Show inbox as a rich Prefab card with subject, sender, and date.
AI agents call show_inbox_card to retrieve information from MiniMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and presents inbox contents (subject, sender, date metadata) for viewing purposes. It performs no data creation, modification, deletion, code execution, or financial operations. The action is read-only with no side effects, making it a Read category tool with low severity risk—an AI agent cannot misuse it to cause harm beyond potentially accessing email metadata it has permission to view.
From the tool's definition Tool name 'show_inbox_card' combined with description 'Show inbox as a rich Prefab card with subject, sender, and date' indicates retrieval and display of existing email data without modification.
Attacks that exploit this kind of access
Show inbox as a rich Prefab card with subject, sender, and date. It is categorised as a Read tool in the MiniMail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MiniMail MCP Server MCP server in PolicyLayer and add a rule for show_inbox_card: 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 MiniMail MCP Server. Nothing to install.
show_inbox_card 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 show_inbox_card 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 show_inbox_card. 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.
show_inbox_card is provided by the MiniMail MCP Server MCP server (sandraschi/email-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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