AI agents call smb_share_get to retrieve information from Truenas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about a specific SMB share identified by its ID. The verb 'Get' and the absence of any modification language clearly indicate a read-only operation with no side effects. The blast radius of misuse is minimal—an attacker could only enumerate or view SMB share configurations, which is low risk compared to write, execute, or destructive operations.
From the tool's definition Tool name 'smb_share_get' and description 'Get an SMB share by ID' indicate retrieval of existing data without modification.
Documented attack patterns abuse exactly the kind of access smb_share_get gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for smb_share_get:
{
"version": "1",
"default": "deny",
"tools": {
"smb_share_get": {}
}
}smb_share_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get an SMB share by ID. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.
Register the Truenas MCP server in PolicyLayer and add a rule for smb_share_get: 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 Truenas. Nothing to install.
smb_share_get 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 smb_share_get 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 smb_share_get. 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.
smb_share_get is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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279 Truenas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.