Scroll until RN element matching selector becomes visible. For long lists and off-screen elements. After scrolling, use query_selector to get the element position for tap.
AI agents invoke scroll_until_visible to trigger actions in React Native. 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.
This tool performs an active UI automation gesture (scrolling) on a React Native application. It's not merely reading data but executing a browser/app interaction action. While scrolling itself is relatively benign, it manipulates the app's UI state and is part of an automation chain (followed by tap actions).
From the tool's definition 'Scroll until RN element matching selector becomes visible' — triggers a physical UI automation action (scrolling) on a running app, which is an external operation with side effects on the app's UI state
Attacks that exploit this kind of access
Scroll until RN element matching selector becomes visible. For long lists and off-screen elements. After scrolling, use query_selector to get the element position for tap. It is categorised as a Execute tool in the React Native MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the React Native MCP server in PolicyLayer and add a rule for scroll_until_visible: 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 React Native. Nothing to install.
scroll_until_visible 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 scroll_until_visible 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 scroll_until_visible. 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.
scroll_until_visible is provided by the React Native MCP server (@ohah/react-native-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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