AI agents call get_class_info to retrieve information from JVM 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 and displays information about Java classes (metadata, structure, fields, methods) without modifying, executing, or deleting anything. It is a passive diagnostic operation typical of JVM monitoring platforms like Arthas, with no side effects beyond returning data to the requestor.
From the tool's definition Tool name 'get_class_info' with description 'Get detailed class information including structure' indicates retrieval of class metadata.
Documented attack patterns abuse exactly the kind of access get_class_info gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and JVM MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_class_info:
{
"version": "1",
"default": "deny",
"tools": {
"get_class_info": {}
}
}get_class_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get detailed class information including structure. It is categorised as a Read tool in the JVM MCP Server MCP Server, which means it retrieves data without modifying state.
Register the JVM MCP Server MCP server in PolicyLayer and add a rule for get_class_info: 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 JVM MCP Server. Nothing to install.
get_class_info 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_class_info 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_class_info. 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_class_info is provided by the JVM MCP Server MCP server (xzq-xu/jvm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 JVM MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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15 JVM MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.