Register a directory for access. This allows the AI to dynamically gain access
AI agents use register_directory to create or update resources in Vulcan File Ops — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vulcan File Ops environment.
This tool creates or modifies access control state (registration of directories) rather than directly operating on files. It is reversible (directories can be unregistered) and enables subsequent file operations but does not itself read, execute code, or destructively delete data. It is categorized as Write because it modifies the system's access configuration.
From the tool's definition Tool description states 'Register a directory for access' and 'dynamically gain access', indicating it modifies the access control configuration of the filesystem server.
Documented attack patterns abuse exactly the kind of access register_directory gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vulcan File Ops, and nothing reaches the server without passing your rules. This is the rule we recommend for register_directory:
{
"version": "1",
"default": "deny",
"tools": {
"register_directory": {
"limits": [
{
"counter": "register_directory_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}register_directory 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.
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Register a directory for access. This allows the AI to dynamically gain access. It is categorised as a Write tool in the Vulcan File Ops MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vulcan File Ops MCP server in PolicyLayer and add a rule for register_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 Vulcan File Ops. Nothing to install.
register_directory is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the register_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 register_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.
register_directory is provided by the Vulcan File Ops MCP server (n0zer0d4y/vulcan-file-ops). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vulcan File Ops, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
15 Vulcan File Ops tools catalogued and risk-classified — across an index of 43,000+ MCP servers.