check_nfs

Check NFS file server availability. Verifies TCP connectivity on both the portmapper (111) and NFS (2049) ports. Both ports must be reachable for NFS mounts to work.

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

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/aaronckj-mcp-nettools/check-nfs.md

WHAT IT DOES

What check_nfs does on Mcp Nettools

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

RISK

Why check_nfs is rated Low

This tool performs network diagnostics by probing port reachability (TCP connectivity checks on ports 111 and 2049). It retrieves state information about NFS server availability without executing commands on the target, modifying any data, or triggering side effects. This is analogous to ping or DNS lookup—passive reconnaissance.

From the tool's definition Tool description states it 'Verifies TCP connectivity' and 'checks...availability' on specific ports. No data modification, deletion, or command execution is described. It is a diagnostic check that only queries network reachability status.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs check_nfs safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For check_nfs, this is the rule to start with:

check_nfs Allowed

check_nfs 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": {
    "check_nfs": {}
  }
}

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

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

FAQ

Questions about check_nfs

What does the check_nfs tool do? +

Check NFS file server availability. Verifies TCP connectivity on both the portmapper (111) and NFS (2049) ports. Both ports must be reachable for NFS mounts to work. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_nfs? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for check_nfs: 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 Mcp Nettools. Nothing to install.

What risk level is check_nfs? +

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

Can I rate-limit check_nfs? +

Yes. Add a rate_limit block to the check_nfs 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 check_nfs completely? +

Set action: deny in the PolicyLayer policy for check_nfs. 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 check_nfs? +

check_nfs is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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