Get project folder structure and file placement guide. Call this when deciding where to place a new file. Covers the full folder tree, where to put screens/components/hooks/services/stores/types/constants, naming conventions, and import aliases. Use
AI agents call get-project-structure 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-project-structure 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 project folder structure and file placement guide. Call this when deciding where to place a new file. Covers the full folder tree, where to put screens/components/hooks/services/stores/types/constants, naming conventions, and import aliases. 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-project-structure: 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-project-structure 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-project-structure 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-project-structure. 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-project-structure 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.