Read email content using UIDs (permanent identifiers). UIDs don\
AI agents call read_email 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.
This tool performs a read-only operation that retrieves email content by unique identifier. It has no side effects—it does not create, modify, delete, or execute anything. While email content could be sensitive, the tool itself poses minimal risk as it simply accesses existing data.
From the tool's definition Tool name: 'read_email'. Description: 'Read email content using UIDs'. The tool retrieves and displays email content without modifying, deleting, or executing any operations. It is purely a data retrieval function.
Documented attack patterns abuse exactly the kind of access read_email 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 read_email:
{
"version": "1",
"default": "deny",
"tools": {
"read_email": {}
}
}read_email is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read email content using UIDs (permanent identifiers). UIDs 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 read_email: 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.
read_email 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 read_email 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 read_email. 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.
read_email 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.