download_attachment

Download email attachment to configured download path

SERVERCowork Bench SOURCE0717376/cowork_bench

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cowork-bench/download-attachment.md

WHAT IT DOES

What download_attachment does on Cowork Bench

AI agents call download_attachment to retrieve information from Cowork Bench without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why download_attachment is rated Low

Even though download_attachment only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs download_attachment safely

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

download_attachment Allowed

download_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": {
    "download_attachment": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Cowork Bench, apply this rule, and every download_attachment call is checked against it from then on.

FAQ

Questions about download_attachment

What does the download_attachment tool do? +

Download email attachment to configured download path. It is categorised as a Read tool in the Cowork Bench MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on download_attachment? +

Register the Cowork Bench MCP server in PolicyLayer and add a rule for 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 Cowork Bench. Nothing to install.

What risk level is download_attachment? +

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

Can I rate-limit download_attachment? +

Yes. Add a rate_limit block to the 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.

How do I block download_attachment completely? +

Set action: deny in the PolicyLayer policy for 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.

What MCP server provides download_attachment? +

download_attachment is provided by the Cowork Bench MCP server (0717376/cowork_bench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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