid duplicates) and for adding owned assets to a room without re-claiming. 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 get_user_inventory: 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.
get_user_inventory 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_user_inventory 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_user_inventory. 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_user_inventory 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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