List files in a directory
AI agents call fs_list_files to retrieve information from AI Code Review MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves directory contents for visibility purposes only. It has no side effects, cannot modify or delete data, and does not execute code. It falls squarely within the Read category. Severity is low because directory listing poses minimal risk even if abused—an agent could discover file names but cannot access file contents, modify data, or trigger operations.
From the tool's definition Tool name 'fs_list_files' and description 'List files in a directory' indicate directory enumeration without modification or execution. This is a read-only filesystem operation.
Attacks that exploit this kind of access
List files in a directory. It is categorised as a Read tool in the AI Code Review MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AI Code Review MCP Server MCP server in PolicyLayer and add a rule for fs_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 AI Code Review MCP Server. Nothing to install.
fs_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 fs_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 fs_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.
fs_list_files is provided by the AI Code Review MCP Server MCP server (namph-kozocom/review-code-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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