List all available sub-servers (${serverNames.length} total).
AI agents call list_servers to retrieve information from Mcpcodeserver without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read-only operation to enumerate available MCP sub-servers. It retrieves metadata about the system configuration but does not create, modify, execute, or delete anything. The blast radius of misuse is minimal—an AI agent learning what servers are available poses no direct harm, though it could enable reconnaissance for subsequent attacks.
From the tool's definition Tool name is 'list_servers' and description states it 'List[s] all available sub-servers'. This is a query operation that retrieves information about available servers without modifying, executing code, or causing side effects.
Documented attack patterns abuse exactly the kind of access list_servers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcpcodeserver, and nothing reaches the server without passing your rules. This is the rule we recommend for list_servers:
{
"version": "1",
"default": "deny",
"tools": {
"list_servers": {}
}
}list_servers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all available sub-servers (${serverNames.length} total). It is categorised as a Read tool in the Mcpcodeserver MCP Server, which means it retrieves data without modifying state.
Register the Mcpcodeserver 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 Mcpcodeserver. Nothing to install.
list_servers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
list_servers is provided by the Mcpcodeserver MCP server (zbowling/mcpcodeserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcpcodeserver, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Mcpcodeserver tools catalogued and risk-classified — across an index of 43,000+ MCP servers.