list_browser_sessions

ServerNova Act
CategoryRead

WHAT IT DOES

What list_browser_sessions does on Nova Act

AI agents call list_browser_sessions to retrieve information from Nova Act without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_browser_sessions needs a policy

This tool only queries and returns metadata about existing browser sessions (IDs, status, timestamps, URLs). It has no side effects, does not execute instructions, does not modify or delete sessions, and does not perform financial operations. It is a straightforward information-retrieval tool used for discovery before other operations.

From the tool's definition Tool description states it 'Lists all active Nova Act browser sessions' and 'Returns details about each session' — purely a retrieval operation with no modification, deletion, or execution of browser actions.

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

POLICY

How to control list_browser_sessions

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

policy.json

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

list_browser_sessions 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 Nova Act — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Nova Act tools

Destructive end_session Closes the specified browser session and cleans up resources. Call this when done with a s Execute execute_instruction Executes a natural language instruction in an active browser session. Use task for the mai Execute start_session Starts and initializes a new browser session controlled by Nova Act, navigating to the spe Execute compress_logs Compresses Nova Act log files to reduce size while preserving important information. Optio Read fetch_file Retrieves the contents of a file from the server, with optional base64 encoding. Primarily Read inspect_browser Retrieves current state (URL, title) of an active browser session. Screenshot is omitted b Read view_compressed_log Retrieves and displays the contents of a compressed log file (.gz) previously created by t Read view_html_log Retrieves and displays HTML log files generated by Nova Act browser sessions. These logs c

All 9 Nova Act 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 list_browser_sessions

What does the list_browser_sessions tool do? +

Lists all active Nova Act browser sessions managed by this MCP server. Returns details about each session including their IDs, status, creation timestamps, and associated URLs. Use this to discover existing sessions before attempting to perform operations on them with other browser tools. Sessions that have ended or timed out will be automatically cleaned up. It is categorised as a Read tool in the Nova Act MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_browser_sessions? +

Register the Nova Act MCP server in PolicyLayer and add a rule for list_browser_sessions: 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 Nova Act. Nothing to install.

What risk level is list_browser_sessions? +

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

Can I rate-limit list_browser_sessions? +

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

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

list_browser_sessions is provided by the Nova Act MCP server (madtank/nova-act-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nova Act tool call.

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

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9 Nova Act tools catalogued and risk-classified — across an index of 43,000+ MCP servers.