reload_buffer

THE RISK

Medium Risk

Why reload_buffer needs a policy

Reloading a buffer from disk overwrites the current in-memory buffer state with the on-disk version. This is a reversible write operation (the previous buffer state is replaced), but it could cause loss of unsaved in-buffer changes. It does not delete files or execute code, making Write the most appropriate category.

From the tool's definition Reload a buffer from disk. Use this after editing a file externally to refresh the buffer in Neovim.

Documented attack patterns abuse exactly the kind of access reload_buffer gives an agent:

POLICY

How to control reload_buffer

PolicyLayer is an MCP gateway — it sits between your AI agents and Neovim MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for reload_buffer:

policy.json

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

reload_buffer 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.

Create a free account and register Neovim MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Neovim MCP Server tools

Write reload_all_buffers Check all open buffers and reload any that have changed on disk. Use this after editing fi Write open_file Open a file in Neovim. Use this to open newly created files or existing files for editing. Write update_buffer Update the content of a buffer in Neovim. Changes appear immediately in the editor. Read get_buffer_content Get the content of a specific buffer by path Read get_current_buffer Get the currently active buffer in Neovim Read list_nvim_buffers List all open buffers in Neovim instances running in the current directory

All 7 Neovim MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about reload_buffer

What does the reload_buffer tool do? +

Reload a buffer from disk. Use this after editing a file externally to refresh the buffer in Neovim. It is categorised as a Write tool in the Neovim MCP 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 reload_buffer? +

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

What risk level is reload_buffer? +

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

Can I rate-limit reload_buffer? +

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

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

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

Enforce policy on every Neovim MCP Server tool call.

Start from Neovim MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →