Open email in browser
AI agents call open-email to retrieve information from Gmail Plugin MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool opens an email in the browser for reading/viewing purposes. It retrieves and displays existing data without modifying, deleting, or sending anything. The action is read-only in nature, similar to 'read-email' but presented in a browser UI. Severity is low as it only displays existing email content.
From the tool's definition 'Open email in browser' - opens/displays an email for viewing
Attacks that exploit this kind of access
Open email in browser. It is categorised as a Read tool in the Gmail Plugin MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail Plugin MCP Server MCP server in PolicyLayer and add a rule for open-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 Gmail Plugin MCP Server. Nothing to install.
open-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 open-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 open-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.
open-email is provided by the Gmail Plugin MCP Server MCP server (sanchisingh01/mcp-server---gmail-plugin-for-claude-desktop). 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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