AI agents call read_email to retrieve information from Zoho Mail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves email content without side effects. It queries existing data using identifiers returned by other tools, matching the Read category definition of data retrieval with no side effects. Severity is low because email content exposure is contained to already-identified messages and does not affect system state or enable financial/destructive actions.
From the tool's definition Tool description explicitly states 'Read the full body of an email' and takes only identifier parameters (messageId, folderId) with no modification capabilities.
Attacks that exploit this kind of access
Read the full body of an email given its messageId and folderId (both returned by list_inbox and search_emails). It is categorised as a Read tool in the Zoho Mail MCP Server, which means it retrieves data without modifying state.
Register the Zoho 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 Zoho 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 Zoho Mail MCP server (sirgreed808/zoho-mail-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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