Get performance optimization patterns. Call this when optimizing lists, images, bundle size, or animations. Covers LegendList/FlashList/FlatList, image optimization, tree-shaking, barrel exports, Concurrent React (useDeferredValue, useTransition), InteractionManager, and Reanimated worklets. Use
AI agents call get-performance-patterns to retrieve information from React Native Expo MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though get-performance-patterns only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
Get performance optimization patterns. Call this when optimizing lists, images, bundle size, or animations. Covers LegendList/FlashList/FlatList, image optimization, tree-shaking, barrel exports, Concurrent React (useDeferredValue, useTransition), InteractionManager, and Reanimated worklets. Use. It is categorised as a Read tool in the React Native Expo MCP MCP Server, which means it retrieves data without modifying state.
Register the React Native Expo MCP server in PolicyLayer and add a rule for get-performance-patterns: 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 Expo MCP. Nothing to install.
get-performance-patterns is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get-performance-patterns 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 get-performance-patterns. 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.
get-performance-patterns is provided by the React Native Expo MCP server (zahargusyatin/react-native-expo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.