AI agents call get_current_buffer to retrieve information from Neovim MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the current buffer state without creating, modifying, deleting, or executing any operations. It is purely informational and has no side effects. The sibling tools include write operations (update_buffer, open_file) and reads (get_buffer_content, list_nvim_buffers), but this tool is clearly in the read category as it only retrieves which buffer is currently active.
From the tool's definition Tool name 'get_current_buffer' and description 'Get the currently active buffer in Neovim' indicate retrieval of state/data with no modification.
Documented attack patterns abuse exactly the kind of access get_current_buffer gives an agent:
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 get_current_buffer:
{
"version": "1",
"default": "deny",
"tools": {
"get_current_buffer": {}
}
}get_current_buffer is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the currently active buffer in Neovim. It is categorised as a Read tool in the Neovim MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Neovim MCP Server MCP server in PolicyLayer and add a rule for get_current_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.
get_current_buffer is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_current_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.
Set action: deny in the PolicyLayer policy for get_current_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.
get_current_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.
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.
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7 Neovim MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.