Switch to a tab by index, or by url_contains (first tab whose URL contains the substring).
AI agents invoke tab_select to trigger actions in MCP Camoufox. 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.
Tab selection triggers a browser action that changes the active browser context/state. While it doesn't modify data directly, it executes a browser control operation that can redirect agent focus to different web pages, potentially enabling subsequent actions in sensitive contexts. In a stealth browser designed to bypass bot detection, switching tabs is an operational browser action that falls under Execute.
From the tool's definition Switch to a tab by index, or by url_contains (first tab whose URL contains the substring)
Documented attack patterns abuse exactly the kind of access tab_select gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Camoufox, and nothing reaches the server without passing your rules. This is the rule we recommend for tab_select:
{
"version": "1",
"default": "deny",
"tools": {
"tab_select": {
"limits": [
{
"counter": "tab_select_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}tab_select 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.
Free to start. No card required.
Switch to a tab by index, or by url_contains (first tab whose URL contains the substring). It is categorised as a Execute tool in the MCP Camoufox MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Camoufox MCP server in PolicyLayer and add a rule for tab_select: 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 MCP Camoufox. Nothing to install.
tab_select is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the tab_select 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 tab_select. 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.
tab_select is provided by the MCP Camoufox MCP server (robithyusuf/mcp-camoufox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Camoufox, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
102 MCP Camoufox tools catalogued and risk-classified — across an index of 43,000+ MCP servers.