AI agents call find_fields_with_property to retrieve information from Struct without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves field metadata based on property filters. It has no capability to modify, delete, or execute operations — it only searches and returns results. Confidence is high because the description clearly indicates a retrieval operation with no side effects.
From the tool's definition Tool description states it 'Find fields that have a specific property' — this is a search/query operation that retrieves information about fields based on filtering criteria.
Attacks that exploit this kind of access
Find fields that have a specific property. It is categorised as a Read tool in the Struct MCP Server, which means it retrieves data without modifying state.
Register the Struct MCP server in PolicyLayer and add a rule for find_fields_with_property: 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 Struct. Nothing to install.
find_fields_with_property 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 find_fields_with_property 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 find_fields_with_property. 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.
find_fields_with_property is provided by the Struct MCP server (laurears/struct-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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