Download an email attachment. Returns text content for text types, or an embedded blob resource for binary files (PDF, images, etc). Use get_message first to see attachment IDs.
AI agents call get_attachment to retrieve information from Mail Cal Drive without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves attachment data from emails without creating, modifying, deleting, or executing anything. It is a straightforward read operation that queries and returns existing email attachment content.
From the tool's definition Tool description explicitly states 'Download an email attachment' and 'Returns text content...or an embedded blob resource'. The verb 'Download' and 'Returns' indicate data retrieval with no modification or deletion of the attachment itself.
Attacks that exploit this kind of access
Download an email attachment. Returns text content for text types, or an embedded blob resource for binary files (PDF, images, etc). Use get_message first to see attachment IDs. It is categorised as a Read tool in the Mail Cal Drive MCP Server, which means it retrieves data without modifying state.
Register the Mail Cal Drive MCP server in PolicyLayer and add a rule for get_attachment: 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 Mail Cal Drive. Nothing to install.
get_attachment 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_attachment 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_attachment. 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_attachment is provided by the Mail Cal Drive MCP server (rumbitopi/mail-cal-drive-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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