PutObject · MinIO Model-Context Protocol (MCP) Server MCP

WHAT IT DOES

What PutObject does on MinIO Model-Context Protocol (MCP) Server

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

WHY IT NEEDS A POLICY

Why PutObject needs a policy

An AI agent can call PutObject faster than any human can review — one bad instruction and it creates or modifies resources in MinIO Model-Context Protocol (MCP) Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

PutObject Rate-limited

PutObject 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": {
    "PutObject": {
      "limits": [
        {
          "counter": "putobject_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 Model-Context Protocol (MCP) Server, so you can run agents against it safely.

FAQ

Questions about PutObject

What does the PutObject tool do? +

Uploads a file to MinIO bucket using fput method. It is categorised as a Write tool in the MinIO Model-Context Protocol (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 PutObject? +

Register the MinIO Model-Context Protocol (MCP) Server MCP server in PolicyLayer and add a rule for PutObject: 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 Model-Context Protocol (MCP) Server. Nothing to install.

What risk level is PutObject? +

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

Can I rate-limit PutObject? +

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

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

PutObject is provided by the MinIO Model-Context Protocol (MCP) Server MCP server (ucesys/minio-python-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.