# renef_mem_write_u64

Writes an unsigned 64-bit integer to memory.

Agent View of the PolicyLayer registry record for `renef_mem_write_u64`. HTML page: https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-mem-write-u64

## Facts

- Tool: `renef_mem_write_u64`
- 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_mem_write_u64",
    "arguments": {}
  }
}
```

## Why renef_mem_write_u64 is rated High

Writing arbitrary values to arbitrary memory addresses in a running process is a powerful low-level operation that can corrupt state, bypass security controls, alter execution flow, or crash processes. It is irreversible in the sense that the previous memory state is overwritten, but unlike file deletion it is better categorized as Execute (memory manipulation / dynamic instrumentation) rather than Destructive.

From the tool's own definition: "Writes an unsigned 64-bit integer to memory"

## Use case

AI agents invoke renef_mem_write_u64 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_mem_write_u64": {
      "limits": [
        {
          "counter": "renef_mem_write_u64_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_java` — Execute — https://policylayer.com/tools/ahmeth4n-renef-mcp/renef-hook-java.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_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