Download a specific email attachment
AI agents call outlook_download_attachment to retrieve information from Outlook without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Downloading an attachment is a read-only operation that retrieves data without modifying, deleting, or executing anything. The user specifies which attachment to download, but the operation cannot cause unintended side effects like data loss or code execution. Severity is low because attachment content retrieval poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name is 'outlook_download_attachment' and description states it 'Download[s] a specific email attachment'. This is a retrieval operation with no side effects on the attachment itself or email system.
Documented attack patterns abuse exactly the kind of access outlook_download_attachment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Outlook, and nothing reaches the server without passing your rules. This is the rule we recommend for outlook_download_attachment:
{
"version": "1",
"default": "deny",
"tools": {
"outlook_download_attachment": {}
}
}outlook_download_attachment is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Download a specific email attachment. It is categorised as a Read tool in the Outlook MCP Server, which means it retrieves data without modifying state.
Register the Outlook MCP server in PolicyLayer and add a rule for outlook_download_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 Outlook. Nothing to install.
outlook_download_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 outlook_download_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 outlook_download_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.
outlook_download_attachment is provided by the Outlook MCP server (xenoxilus/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Outlook, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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43 Outlook tools catalogued and risk-classified — across an index of 43,000+ MCP servers.