mcp_enable

Enable an MCP server

SERVER1MCP Server SOURCE1mcp-app/agent

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/1mcp-app-agent/mcp-enable.md

WHAT IT DOES

What mcp_enable does on 1MCP Server

AI agents use mcp_enable to create or update resources in 1MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 1MCP Server environment.

RISK

Why mcp_enable is rated Medium

Enabling an MCP server modifies system configuration and makes that server's capabilities available to the AI assistant. While reversible (unlike Destructive), it creates or activates a new capability surface and has blast radius implications if the enabled server exposes dangerous tools. This is classified as Write rather than Read (has side effects) or Execute (doesn't run arbitrary code, just changes state).

From the tool's definition Tool name 'mcp_enable' and description 'Enable an MCP server' indicate the tool activates/modifies the state of an MCP server configuration.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mcp_enable 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_enable, this is the rule to start with:

mcp_enable Rate-limited

mcp_enable stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mcp_enable": {
      "limits": [
        {
          "counter": "mcp_enable_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_enable call is checked against it from then on.

FAQ

Questions about mcp_enable

What does the mcp_enable tool do? +

Enable an MCP server. It is categorised as a Write tool in the 1MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mcp_enable? +

Register the 1MCP Server MCP server in PolicyLayer and add a rule for mcp_enable: 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_enable? +

mcp_enable is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mcp_enable? +

Yes. Add a rate_limit block to the mcp_enable 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_enable completely? +

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

mcp_enable 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.

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