list_servers

THE RISK

Low Risk

Why list_servers needs a policy

This tool retrieves and displays information about available MCP servers without creating, modifying, deleting, or executing any operations. It is purely informational and non-destructive, making it a Read category tool with low severity.

From the tool's definition Tool name 'list_servers' and description 'see what MCP servers are available' indicate a query/list operation with no modification of state.

Documented attack patterns abuse exactly the kind of access list_servers gives an agent:

POLICY

How to control list_servers

PolicyLayer is an MCP gateway — it sits between your AI agents and Code Mode Toon, and nothing reaches the server without passing your rules. This is the rule we recommend for list_servers:

policy.json

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

list_servers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Code Mode Toon — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Code Mode Toon tools

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All 8 Code Mode Toon tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_servers

What does the list_servers tool do? +

CALL FIRST to see what MCP servers are available. Shows loaded, lazy (on-demand), and disabled servers. It is categorised as a Read tool in the Code Mode Toon MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_servers? +

Register the Code Mode Toon MCP server in PolicyLayer and add a rule for list_servers: 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 Code Mode Toon. Nothing to install.

What risk level is list_servers? +

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

Can I rate-limit list_servers? +

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

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

list_servers is provided by the Code Mode Toon MCP server (ziad-hsn/code-mode-toon). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Code Mode Toon tool call.

Start from Code Mode Toon, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →