AI agents call cronjob_list 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 and displays cron job information without modifying, executing, or deleting any data. It is a passive information-gathering operation with minimal security risk unless the cron job details themselves contain sensitive information. The low severity reflects that viewing scheduled tasks does not directly impact system operations or data integrity.
From the tool's definition Tool name 'cronjob_list' and description 'List all cron jobs' indicate a retrieval operation with no side effects. The verb 'list' is explicitly a Read operation that queries existing data.
Documented attack patterns abuse exactly the kind of access cronjob_list 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 cronjob_list:
{
"version": "1",
"default": "deny",
"tools": {
"cronjob_list": {}
}
}cronjob_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 all cron jobs. 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 cronjob_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 Truenas. Nothing to install.
cronjob_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 cronjob_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 cronjob_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.
cronjob_list 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.