AI agents call get_cache_stats to retrieve information from Icon without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns cache statistics, which is a read-only operation with no side effects, no data modification, no code execution, and no destructive or financial implications. The minimal blast radius of misuse (an agent retrieving cache statistics) and informational nature of the output confirm a Read classification with low severity.
From the tool's definition Tool name 'get_cache_stats' and description 'Get cache statistics' indicate retrieval of cache information without modification or side effects.
Documented attack patterns abuse exactly the kind of access get_cache_stats gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Icon, and nothing reaches the server without passing your rules. This is the rule we recommend for get_cache_stats:
{
"version": "1",
"default": "deny",
"tools": {
"get_cache_stats": {}
}
}get_cache_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get cache statistics. It is categorised as a Read tool in the Icon MCP Server, which means it retrieves data without modifying state.
Register the Icon MCP server in PolicyLayer and add a rule for get_cache_stats: 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 Icon. Nothing to install.
get_cache_stats 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_cache_stats 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_cache_stats. 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_cache_stats is provided by the Icon MCP server (liliangshan/mcp-server-icon). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Icon, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Icon tools catalogued and risk-classified — across an index of 43,000+ MCP servers.