minio_copy_object · MinIO MCP Server MCP: Risk & Policy

WHAT IT DOES

What minio_copy_object does on MinIO MCP Server

AI agents use minio_copy_object to create or update resources in MinIO MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MinIO MCP Server environment.

WHY IT NEEDS A POLICY

Why minio_copy_object needs a policy

Copying an object is a write operation that creates new data (the copy) without irreversibly destroying the original. This is reversible—the copy can be deleted. However, it carries high severity because an agent could copy sensitive or large objects to unintended locations, potentially exposing data or consuming storage resources maliciously.

From the tool's definition Tool name 'minio_copy_object' and description 'Copy an object to another location in MinIO' indicate the tool creates a duplicate of data at a new location, modifying the storage state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

minio_copy_object Rate-limited

minio_copy_object stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "minio_copy_object": {
      "limits": [
        {
          "counter": "minio_copy_object_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MinIO MCP Server, so you can run agents against it safely.

FAQ

Questions about minio_copy_object

What does the minio_copy_object tool do? +

Copy an object to another location in MinIO. It is categorised as a Write tool in the MinIO MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on minio_copy_object? +

Register the MinIO MCP Server MCP server in PolicyLayer and add a rule for minio_copy_object: 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 MinIO MCP Server. Nothing to install.

What risk level is minio_copy_object? +

minio_copy_object is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit minio_copy_object? +

Yes. Add a rate_limit block to the minio_copy_object 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 minio_copy_object completely? +

Set action: deny in the PolicyLayer policy for minio_copy_object. 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 minio_copy_object? +

minio_copy_object is provided by the MinIO MCP Server MCP server (raphaelren/minio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.