capture_webpage · Figmad MCP: Risk & Policy

WHAT IT DOES

What capture_webpage does on Figmad

AI agents invoke capture_webpage to trigger actions in Figmad. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why capture_webpage needs a policy

The tool performs an external operation (fetching and rendering a webpage) that goes beyond simple data retrieval — it drives a browser or rendering engine, executes JavaScript on the target page, and analyzes the resulting DOM. This constitutes triggering external operations dependent on arguments, placing it in the Execute category.

From the tool's definition 'Capture a webpage screenshot and analyze its DOM structure' — actively fetches a remote URL, renders it, and analyzes its DOM, triggering external network operations whose effects depend on the URL argument

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

capture_webpage Rate-limited

capture_webpage stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "capture_webpage": {
      "limits": [
        {
          "counter": "capture_webpage_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Figmad, so you can run agents against it safely.

FAQ

Questions about capture_webpage

What does the capture_webpage tool do? +

Capture a webpage screenshot and analyze its DOM structure. Detects UI components like buttons, inputs, cards, navigation. Returns capture ID for use with reconstruct_page. It is categorised as a Execute tool in the Figmad MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on capture_webpage? +

Register the Figmad MCP server in PolicyLayer and add a rule for capture_webpage: 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 Figmad. Nothing to install.

What risk level is capture_webpage? +

capture_webpage is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit capture_webpage? +

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

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

capture_webpage is provided by the Figmad MCP server (toro1221/figmad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.