open_deeplink · React Native MCP: Risk & Policy

WHAT IT DOES

What open_deeplink does on React Native

AI agents invoke open_deeplink 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.

WHY IT NEEDS A POLICY

Why open_deeplink needs a policy

Opening a deep link triggers an external navigation operation on a device/simulator, executing a URL scheme that can launch app screens or external actions. This goes beyond a simple read — it actively drives app behavior. The blast radius is medium since a malicious deep link could navigate to sensitive screens or trigger in-app actions, but it is generally reversible.

From the tool's definition Open deep link on simulator/device. Navigate to screens via URL scheme.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

open_deeplink Rate-limited

open_deeplink 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "open_deeplink": {
      "limits": [
        {
          "counter": "open_deeplink_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches React Native, so you can run agents against it safely.

FAQ

Questions about open_deeplink

What does the open_deeplink tool do? +

Open deep link on simulator/device. Navigate to screens via URL scheme. 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.

How do I enforce a policy on open_deeplink? +

Register the React Native MCP server in PolicyLayer and add a rule for open_deeplink: 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.

What risk level is open_deeplink? +

open_deeplink is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit open_deeplink? +

Yes. Add a rate_limit block to the open_deeplink 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.

How do I block open_deeplink completely? +

Set action: deny in the PolicyLayer policy for open_deeplink. 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.

What MCP server provides open_deeplink? +

open_deeplink 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.