get_jstat_output

THE RISK

High Risk

jstat is a JDK monitoring command that is executed externally. While jstat is primarily read-only/observational (garbage collection stats, memory usage), the tool's action is to execute an external command, placing it in the Execute category. Misuse risk is medium since jstat itself is non-destructive but the tool establishes a pattern of running arbitrary JDK commands.

From the tool's definition 'Execute JDK jstat commands' — the tool runs an external JDK command-line tool (jstat) against a JVM process

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

HOW TO CONTROL GET_JSTAT_OUTPUT

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_jstat_output:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_jstat_output": {
      "limits": [
        {
          "counter": "get_jstat_output_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

get_jstat_output stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register JVM 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More JVM MCP Server tools

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All 15 JVM MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in JVM MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the get_jstat_output tool do? +

Execute JDK jstat commands. It is categorised as a Execute tool in the JVM MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on get_jstat_output? +

Register the JVM MCP Server MCP server in PolicyLayer and add a rule for get_jstat_output: 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.

What risk level is get_jstat_output? +

get_jstat_output is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit get_jstat_output? +

Yes. Add a rate_limit block to the get_jstat_output 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 get_jstat_output completely? +

Set action: deny in the PolicyLayer policy for get_jstat_output. 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 get_jstat_output? +

get_jstat_output 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.

Enforce policy on every JVM MCP Server tool call.

Deterministic rules across all 15 JVM MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN JVM →

Free to start. No card required.

15 JVM MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT GET_JSTAT_OUTPUT ON JVM MCP SERVER DOES

// THE RISK

// HOW TO CONTROL GET_JSTAT_OUTPUT

// EXPLORE