Read a specific Gmail message
AI agents call readEmail to retrieve information from Gmail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves email message content without altering, deleting, or executing any operations. It is a straightforward Read operation. Severity is medium rather than low because email messages often contain sensitive personal information (passwords, financial details, private communications, etc.), so unauthorized read access has meaningful privacy and security implications.
From the tool's definition Tool name 'readEmail' and description 'Read a specific Gmail message' clearly indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Read a specific Gmail message. It is categorised as a Read tool in the Gmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for readEmail: 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 Gmail MCP Server. Nothing to install.
readEmail 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 readEmail 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 readEmail. 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.
readEmail is provided by the Gmail MCP Server MCP server (zacco16/gmail-mcp-server). 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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