AI agents call get_mailbox_stats to retrieve information from Bichon without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only query operation that retrieves and summarizes existing mailbox data. It has no side effects, cannot modify or delete information, and poses minimal risk to the system. The blast radius of misuse is limited to potential exposure of email metadata (sender names, subject frequencies, message counts), which is low-severity information disclosure.
From the tool's definition Tool retrieves aggregated statistics (counts, top senders, top subjects) from a mailbox without creating, modifying, or deleting any data.
Attacks that exploit this kind of access
Stats for a specific mailbox folder: total count, top senders, top subjects by frequency. It is categorised as a Read tool in the Bichon MCP Server, which means it retrieves data without modifying state.
Register the Bichon MCP server in PolicyLayer and add a rule for get_mailbox_stats: 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 Bichon. Nothing to install.
get_mailbox_stats 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 get_mailbox_stats 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 get_mailbox_stats. 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.
get_mailbox_stats is provided by the Bichon MCP server (pras-labs/bichon-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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