List all available documentation categories.
AI agents call list-categories to retrieve information from CHECK-MODULE MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a straightforward read operation to enumerate documentation categories. It has no side effects, cannot modify data, execute code, or cause harm. The minimal information exposure and non-destructive nature warrant a 'low' severity classification.
From the tool's definition Tool name 'list-categories' and description 'List all available documentation categories' indicate a query operation that retrieves metadata about documentation organization without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access list-categories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CHECK-MODULE MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list-categories:
{
"version": "1",
"default": "deny",
"tools": {
"list-categories": {}
}
}list-categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available documentation categories. It is categorised as a Read tool in the CHECK-MODULE MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CHECK-MODULE MCP Server MCP server in PolicyLayer and add a rule for list-categories: 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 CHECK-MODULE MCP Server. Nothing to install.
list-categories 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 list-categories 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 list-categories. 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.
list-categories is provided by the CHECK-MODULE MCP Server MCP server (muhammedehab35/check-module-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CHECK-MODULE 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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6 CHECK-MODULE MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.