Get buffer contents with line numbers
AI agents call vim_buffer to retrieve information from Mcp Neovim Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays buffer contents—a query operation with no side effects. It does not modify, delete, or execute code. The read-only nature and informative description support high confidence classification as a Read risk category with low severity, as misuse would only expose existing data rather than cause destructive or executable harm.
From the tool's definition Tool name 'vim_buffer' and description 'Get buffer contents with line numbers' indicate a read-only operation that retrieves buffer data without modification.
Attacks that exploit this kind of access
Get buffer contents with line numbers. It is categorised as a Read tool in the Mcp Neovim Server MCP Server, which means it retrieves data without modifying state.
Register the Mcp Neovim Server MCP server in PolicyLayer and add a rule for vim_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 Mcp Neovim Server. Nothing to install.
vim_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 vim_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 vim_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.
vim_buffer 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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