AI agents call get_email_thread to retrieve information from Mcp Gmail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves email thread data without modifying, deleting, or executing actions. It is a Read operation. Severity is medium rather than low because email can contain sensitive personal, financial, or confidential information; an AI agent with unrestricted access could exfiltrate private communications, though the tool itself does not delete or modify data.
From the tool's definition Tool name 'get_email_thread' combined with server description stating it 'retrieve[s] email threads' indicates data retrieval with no modification. Description field is empty but sibling tools and server context clearly show this is a read operation.
Attacks that exploit this kind of access
get_email_thread. It is categorised as a Read tool in the Mcp Gmail MCP Server, which means it retrieves data without modifying state.
Register the Mcp Gmail MCP server in PolicyLayer and add a rule for get_email_thread: 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 Mcp Gmail. Nothing to install.
get_email_thread 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 get_email_thread 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 get_email_thread. 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.
get_email_thread is provided by the Mcp Gmail MCP server (martingaston/mcp-gmail). 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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