Look up CPC classification code details.
AI agents call patentsview_lookup_cpc to retrieve information from USPTO Patent MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries classification code metadata without modifying, executing operations, or affecting system state. It fits the Read category as a lookup/fetch operation. Severity is low because exposure would only allow an AI to access public patent classification reference data, with no destructive or operationally risky side effects.
From the tool's definition Tool name 'patentsview_lookup_cpc' combined with description 'Look up CPC classification code details' indicates a simple data retrieval operation.
Documented attack patterns abuse exactly the kind of access patentsview_lookup_cpc gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and USPTO Patent MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for patentsview_lookup_cpc:
{
"version": "1",
"default": "deny",
"tools": {
"patentsview_lookup_cpc": {}
}
}patentsview_lookup_cpc is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up CPC classification code details. It is categorised as a Read tool in the USPTO Patent MCP Server MCP Server, which means it retrieves data without modifying state.
Register the USPTO Patent MCP Server MCP server in PolicyLayer and add a rule for patentsview_lookup_cpc: 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 USPTO Patent MCP Server. Nothing to install.
patentsview_lookup_cpc 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 patentsview_lookup_cpc 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 patentsview_lookup_cpc. 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.
patentsview_lookup_cpc is provided by the USPTO Patent MCP Server MCP server (riemannzeta/patent_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 61 USPTO Patent MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
61 USPTO Patent MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.