List files and folders in a given directory.
AI agents call list_directory to retrieve information from Modular MCP Server & Client without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation to enumerate filesystem contents. It has no capability to modify, delete, or execute anything. The sibling tools show a pattern where destructive operations (delete_file) and executable operations (execute_command) are separate tools, confirming this is classified as a pure read operation. Blast radius is minimal—an agent can learn directory structure but cannot cause damage.
From the tool's definition Tool name 'list_directory' and description 'List files and folders in a given directory' indicate a query operation that retrieves directory contents without modification or side effects.
Attacks that exploit this kind of access
List files and folders in a given directory. It is categorised as a Read tool in the Modular MCP Server & Client MCP Server, which means it retrieves data without modifying state.
Register the Modular MCP Server & Client MCP server in PolicyLayer and add a rule for list_directory: 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 Modular MCP Server & Client. Nothing to install.
list_directory 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 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. 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 is provided by the Modular MCP Server & Client MCP server (jackmichaud/modular-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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