upload_asset

THE RISK

Medium Risk

Why upload_asset needs a policy

This tool creates or adds data to the system (uploads assets) which is reversible—uploaded assets can typically be deleted. It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool name 'upload_asset' and description 'Upload an image/video to Krea for use in generations' indicate the tool creates new data (assets) on the Krea platform that persists and can be used in subsequent operations.

Documented attack patterns abuse exactly the kind of access upload_asset gives an agent:

POLICY

How to control upload_asset

PolicyLayer is an MCP gateway — it sits between your AI agents and Krea MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_asset:

policy.json

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

upload_asset 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.

Create a free account and register Krea MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Krea MCP Server tools

Execute generate_image Generate an image using Krea AI. Returns a job_id - use get_job to check status and get th Execute generate_video Generate a video using Krea AI. Returns a job_id - use get_job to check status and get the Read get_asset Get details of an uploaded asset Read get_job Get the status and results of a generation job. Returns status (scheduled, processing, com Read get_style Get details of a specific style Read list_assets List uploaded assets Read list_jobs List generation jobs with optional filtering Read search_styles Search for styles/LoRAs to use in image generation

All 9 Krea MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about upload_asset

What does the upload_asset tool do? +

Upload an image/video to Krea for use in generations. It is categorised as a Write tool in the Krea 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 upload_asset? +

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

What risk level is upload_asset? +

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

Can I rate-limit upload_asset? +

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

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

upload_asset is provided by the Krea MCP Server MCP server (keugenek/krea-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Krea MCP Server tool call.

Start from Krea MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →