filesystem_set_acl

Set the Access Control List (ACL) for a file or directory. This is a powerful operation — the

SERVERNasbridge SOURCEmaverick0628/nasbridge

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/nasbridge/filesystem-set-acl.md

WHAT IT DOES

What filesystem_set_acl does on Nasbridge

AI agents use filesystem_set_acl to create or update resources in Nasbridge, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nasbridge environment.

RISK

Why filesystem_set_acl is rated Medium

The tool modifies access control permissions on filesystem objects, which is a reversible write operation with potentially broad security implications. While ACLs can be changed back, improper modification could lock users out of critical files or expose sensitive data. The description explicitly characterizes it as 'powerful,' indicating significant blast radius.

From the tool's definition 'Set the Access Control List (ACL) for a file or directory. This is a powerful operation'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs filesystem_set_acl safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nasbridge, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For filesystem_set_acl, this is the rule to start with:

filesystem_set_acl Rate-limited

filesystem_set_acl stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "filesystem_set_acl": {
      "limits": [
        {
          "counter": "filesystem_set_acl_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nasbridge, apply this rule, and every filesystem_set_acl call is checked against it from then on.

FAQ

Questions about filesystem_set_acl

What does the filesystem_set_acl tool do? +

Set the Access Control List (ACL) for a file or directory. This is a powerful operation — the. It is categorised as a Write tool in the Nasbridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on filesystem_set_acl? +

Register the Nasbridge MCP server in PolicyLayer and add a rule for filesystem_set_acl: 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 Nasbridge. Nothing to install.

What risk level is filesystem_set_acl? +

filesystem_set_acl is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit filesystem_set_acl? +

Yes. Add a rate_limit block to the filesystem_set_acl 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.

How do I block filesystem_set_acl completely? +

Set action: deny in the PolicyLayer policy for filesystem_set_acl. 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.

What MCP server provides filesystem_set_acl? +

filesystem_set_acl is provided by the Nasbridge MCP server (maverick0628/nasbridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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