AI agents call read_full_buf to retrieve information from Nvim without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description, the naming convention strongly suggests this tool retrieves/queries the full contents of a Neovim buffer without modification. The tool is part of a Neovim control interface where read operations (get_state, get_buf_diagnostics, get_all_diagnostics) coexist with write/modify operations (add_virtual_text, find_and_replace_buf), and this tool clearly belongs to the read category based on…
From the tool's definition Tool name 'read_full_buf' indicates reading buffer contents from a Neovim session. No side effects implied in the name or the description (which is empty). Sibling tools include get_state and get_state_brief, reinforcing a read-only context pattern.
Documented attack patterns abuse exactly the kind of access read_full_buf gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nvim, and nothing reaches the server without passing your rules. This is the rule we recommend for read_full_buf:
{
"version": "1",
"default": "deny",
"tools": {
"read_full_buf": {}
}
}read_full_buf is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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read_full_buf. It is categorised as a Read tool in the Nvim MCP Server, which means it retrieves data without modifying state.
Register the Nvim MCP server in PolicyLayer and add a rule for read_full_buf: 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 Nvim. Nothing to install.
read_full_buf 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 read_full_buf 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 read_full_buf. 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.
read_full_buf is provided by the Nvim MCP server (paulburgess1357/nvim-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Nvim tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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17 Nvim tools catalogued and risk-classified — across an index of 42,500+ MCP servers.