AI agents call delete_file to permanently remove resources in Filesystem MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
File deletion cannot be undone and results in permanent data loss. This is the most severe category (Destructive > Execute > Write > Read). The high severity reflects the risk of an AI agent accidentally or maliciously deleting important files, with blast radius depending on filesystem permissions and path constraints.
From the tool's definition Tool name 'delete_file' indicates file deletion. No description provided, but sibling tools on this filesystem MCP server include write/read operations (copy_file, modify_file, read_file), establishing this as a filesystem operation tool.
Documented attack patterns abuse exactly the kind of access delete_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Filesystem MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_file:
{
"version": "1",
"default": "deny",
"hide": [
"delete_file"
]
}delete_file disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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delete_file. It is categorised as a Destructive tool in the Filesystem MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Filesystem MCP Server MCP server in PolicyLayer and add a rule for delete_file: 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 Filesystem MCP Server. Nothing to install.
delete_file is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete_file 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 delete_file. 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.
delete_file is provided by the Filesystem MCP Server MCP server (mark3labs/mcp-filesystem-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Filesystem MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
14 Filesystem MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.