AI agents call list_tabs to retrieve information from Webclaw without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the current state of the browser (open tabs) without modifying, executing, or deleting anything. It is a straightforward information retrieval action. The risk is low because listing tabs reveals only metadata about the user's current browsing state, with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list_tabs' and description 'List all open browser tabs' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_tabs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Webclaw, and nothing reaches the server without passing your rules. This is the rule we recommend for list_tabs:
{
"version": "1",
"default": "deny",
"tools": {
"list_tabs": {}
}
}list_tabs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all open browser tabs. It is categorised as a Read tool in the Webclaw MCP Server, which means it retrieves data without modifying state.
Register the Webclaw MCP server in PolicyLayer and add a rule for list_tabs: 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 Webclaw. Nothing to install.
list_tabs 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_tabs 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_tabs. 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_tabs is provided by the Webclaw MCP server (kuroko1t/webclaw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Webclaw, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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21 Webclaw tools catalogued and risk-classified — across an index of 43,000+ MCP servers.