Get a detailed listing of all files and directories in a specified path, including sizes.
AI agents call list_directory_with_sizes to retrieve information from Server Sequential Thinking without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves information about directory contents and file sizes. It performs a read-only operation similar to ls or dir commands with size information. No data is created, modified, deleted, or executed. The blast radius is minimal—an agent could gather filesystem information, but cannot alter or remove data.
From the tool's definition Tool name 'list_directory_with_sizes' and description 'Get a detailed listing of all files and directories in a specified path, including sizes' indicate retrieval of file system metadata with no modification or deletion of data.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Get a detailed listing of all files and directories in a specified path, including sizes. It is categorised as a Read tool in the Server Sequential Thinking MCP Server, which means it retrieves data without modifying state.
Register the Server Sequential Thinking MCP server in PolicyLayer and add a rule for list_directory_with_sizes: 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 Server Sequential Thinking. Nothing to install.
list_directory_with_sizes 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_directory_with_sizes 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_directory_with_sizes. 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_directory_with_sizes is provided by the Server Sequential Thinking MCP server (@modelcontextprotocol/server-sequential-thinking). 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.
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