AI agents call search to retrieve information from Inbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only searches and retrieves email message metadata (subject and sender fields). It has no side effects—it does not create, modify, delete, or execute any operations. While email content may be sensitive, the Read category encompasses all retrieval operations.
From the tool's definition Tool name 'search' and description 'Search messages by subject or sender' indicate a query/retrieval operation with no data modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Search messages by subject or sender. It is categorised as a Read tool in the Inbox MCP Server, which means it retrieves data without modifying state.
Register the Inbox MCP server in PolicyLayer and add a rule for search: 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 Inbox. Nothing to install.
search 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 search 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 search. 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.
search is provided by the Inbox MCP server (p-w-4-z/inbox-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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