Search emails using UIDs with advanced filters. Returns UIDs which are permanent identifiers that don\
AI agents call search_emails to retrieve information from Yahoo Mail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The search_emails tool performs information retrieval only. It searches and returns UIDs (unique identifiers) matching filter criteria, with no side effects. Although the server provides destructive tools (delete_emails, archive_emails), this specific tool is purely Read-category.
From the tool's definition Tool description states 'Search emails using UIDs with advanced filters. Returns UIDs' — a query operation that retrieves identifiers without modifying data.
Documented attack patterns abuse exactly the kind of access search_emails gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Yahoo Mail, and nothing reaches the server without passing your rules. This is the rule we recommend for search_emails:
{
"version": "1",
"default": "deny",
"tools": {
"search_emails": {}
}
}search_emails is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search emails using UIDs with advanced filters. Returns UIDs which are permanent identifiers that don\. It is categorised as a Read tool in the Yahoo Mail MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Mail MCP server in PolicyLayer and add a rule for search_emails: 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 Yahoo Mail. Nothing to install.
search_emails 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_emails 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_emails. 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_emails is provided by the Yahoo Mail MCP server (jtokib/yahoo-mail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Yahoo Mail, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Yahoo Mail tools catalogued and risk-classified — across an index of 43,000+ MCP servers.