AI agents call list_directory to retrieve information from RimSage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and retrieves information (directory contents) with no side effects, data modification, or external operations. It is a standard informational read operation on the file system. As part of a source code browsing server (RimSage), it facilitates navigation without risk of unintended consequences.
From the tool's definition Tool name 'list_directory' and description 'List contents of a directory' indicate a read-only operation that retrieves and displays directory structure without modification.
Documented attack patterns abuse exactly the kind of access list_directory gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and RimSage, and nothing reaches the server without passing your rules. This is the rule we recommend for list_directory:
{
"version": "1",
"default": "deny",
"tools": {
"list_directory": {}
}
}list_directory is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List contents of a directory. It is categorised as a Read tool in the RimSage MCP Server, which means it retrieves data without modifying state.
Register the RimSage 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 RimSage. 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 RimSage MCP server (realloon/rimsage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 RimSage tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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6 RimSage tools catalogued and risk-classified — across an index of 42,500+ MCP servers.