read_attachment

Return a bounded attachment as base64; it is never written, opened, or executed by the bridge.

SERVERMcp Control Plane SOURCEalbertik322-sudo/mcp-control-plane

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/mcp-control-plane/read-attachment.md

WHAT IT DOES

What read_attachment does on Mcp Control Plane

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

RISK

Why read_attachment is rated Low

This tool retrieves and encodes data (attachment as base64) without modifying, deleting, or executing anything. The explicit note that the attachment is 'never written, opened, or executed' confirms it performs read-only retrieval. Blast radius is minimal—an agent can access attachments it should theoretically have permission to read, but cannot alter system state.

From the tool's definition Tool name 'read_attachment' and description explicitly state it 'Return[s] a bounded attachment as base64' with the clarification that it is 'never written, opened, or executed'. This is a retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs read_attachment safely

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

read_attachment Allowed

read_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": {
    "read_attachment": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Control Plane, apply this rule, and every read_attachment call is checked against it from then on.

FAQ

Questions about read_attachment

What does the read_attachment tool do? +

Return a bounded attachment as base64; it is never written, opened, or executed by the bridge. It is categorised as a Read tool in the Mcp Control Plane MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_attachment? +

Register the Mcp Control Plane MCP server in PolicyLayer and add a rule for read_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 Mcp Control Plane. Nothing to install.

What risk level is read_attachment? +

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

Can I rate-limit read_attachment? +

Yes. Add a rate_limit block to the read_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 read_attachment completely? +

Set action: deny in the PolicyLayer policy for read_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 read_attachment? +

read_attachment is provided by the Mcp Control Plane MCP server (albertik322-sudo/mcp-control-plane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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