List ZFS snapshots. Always specify a dataset to avoid timeouts on large systems.
AI agents call list_snapshots to retrieve information from Truenas Ws without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays ZFS snapshot metadata without creating, modifying, deleting, or executing any operations. It is a pure read operation. The severity is low because listing snapshots does not expose sensitive data at scale—only metadata about existing snapshots—and has no blast radius for accidental misuse.
From the tool's definition Tool name is 'list_snapshots' and description states it 'List[s] ZFS snapshots', which is a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
List ZFS snapshots. Always specify a dataset to avoid timeouts on large systems. It is categorised as a Read tool in the Truenas Ws MCP Server, which means it retrieves data without modifying state.
Register the Truenas Ws MCP server in PolicyLayer and add a rule for list_snapshots: 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 Ws. Nothing to install.
list_snapshots 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_snapshots 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_snapshots. 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_snapshots is provided by the Truenas Ws MCP server (thoriphes/truenas-ws-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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