AI agents call get_available_fields to retrieve information from USPTO Patent Citation 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 metadata about available fields in the USPTO citation API—a non-destructive, read-only operation. No side effects, no data modification, no financial impact. Confidence is moderately high despite missing description, as the name and server context strongly indicate a simple metadata query. Severity is low because field enumeration poses minimal risk even if misused.
From the tool's definition Tool name 'get_available_fields' indicates retrieval of schema or metadata information. Description is empty, but context from sibling tools (all search/get/validate operations) and the server's purpose (patent citation analysis with 'progressive disclosure…
Documented attack patterns abuse exactly the kind of access get_available_fields gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and USPTO Patent Citation MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_available_fields:
{
"version": "1",
"default": "deny",
"tools": {
"get_available_fields": {}
}
}get_available_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_available_fields. It is categorised as a Read tool in the USPTO Patent Citation MCP Server MCP Server, which means it retrieves data without modifying state.
Register the USPTO Patent Citation MCP Server MCP server in PolicyLayer and add a rule for get_available_fields: 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 Citation MCP Server. Nothing to install.
get_available_fields 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_available_fields 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_available_fields. 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_available_fields is provided by the USPTO Patent Citation MCP Server MCP server (john-walkoe/uspto_enriched_citation_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from USPTO Patent Citation MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 USPTO Patent Citation MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.