List all crontab entries for the current user with line numbers.
AI agents call list_crontab to retrieve information from Mcp Crontab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of crontab entries. It retrieves and displays existing scheduling data without creating, modifying, deleting, or executing anything. The primary risk is information disclosure about scheduled tasks, which is low severity in most contexts.
From the tool's definition Tool name is 'list_crontab' and description states it 'List[s] all crontab entries for the current user' — a retrieval operation with no modification or execution capability.
Attacks that exploit this kind of access
List all crontab entries for the current user with line numbers. It is categorised as a Read tool in the Mcp Crontab MCP Server, which means it retrieves data without modifying state.
Register the Mcp Crontab MCP server in PolicyLayer and add a rule for list_crontab: 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 Mcp Crontab. Nothing to install.
list_crontab 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_crontab 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_crontab. 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_crontab is provided by the Mcp Crontab MCP server (jasona7/mcp-crontab-server). 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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