vim_fold · Mcp Neovim Server MCP: Risk & Policy

WHAT IT DOES

What vim_fold does on Mcp Neovim Server

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

WHY IT NEEDS A POLICY

Why vim_fold needs a policy

Folding operations create and modify fold markers/state within a buffer, which is a reversible write action. While folding doesn't permanently delete data, it does alter editor state. This is less severe than Execute (which would run code) but qualifies as Write rather than Read because it modifies buffer state.

From the tool's definition Tool manages code folding with 'create, open, close, and toggle folds' operations - these are reversible state modifications to the editor's folding state without deleting or executing code.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vim_fold Rate-limited

vim_fold 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": {
    "vim_fold": {
      "limits": [
        {
          "counter": "vim_fold_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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_fold

What does the vim_fold tool do? +

Manage code folding: create, open, close, and toggle folds. It is categorised as a Write tool in the Mcp Neovim 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 vim_fold? +

Register the Mcp Neovim Server MCP server in PolicyLayer and add a rule for vim_fold: 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_fold? +

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

Can I rate-limit vim_fold? +

Yes. Add a rate_limit block to the vim_fold 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_fold completely? +

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

vim_fold 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.