List files in a directory (ls -la, or recursive find with depth 3).
AI agents call fs_list to retrieve information from Taw Computer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
fs_list retrieves and displays file system metadata (names, permissions, timestamps) but performs no write, execution, deletion, or financial operations. The operation is non-destructive and has no side effects. While the server provides access to a full Ubuntu desktop with significant capabilities, this specific tool is limited to read-only directory listing, making it low-risk for misuse.
From the tool's definition Tool description states 'List files in a directory' using 'ls -la, or recursive find with depth 3'. These are read-only operations that retrieve directory contents without modification.
Documented attack patterns abuse exactly the kind of access fs_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Taw Computer, and nothing reaches the server without passing your rules. This is the rule we recommend for fs_list:
{
"version": "1",
"default": "deny",
"tools": {
"fs_list": {}
}
}fs_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List files in a directory (ls -la, or recursive find with depth 3). It is categorised as a Read tool in the Taw Computer MCP Server, which means it retrieves data without modifying state.
Register the Taw Computer MCP server in PolicyLayer and add a rule for fs_list: 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 Taw Computer. Nothing to install.
fs_list 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 fs_list 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 fs_list. 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.
fs_list is provided by the Taw Computer MCP server (tawgroup/taw-computer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Taw Computer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Taw Computer tools catalogued and risk-classified — across an index of 43,000+ MCP servers.