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 Filesystem MCP Server (HTTP Streaming) without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns file system metadata (directory listing with file sizes). It has no side effects, cannot modify data, and poses minimal risk. The operation is purely informational, making it a Read category tool with low severity. High confidence due to explicit description indicating listing/retrieval only.
From the tool's definition Tool description states 'Get a detailed listing of all files and directories in a specified path, including sizes' — retrieves directory contents and metadata with no modification or deletion.
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 Filesystem MCP Server (HTTP Streaming) MCP Server, which means it retrieves data without modifying state.
Register the Filesystem MCP Server (HTTP Streaming) 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 Filesystem MCP Server (HTTP Streaming). 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 Filesystem MCP Server (HTTP Streaming) MCP server (jeswin/mcpfs). 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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