Builds a call tree for a specific method from a .jfr file. Filters ExecutionSample events to find stack traces containing the given class and method, then aggregates call paths. Use when you want to see who calls a particular method and from where. Limitation: JFR sampling (~10 ms) may miss very ...
Risk signalsAccepts file system path (filepath)
Part of the Javaperf server.
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AI agents call trace_method to retrieve information from Javaperf without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though trace_method only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"trace_method": {}
}
}See the full Javaperf policy for all 26 tools.
These attack patterns abuse exactly the kind of access trace_method gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Builds a call tree for a specific method from a .jfr file. Filters ExecutionSample events to find stack traces containing the given class and method, then aggregates call paths. Use when you want to see who calls a particular method and from where. Limitation: JFR sampling (~10 ms) may miss very fast methods.. It is categorised as a Read tool in the Javaperf MCP Server, which means it retrieves data without modifying state.
Register the Javaperf MCP server in PolicyLayer and add a rule for trace_method: 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 Javaperf. Nothing to install.
trace_method 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 trace_method 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 trace_method. 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.
trace_method is provided by the Javaperf MCP server (javaperf). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Javaperf tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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