system_webview

Inspect WebView via Chrome DevTools Protocol (Android only)

SERVERClaude Mobile SOURCEalexgladkov/claude-in-mobile

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/alexgladkov-claude-in-mobile/system-webview.md

WHAT IT DOES

What system_webview does on Claude Mobile

AI agents call system_webview to retrieve information from Claude Mobile without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why system_webview is rated Low

The tool is described as 'Inspect' which implies reading/querying the WebView state via Chrome DevTools Protocol. However, CDP can also execute JavaScript and perform write/execute operations, but the description only mentions inspection. Confidence is moderate because CDP access could enable execute-level capabilities not explicitly described.

From the tool's definition Inspect WebView via Chrome DevTools Protocol

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs system_webview safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Claude Mobile, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For system_webview, this is the rule to start with:

system_webview Allowed

system_webview is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "system_webview": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Claude Mobile, apply this rule, and every system_webview call is checked against it from then on.

FAQ

Questions about system_webview

What does the system_webview tool do? +

Inspect WebView via Chrome DevTools Protocol (Android only). It is categorised as a Read tool in the Claude Mobile MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on system_webview? +

Register the Claude Mobile MCP server in PolicyLayer and add a rule for system_webview: 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 Claude Mobile. Nothing to install.

What risk level is system_webview? +

system_webview is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit system_webview? +

Yes. Add a rate_limit block to the system_webview 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 system_webview completely? +

Set action: deny in the PolicyLayer policy for system_webview. 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 system_webview? +

system_webview is provided by the Claude Mobile MCP server (alexgladkov/claude-in-mobile). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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