List debuggable React Native runtimes exposed by Metro. Call when a runtime tool reports TARGET_AMBIGUOUS or to check what is connectable. Requires Metro running.
AI agents call list_runtime_targets to retrieve information from React Native Dev without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of available debugging targets from Metro. It performs information retrieval without modifying, executing code, or causing irreversible changes. Even in the context of a development environment, listing available runtimes is a passive diagnostic operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool description states 'List debuggable React Native runtimes' and 'to check what is connectable' — it retrieves and lists runtime information.
Attacks that exploit this kind of access
List debuggable React Native runtimes exposed by Metro. Call when a runtime tool reports TARGET_AMBIGUOUS or to check what is connectable. Requires Metro running. It is categorised as a Read tool in the React Native Dev MCP Server, which means it retrieves data without modifying state.
Register the React Native Dev MCP server in PolicyLayer and add a rule for list_runtime_targets: 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 Dev. Nothing to install.
list_runtime_targets 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 list_runtime_targets 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 list_runtime_targets. 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.
list_runtime_targets is provided by the React Native Dev MCP server (luizhbesper/react-native-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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