verify_image_urls · DataFlow MCP Server MCP: Risk & Policy

WHAT IT DOES

What verify_image_urls does on DataFlow MCP Server

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

WHY IT NEEDS A POLICY

Why verify_image_urls needs a policy

This tool modifies database records by marking broken images, which is a reversible write operation. It does not delete data but updates document fields. The blast radius is medium since it could incorrectly mark valid images as broken across multiple contest records if misused.

From the tool's definition 'verify image URLs for contests and mark broken images in the database'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

verify_image_urls Rate-limited

verify_image_urls 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": {
    "verify_image_urls": {
      "limits": [
        {
          "counter": "verify_image_urls_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 DataFlow MCP Server, so you can run agents against it safely.

FAQ

Questions about verify_image_urls

What does the verify_image_urls tool do? +

Verify image URLs for contests and mark broken images in the database. It is categorised as a Write tool in the DataFlow 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 verify_image_urls? +

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

What risk level is verify_image_urls? +

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

Can I rate-limit verify_image_urls? +

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

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

verify_image_urls is provided by the DataFlow MCP Server MCP server (sreetarak2/dataflow_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.