List entries in a directory. Returns names with type markers (d/ for directory).
AI agents call list_dir to retrieve information from Copilot Studio Code without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
list_dir performs a directory listing, which is a query operation with no side effects. It retrieves metadata about filesystem entries but does not create, modify, delete, or execute anything. The blast radius of misuse is minimal — an AI agent could enumerate files to map the filesystem or discover sensitive filenames, but cannot directly access their contents or alter them.
From the tool's definition Tool description states 'List entries in a directory. Returns names with type markers' — this is a read-only operation that retrieves directory contents without modification.
Documented attack patterns abuse exactly the kind of access list_dir gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Copilot Studio Code, and nothing reaches the server without passing your rules. This is the rule we recommend for list_dir:
{
"version": "1",
"default": "deny",
"tools": {
"list_dir": {}
}
}list_dir is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List entries in a directory. Returns names with type markers (d/ for directory). It is categorised as a Read tool in the Copilot Studio Code MCP Server, which means it retrieves data without modifying state.
Register the Copilot Studio Code MCP server in PolicyLayer and add a rule for list_dir: 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 Copilot Studio Code. Nothing to install.
list_dir 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_dir 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_dir. 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_dir is provided by the Copilot Studio Code MCP server (taiki-yoshida/copilot-studio-code). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Copilot Studio Code, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 Copilot Studio Code tools catalogued and risk-classified — across an index of 43,000+ MCP servers.