AI agents call list_tabs to retrieve information from PageMap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves tab state information with no side effects or external operations. It falls clearly into the Read category as a data query operation. Severity is low since listing tabs poses minimal risk—it only exposes the current state of the user's browser session, which is informational and non-destructive.
From the tool's definition Tool name 'list_tabs' and description 'List all open tabs with their current state' indicate a query-only operation that retrieves information about open tabs without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List all open tabs with their current state. It is categorised as a Read tool in the PageMap MCP Server, which means it retrieves data without modifying state.
Register the PageMap 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 PageMap. 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 PageMap MCP server (oci:docker.io/retio1001/pagemap:0.7.3). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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