# mcp_enable

Enable an MCP server

Agent View of the PolicyLayer registry record for `mcp_enable`. HTML page: https://policylayer.com/tools/1mcp-app-agent/mcp-enable

## Facts

- Tool: `mcp_enable`
- Server: 1MCP Server (`1mcp-app/agent`) — https://policylayer.com/tools/1mcp-app-agent.md
- Homepage: https://github.com/1mcp-app/agent
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "mcp_enable",
    "arguments": {}
  }
}
```

## 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 own definition: "Tool name 'mcp_enable' and description 'Enable an MCP server' indicate the tool activates/modifies the state of an MCP server configuration."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches 1MCP Server:

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

## Other tools on 1MCP Server (16)

- `mcp_uninstall` — Destructive — https://policylayer.com/tools/1mcp-app-agent/mcp-uninstall.md
- `mcp_install` — Execute — https://policylayer.com/tools/1mcp-app-agent/mcp-install.md
- `mcp_reload` — Execute — https://policylayer.com/tools/1mcp-app-agent/mcp-reload.md
- `tool_invoke` — Execute — https://policylayer.com/tools/1mcp-app-agent/tool-invoke.md
- `mcp_info` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-info.md
- `mcp_list` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-list.md
- `mcp_registry_info` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-registry-info.md
- `mcp_registry_list` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-registry-list.md
- `mcp_registry_status` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-registry-status.md
- `mcp_search` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-search.md
- `mcp_status` — Read — https://policylayer.com/tools/1mcp-app-agent/mcp-status.md
- `tool_list` — Read — https://policylayer.com/tools/1mcp-app-agent/tool-list.md
- `tool_schema` — Read — https://policylayer.com/tools/1mcp-app-agent/tool-schema.md
- `mcp_disable` — Write — https://policylayer.com/tools/1mcp-app-agent/mcp-disable.md
- `mcp_edit` — Write — https://policylayer.com/tools/1mcp-app-agent/mcp-edit.md
- `mcp_update` — Write — https://policylayer.com/tools/1mcp-app-agent/mcp-update.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=1mcp-app-agent · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/1mcp-app-agent