wait_for_element · MacWright MCP: Risk & Policy

WHAT IT DOES

What wait_for_element does on MacWright

AI agents invoke wait_for_element to trigger actions in MacWright. 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 wait_for_element needs a policy

While the tool itself only waits for a condition and does not modify state, it is classified as Execute because: (1) it triggers conditional automation flows that depend on external input/arguments (the CSS selector), (2) it enables sequencing of the Execute-category sibling tools that perform clicks and interactions, and (3) misuse by an AI agent could lead to unauthorized navigation, form submission, or…

From the tool's definition The tool 'wait_for_element' performs a blocking operation that monitors DOM state in Safari and triggers continuation of automation actions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

wait_for_element Rate-limited

wait_for_element 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": {
    "wait_for_element": {
      "limits": [
        {
          "counter": "wait_for_element_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 MacWright, so you can run agents against it safely.

FAQ

Questions about wait_for_element

What does the wait_for_element tool do? +

Wait until a CSS selector exists in the current Safari page. It is categorised as a Execute tool in the MacWright MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on wait_for_element? +

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

What risk level is wait_for_element? +

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

Can I rate-limit wait_for_element? +

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

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

wait_for_element is provided by the MacWright MCP server (ruchit-p/macwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.