Get a full normalized Arc tab record by explicit tab id.
AI agents call arc_get_tab to retrieve information from Arc Browser MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves tab metadata/state from Arc Browser by ID. It performs a simple query operation that returns information about a tab without creating, modifying, deleting, or executing any actions. The operation is read-only and has minimal blast radius—at worst, an AI agent learns what tabs are open and their properties.
From the tool's definition Tool name 'arc_get_tab' and description 'Get a full normalized Arc tab record by explicit tab id' indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get a full normalized Arc tab record by explicit tab id. It is categorised as a Read tool in the Arc Browser MCP MCP Server, which means it retrieves data without modifying state.
Register the Arc Browser MCP server in PolicyLayer and add a rule for arc_get_tab: 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 Arc Browser MCP. Nothing to install.
arc_get_tab 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 arc_get_tab 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 arc_get_tab. 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.
arc_get_tab is provided by the Arc Browser MCP server (jasoncronje/arc-browser-mcp). 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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