schema_find_class

THE RISK

Low Risk

Why schema_find_class needs a policy

This is a deprecated search tool that retrieves schema information without creating, modifying, or deleting data. The use of 'search' and 'find' verbs, combined with the read-only nature of querying class definitions, places it firmly in the Read category. The deprecation status and low impact on system state justify a low severity rating.

From the tool's definition Tool name 'schema_find_class' and description 'Search for classes by partial name or pattern' indicate a query/search operation with no modifications.

Documented attack patterns abuse exactly the kind of access schema_find_class gives an agent:

POLICY

How to control schema_find_class

PolicyLayer is an MCP gateway — it sits between your AI agents and Engineering MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for schema_find_class:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "schema_find_class": {}
  }
}

schema_find_class is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Engineering MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about schema_find_class

What does the schema_find_class tool do? +

[DEPRECATED] Search for classes by partial name or pattern. Use schema_query(operation=. It is categorised as a Read tool in the Engineering MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on schema_find_class? +

Register the Engineering MCP Server MCP server in PolicyLayer and add a rule for schema_find_class: 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 Engineering MCP Server. Nothing to install.

What risk level is schema_find_class? +

schema_find_class is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit schema_find_class? +

Yes. Add a rate_limit block to the schema_find_class 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.

How do I block schema_find_class completely? +

Set action: deny in the PolicyLayer policy for schema_find_class. 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.

What MCP server provides schema_find_class? +

schema_find_class is provided by the Engineering MCP Server MCP server (puran-water/dexpi-sfiles-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Engineering MCP Server tool call.

Start from Engineering 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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