reg_list_subkeys

List the immediate subkey names of a key, up to limit.

SERVERMcp Hands SOURCEhuocai250/mcp-hands

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/mcp-hands/reg-list-subkeys.md

WHAT IT DOES

What reg_list_subkeys does on Mcp Hands

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

RISK

Why reg_list_subkeys is rated Low

Even though reg_list_subkeys only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs reg_list_subkeys safely

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

reg_list_subkeys Allowed

reg_list_subkeys 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": {
    "reg_list_subkeys": {}
  }
}

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

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

FAQ

Questions about reg_list_subkeys

What does the reg_list_subkeys tool do? +

List the immediate subkey names of a key, up to limit. It is categorised as a Read tool in the Mcp Hands MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on reg_list_subkeys? +

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

What risk level is reg_list_subkeys? +

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

Can I rate-limit reg_list_subkeys? +

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

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

reg_list_subkeys is provided by the Mcp Hands MCP server (huocai250/mcp-hands). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Mcp Hands, and thousands of servers like it.

This server

All 378 Mcp Hands tools →

Across the catalogue

list_symbols on ACE-MCP →aiva_list_affiliates on AIVA MCP Server → The MCP Attack Database →

Guides

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