AI agents call list_files to retrieve information from Omni Fs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns directory/file listings without modifying, deleting, or executing any operations. It is a straightforward read-only operation analogous to 'ls' or 'dir' commands. The low severity reflects minimal blast radius even if an AI agent misuses it—the worst outcome would be unauthorized information disclosure of file paths and names, not data loss or system compromise.
From the tool's definition Tool name 'list_files' and description 'List files and directories in the specified path' indicate a retrieval operation with no data modification or side effects.
Attacks that exploit this kind of access
List files and directories in the specified path. It is categorised as a Read tool in the Omni Fs MCP Server, which means it retrieves data without modifying state.
Register the Omni Fs MCP server in PolicyLayer and add a rule for list_files: 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 Omni Fs. Nothing to install.
list_files 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 list_files 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 list_files. 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.
list_files is provided by the Omni Fs MCP server (vaayne/omni-fs-mcp). 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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