vim_tab · Mcp Neovim Server MCP: Risk & Policy

WHAT IT DOES

What vim_tab does on Mcp Neovim Server

AI agents invoke vim_tab to trigger actions in Mcp Neovim Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why vim_tab needs a policy

This tool manages Neovim tab operations including creating, closing, and navigating tabs. Creating and closing tabs triggers external operations within the Neovim editor environment. Closing a tab could potentially discard unsaved changes, but in general this is a UI/session management action.

From the tool's definition Manage Neovim tabs: create, close, and navigate between tabs

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vim_tab Rate-limited

vim_tab stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "vim_tab": {
      "limits": [
        {
          "counter": "vim_tab_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Neovim Server, so you can run agents against it safely.

FAQ

Questions about vim_tab

What does the vim_tab tool do? +

Manage Neovim tabs: create, close, and navigate between tabs. It is categorised as a Execute tool in the Mcp Neovim Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on vim_tab? +

Register the Mcp Neovim Server MCP server in PolicyLayer and add a rule for vim_tab: 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 Mcp Neovim Server. Nothing to install.

What risk level is vim_tab? +

vim_tab is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit vim_tab? +

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

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

vim_tab is provided by the Mcp Neovim Server MCP server (mcp-neovim-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.