download_from_url · Openclaw Syncralis MCP: Risk & Policy

WHAT IT DOES

What download_from_url does on Openclaw Syncralis

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

WHY IT NEEDS A POLICY

Why download_from_url needs a policy

The tool fetches remote content and writes it to the local workspace filesystem. This is primarily a Write operation (creates a new file or overwrites an existing one). It could introduce malicious content, but the core action is a reversible file creation. Severity is medium because an agent could be tricked into downloading harmful payloads or overwriting important workspace files.

From the tool's definition Downloads a file directly from a public or authenticated HTTP/HTTPS URL and saves it to the workspace

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

download_from_url Rate-limited

download_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": {
    "download_from_url": {
      "limits": [
        {
          "counter": "download_from_url_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 Openclaw Syncralis, so you can run agents against it safely.

FAQ

Questions about download_from_url

What does the download_from_url tool do? +

Downloads a file directly from a public or authenticated HTTP/HTTPS URL and saves it to the workspace. It is categorised as a Write tool in the Openclaw Syncralis MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on download_from_url? +

Register the Openclaw Syncralis MCP server in PolicyLayer and add a rule for download_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 Openclaw Syncralis. Nothing to install.

What risk level is download_from_url? +

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

Can I rate-limit download_from_url? +

Yes. Add a rate_limit block to the download_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 download_from_url completely? +

Set action: deny in the PolicyLayer policy for download_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 download_from_url? +

download_from_url is provided by the Openclaw Syncralis MCP server (pslkk/openclaw-syncralis). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.