network_performance

THE RISK

Low Risk

Why network_performance needs a policy

The tool reads and returns network performance statistics from a browser tab. It performs no writes, executions, or destructive actions. The blast radius if misused is minimal, as it only exposes potentially sensitive network timing/performance data.

From the tool's definition 'Get network performance statistics for a connected browser tab' — retrieves/queries data with no side effects

Documented attack patterns abuse exactly the kind of access network_performance gives an agent:

POLICY

How to control network_performance

PolicyLayer is an MCP gateway — it sits between your AI agents and Browser Connect, and nothing reaches the server without passing your rules. This is the rule we recommend for network_performance:

policy.json

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

network_performance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Browser Connect — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Browser Connect tools

Execute browser_launch Launch a new browser instance with debugging enabled Execute performance_profile Advanced performance profiling with bottleneck detection and recommendations Execute debug_localhost Launch browser with a localhost URL and automatically connect for debugging Execute backend_debugger_attach Attach to a Node.js process debugger for breakpoint debugging Execute browser_connect Connect to a specific browser tab for debugging Read backend_logs_stream Stream and search logs from backend applications (files, processes, Docker containers) Read browser_list_tabs List all available browser tabs that can be connected to Read console_advanced_search Advanced console search with pattern matching, correlation, and statistics

All 16 Browser Connect tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about network_performance

What does the network_performance tool do? +

Get network performance statistics for a connected browser tab. It is categorised as a Read tool in the Browser Connect MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on network_performance? +

Register the Browser Connect MCP server in PolicyLayer and add a rule for network_performance: 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 Browser Connect. Nothing to install.

What risk level is network_performance? +

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

Can I rate-limit network_performance? +

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

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

network_performance is provided by the Browser Connect MCP server (perception30/browser-connect-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Browser Connect tool call.

Start from Browser Connect, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →