mcp_list

List MCP servers

SERVER1MCP Server SOURCE1mcp-app/agent

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/1mcp-app-agent/mcp-list.md

WHAT IT DOES

What mcp_list does on 1MCP Server

AI agents call mcp_list to retrieve information from 1MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why mcp_list is rated Low

This tool retrieves and displays information about configured MCP servers. It has no side effects—it does not create, modify, delete, or execute anything. It is purely informational, similar to 'list' or 'get' operations. The blast radius of misuse is minimal; an AI agent could at most enumerate available servers to gather information about system configuration.

From the tool's definition Tool name 'mcp_list' and description 'List MCP servers' indicate a query/retrieval operation with no modification or execution of external systems.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mcp_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 1MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mcp_list, this is the rule to start with:

mcp_list Allowed

mcp_list 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": {
    "mcp_list": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect 1MCP Server, apply this rule, and every mcp_list call is checked against it from then on.

FAQ

Questions about mcp_list

What does the mcp_list tool do? +

List MCP servers. It is categorised as a Read tool in the 1MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mcp_list? +

Register the 1MCP Server MCP server in PolicyLayer and add a rule for mcp_list: 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 1MCP Server. Nothing to install.

What risk level is mcp_list? +

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

Can I rate-limit mcp_list? +

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

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

mcp_list is provided by the 1MCP Server MCP server (1mcp-app/agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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