arc_reload_tabs · Arc Browser MCP: Risk & Policy

WHAT IT DOES

What arc_reload_tabs does on Arc Browser MCP

AI agents invoke arc_reload_tabs to trigger actions in Arc Browser MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why arc_reload_tabs needs a policy

Reloading tabs is an active browser operation that re-fetches and re-executes page content, which qualifies as Execute. It has limited blast radius since it doesn't destroy data or move money, but misuse could disrupt user sessions or trigger unintended page scripts.

From the tool's definition 'Reload one or more Arc tabs by explicit tab id' — triggers an external browser operation (reloading tabs)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

arc_reload_tabs Rate-limited

arc_reload_tabs stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "arc_reload_tabs": {
      "limits": [
        {
          "counter": "arc_reload_tabs_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Arc Browser MCP, so you can run agents against it safely.

FAQ

Questions about arc_reload_tabs

What does the arc_reload_tabs tool do? +

Reload one or more Arc tabs by explicit tab id. It is categorised as a Execute tool in the Arc Browser MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on arc_reload_tabs? +

Register the Arc Browser MCP server in PolicyLayer and add a rule for arc_reload_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 Arc Browser MCP. Nothing to install.

What risk level is arc_reload_tabs? +

arc_reload_tabs is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit arc_reload_tabs? +

Yes. Add a rate_limit block to the arc_reload_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.

How do I block arc_reload_tabs completely? +

Set action: deny in the PolicyLayer policy for arc_reload_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.

What MCP server provides arc_reload_tabs? +

arc_reload_tabs 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.