mail_get_attachment

SERVERAIquila — Nextcloud MCP Server SOURCEelgorro/aiquila

Low RISK CLASS

Category Read

Parameters 22 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aiquila-nextcloud-mcp-server/mail-get-attachment.md

WHAT IT DOES

What mail_get_attachment does on AIquila — Nextcloud MCP Server

AI agents call mail_get_attachment to retrieve information from AIquila — Nextcloud MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`messageId`	number	Yes	Message ID (from mail_read_message)
`attachmentId`	string	Yes	Attachment ID shown in mail_read_message (e.g. "2")

Parameters from the server's own tool schema.

RISK

Why mail_get_attachment is rated Low

This tool retrieves and displays attachment content from an existing email message. It performs a read-only operation with no side effects, no code execution, no data modification, and no destructive capability. The only potential risk is unauthorized access to email attachments, which is mitigated by requiring valid message ID and attachment ID.

From the tool's definition Tool name is 'mail_get_attachment' and description states it 'Download[s] an email attachment' and 'Returns text for text files...image data for images, extracted text for PDFs'. The verb 'download' and 'returns' indicate retrieval without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mail_get_attachment safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AIquila — Nextcloud MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mail_get_attachment, this is the rule to start with:

mail_get_attachment Allowed

mail_get_attachment is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mail_get_attachment": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AIquila — Nextcloud MCP Server, apply this rule, and every mail_get_attachment call is checked against it from then on.

FAQ

Questions about mail_get_attachment

What does the mail_get_attachment tool do? +

Download an email attachment by message ID and attachment ID. Returns text for text files and calendar invites (ICS), image data for images, extracted text for PDFs (requires pdftotext). Attachment IDs are shown in mail_read_message output. It is categorised as a Read tool in the AIquila — Nextcloud MCP Server MCP Server, which means it retrieves data without modifying state.

What parameters does mail_get_attachment accept? +

mail_get_attachment accepts 2 parameters: messageId, attachmentId. Required: messageId, attachmentId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on mail_get_attachment? +

Register the AIquila — Nextcloud MCP Server MCP server in PolicyLayer and add a rule for mail_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 AIquila — Nextcloud MCP Server. Nothing to install.

What risk level is mail_get_attachment? +

mail_get_attachment is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mail_get_attachment? +

Yes. Add a rate_limit block to the mail_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.

How do I block mail_get_attachment completely? +

Set action: deny in the PolicyLayer policy for mail_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.

What MCP server provides mail_get_attachment? +

mail_get_attachment is provided by the AIquila — Nextcloud MCP Server MCP server (elgorro/aiquila). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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