renef_jni_delete_ref
Deletes a JNI global reference to prevent memory leaks.
This record as markdown: /tools/ahmeth4n-renef-mcp/renef-jni-delete-ref.md
What renef_jni_delete_ref does on Renef
AI agents call renef_jni_delete_ref to permanently remove resources in Renef, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why renef_jni_delete_ref is rated Critical
This tool irreversibly deletes a JNI global reference, which cannot be undone. While the stated purpose is benign (preventing memory leaks), in the context of an instrumentation/reverse engineering tool with native hooking capabilities, deleting a JNI reference could destroy critical runtime state, break application functionality, or interfere with hooked functions.
From the tool's definition Tool name contains 'delete' and description explicitly states 'Deletes a JNI global reference'. The action irreversibly removes a reference object from memory.
Attacks that exploit this kind of access
The rule that runs renef_jni_delete_ref safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Renef, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For renef_jni_delete_ref, this is the rule to start with:
renef_jni_delete_ref is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Renef, apply this rule, and every renef_jni_delete_ref call is checked against it from then on.
Questions about renef_jni_delete_ref
Deletes a JNI global reference to prevent memory leaks. It is categorised as a Destructive tool in the Renef MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Renef MCP server in PolicyLayer and add a rule for renef_jni_delete_ref: 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 Renef. Nothing to install.
renef_jni_delete_ref is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the renef_jni_delete_ref 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 renef_jni_delete_ref. 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.
renef_jni_delete_ref is provided by the Renef MCP server (ahmeth4n/renef-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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