upload_image_from_url

A write tool on the Ha Nexus Agent MCP server.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/fistacho-ha-nexus-agent/upload-image-from-url.md

WHAT IT DOES

What upload_image_from_url does on Ha Nexus Agent

AI agents use upload_image_from_url to create or update resources in Ha Nexus Agent, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ha Nexus Agent environment.

RISK

Why upload_image_from_url is rated Medium

Uploading an image is a Write operation—it creates or stores new data in the system reversibly. Severity is medium because uncontrolled image uploads could fill storage, introduce unwanted media, or potentially be exploited for injection attacks depending on downstream processing, but the operation itself is reversible (images can be deleted).

From the tool's definition Tool name 'upload_image_from_url' indicates it accepts a URL and uploads/stores an image, modifying the Home Assistant system state. Description is empty, limiting precision.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload_image_from_url safely

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

upload_image_from_url Rate-limited

upload_image_from_url 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": {
    "upload_image_from_url": {
      "limits": [
        {
          "counter": "upload_image_from_url_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ha Nexus Agent, apply this rule, and every upload_image_from_url call is checked against it from then on.

FAQ

Questions about upload_image_from_url

What does the upload_image_from_url tool do? +

upload_image_from_url is a write tool on the Ha Nexus Agent MCP server. It is categorised as a Write tool in the Ha Nexus Agent 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_image_from_url? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for upload_image_from_url: 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 Ha Nexus Agent. Nothing to install.

What risk level is upload_image_from_url? +

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

Can I rate-limit upload_image_from_url? +

Yes. Add a rate_limit block to the upload_image_from_url 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_image_from_url completely? +

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

upload_image_from_url is provided by the Ha Nexus Agent MCP server (fistacho/ha-nexus-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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