Download attachments for a specific email or its entire thread
AI agents call download_email_attachments 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.
Downloading attachments is a read operation that retrieves data without side effects. While attachments may contain sensitive information, the tool itself performs only data retrieval. The severity is low because downloading does not modify Gmail state, execute code, delete data, or commit financial actions. Confidence is high because the description clearly indicates a read-only operation.
From the tool's definition Tool name is 'download_email_attachments' and description states it 'Download attachments for a specific email or its entire thread' — a retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access download_email_attachments gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for download_email_attachments:
{
"version": "1",
"default": "deny",
"tools": {
"download_email_attachments": {}
}
}download_email_attachments is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Download attachments for a specific email or its entire thread. 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 download_email_attachments: 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.
download_email_attachments 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 download_email_attachments 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 download_email_attachments. 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.
download_email_attachments is provided by the Gmail MCP Server MCP server (quantum-369/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Gmail MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.