List email clients available for generated email previews.
AI agents call mailosaur_previews_list_email_clients to retrieve information from Mailosaur MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates a static list of email clients supported by the Mailosaur preview generation feature. It performs a read-only query with no side effects, no data modification, no code execution, and no destructive operations. The blast radius of misuse is minimal as it only exposes metadata about available email clients.
From the tool's definition Tool name contains 'list' and description states 'List email clients available for generated email previews' - a straightforward query operation that retrieves information about available email clients with no modification, deletion, or execution of external…
Attacks that exploit this kind of access
List email clients available for generated email previews. It is categorised as a Read tool in the Mailosaur MCP MCP Server, which means it retrieves data without modifying state.
Register the Mailosaur MCP server in PolicyLayer and add a rule for mailosaur_previews_list_email_clients: 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 Mailosaur MCP. Nothing to install.
mailosaur_previews_list_email_clients 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 mailosaur_previews_list_email_clients 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 mailosaur_previews_list_email_clients. 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.
mailosaur_previews_list_email_clients is provided by the Mailosaur MCP server (mrnewdelhi/mailosaur-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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