renef_mem_write
Writes raw bytes to memory at the specified address.
This record as markdown: /tools/ahmeth4n-renef-mcp/renef-mem-write.md
What renef_mem_write does on Renef
AI agents invoke renef_mem_write 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.
Why renef_mem_write is rated High
Writing raw bytes to arbitrary memory addresses on a running Android process is an extremely dangerous operation. It can corrupt program state, bypass security checks, inject shellcode, or crash the target process. This is not a simple 'Write' (data creation/modification) but an Execute-tier operation because it directly manipulates process memory, enabling arbitrary code execution.
From the tool's definition Writes raw bytes to memory at the specified address
Attacks that exploit this kind of access
The rule that runs renef_mem_write 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_mem_write, this is the rule to start with:
renef_mem_write 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Renef, apply this rule, and every renef_mem_write call is checked against it from then on.
Questions about renef_mem_write
Writes raw bytes to memory at the specified address. It is categorised as a Execute tool in the Renef MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Renef MCP server in PolicyLayer and add a rule for renef_mem_write: 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_mem_write is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the renef_mem_write 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_mem_write. 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_mem_write 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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