renef_file_fdpath

Gets the file path for an open file descriptor.

SERVERRenef SOURCEahmeth4n/renef-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ahmeth4n-renef-mcp/renef-file-fdpath.md

WHAT IT DOES

What renef_file_fdpath does on Renef

AI agents call renef_file_fdpath to retrieve information from Renef without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why renef_file_fdpath is rated Low

This tool performs a read-only lookup to retrieve metadata about an open file descriptor. It queries system state to return a file path without side effects, making it a Read category tool.

From the tool's definition Tool name 'renef_file_fdpath' and description 'Gets the file path for an open file descriptor' indicate a query operation that retrieves information about file descriptor mappings without modifying or executing anything.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs renef_file_fdpath 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_file_fdpath, this is the rule to start with:

renef_file_fdpath Allowed

renef_file_fdpath is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "renef_file_fdpath": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Renef, apply this rule, and every renef_file_fdpath call is checked against it from then on.

FAQ

Questions about renef_file_fdpath

What does the renef_file_fdpath tool do? +

Gets the file path for an open file descriptor. It is categorised as a Read tool in the Renef MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on renef_file_fdpath? +

Register the Renef MCP server in PolicyLayer and add a rule for renef_file_fdpath: 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.

What risk level is renef_file_fdpath? +

renef_file_fdpath is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit renef_file_fdpath? +

Yes. Add a rate_limit block to the renef_file_fdpath 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.

How do I block renef_file_fdpath completely? +

Set action: deny in the PolicyLayer policy for renef_file_fdpath. 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.

What MCP server provides renef_file_fdpath? +

renef_file_fdpath 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.

KEEP EXPLORING

More on Renef, and thousands of servers like it.

This server

All 75 Renef tools →

Across the catalogue

claude_read_file on Claude Bridge → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →