Returns the list of directories that this server is allowed to access.
AI agents call list_allowed_directories to retrieve information from MCP Filesystem Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries metadata about the server's access permissions and returns informational content. It performs no modifications, deletions, or external operations. The read-only nature and lack of any capability to alter state makes this a straightforward Read classification with low severity—an AI agent cannot misuse this to cause harm.
From the tool's definition Tool name 'list_allowed_directories' and description 'Returns the list of directories' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_allowed_directories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Filesystem Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_allowed_directories:
{
"version": "1",
"default": "deny",
"tools": {
"list_allowed_directories": {}
}
}list_allowed_directories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns the list of directories that this server is allowed to access. It is categorised as a Read tool in the MCP Filesystem Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Filesystem Server MCP server in PolicyLayer and add a rule for list_allowed_directories: 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 MCP Filesystem Server. Nothing to install.
list_allowed_directories 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_allowed_directories 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_allowed_directories. 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_allowed_directories is provided by the MCP Filesystem Server MCP server (safurrier/mcp-filesystem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 MCP Filesystem Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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21 MCP Filesystem Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.