AI agents invoke xpath_click_nowait to trigger actions in uiautomator2 MCP Server. 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.
The tool appears to perform a click/tap action on an Android device UI element identified by an XPath selector, without waiting for a result. This constitutes executing an action on an external system (Android device). The 'nowait' suffix suggests it fires the action asynchronously. Misuse could trigger unintended UI interactions, purchases, or app actions.
From the tool's definition Tool name 'xpath_click_nowait' suggests clicking a UI element identified by XPath without waiting; server description mentions 'tapping' as an automated action on Android devices
Documented attack patterns abuse exactly the kind of access xpath_click_nowait gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and uiautomator2 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for xpath_click_nowait:
{
"version": "1",
"default": "deny",
"tools": {
"xpath_click_nowait": {
"limits": [
{
"counter": "xpath_click_nowait_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}xpath_click_nowait 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.
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xpath_click_nowait. It is categorised as a Execute tool in the uiautomator2 MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the uiautomator2 MCP Server MCP server in PolicyLayer and add a rule for xpath_click_nowait: 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 uiautomator2 MCP Server. Nothing to install.
xpath_click_nowait is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the xpath_click_nowait 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.
Set action: deny in the PolicyLayer policy for xpath_click_nowait. 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.
xpath_click_nowait is provided by the uiautomator2 MCP Server MCP server (tanbro/uiautomator2-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from uiautomator2 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
77 uiautomator2 MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.