# renef_hook_java

A execute tool on the Renef MCP server.

Agent View of the PolicyLayer registry record for `renef_hook_java`. HTML page: https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-hook-java

## Facts

- Tool: `renef_hook_java`
- Server: Renef (`ahmeth4n/renef-mcp`) — https://policylayer.com/tools/ahmeth4n-renef-mcp.md
- Homepage: https://github.com/Ahmeth4n/renef-mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "renef_hook_java",
    "arguments": {}
  }
}
```

## Why renef_hook_java is rated High

Based on the server description, this tool likely hooks/intercepts Java methods at runtime on Android, which constitutes executing dynamic instrumentation code. Java interception is an active operation that modifies runtime behavior. The description is empty, reducing confidence, but the server context strongly implies Execute-level behavior.

From the tool's own definition: "Tool name 'renef_hook_java' on a server described as providing 'dynamic instrumentation and reverse engineering capabilities for Android ARM64, including native hooking, Java interception'"

## Use case

AI agents invoke renef_hook_java to trigger actions in Renef. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Renef:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "renef_hook_java": {
      "limits": [
        {
          "counter": "renef_hook_java_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Renef (74)

- `renef_hard_reset` — Destructive — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-hard-reset.md
- `renef_jni_delete_ref` — Destructive — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-jni-delete-ref.md
- `renef_port_forward_remove` — Destructive — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-port-forward-remove.md
- `renef_port_forward_remove_all` — Destructive — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-port-forward-remove-all.md
- `renef_server_kill` — Destructive — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-server-kill.md
- `adb_selinux_disable` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/adb-selinux-disable.md
- `adb_selinux_enable` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/adb-selinux-enable.md
- `adb_start_app_am` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/adb-start-app-am.md
- `adb_start_app_monkey` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/adb-start-app-monkey.md
- `adb_stop_app_am` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/adb-stop-app-am.md
- `renef_attach` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-attach.md
- `renef_cli_reset` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-cli-reset.md
- `renef_exec` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-exec.md
- `renef_hook_generate` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-hook-generate.md
- `renef_hook_native` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-hook-native.md
- `renef_jni_new_string` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-jni-new-string.md
- `renef_load_script` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-load-script.md
- `renef_mem_write` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write.md
- `renef_mem_write_u16` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write-u16.md
- `renef_mem_write_u32` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write-u32.md
- `renef_mem_write_u64` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write-u64.md
- `renef_mem_write_u8` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write-u8.md
- `renef_memory_patch` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-memory-patch.md
- `renef_port_forward_add` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-port-forward-add.md
- `renef_server_deploy` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-server-deploy.md
- `renef_server_restart` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-server-restart.md
- `renef_server_start` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-server-start.md
- `renef_spawn` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-spawn.md
- `renef_zero_copy_multiline_exec` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-zero-copy-multiline-exec.md
- `run` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/run.md
- …and 44 more: https://policylayer.com/tools/ahmeth4n-renef-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=ahmeth4n-renef-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/ahmeth4n-renef-mcp