List registered MCP servers.
AI agents call claudecron_list_mcp_servers to retrieve information from Email MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and displays information about registered MCP servers. It has no side effects, does not modify any data, and does not trigger external operations. It is a straightforward query/list operation, which falls squarely into the Read category.
From the tool's definition The tool name explicitly contains 'list' and the description states it performs a 'List' operation on registered MCP servers—a pure data retrieval action with no modification, deletion, or external effects.
Attacks that exploit this kind of access
List registered MCP servers. It is categorised as a Read tool in the Email MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Email MCP Server MCP server in PolicyLayer and add a rule for claudecron_list_mcp_servers: 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 Email MCP Server. Nothing to install.
claudecron_list_mcp_servers 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 claudecron_list_mcp_servers 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 claudecron_list_mcp_servers. 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.
claudecron_list_mcp_servers is provided by the Email MCP Server MCP server (sventern/mcp_email). 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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