Control the focus state of a specific element. You can either set focus on an element (useful for keyboard navigation and form interactions) or remove focus from an element (useful for clearing active states and form validation).
AI agents invoke browser_element_focus to trigger actions in MCP Macaco Playwright. 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.
This tool triggers browser actions (focus/blur events) on DOM elements, which can cause side effects such as triggering form validation, event handlers, or keyboard navigation flows. It falls under Execute as it performs browser interactions whose effects depend on the target element and context.
From the tool's definition 'Control the focus state of a specific element' and 'set focus on an element (useful for keyboard navigation and form interactions) or remove focus from an element'
Attacks that exploit this kind of access
Control the focus state of a specific element. You can either set focus on an element (useful for keyboard navigation and form interactions) or remove focus from an element (useful for clearing active states and form validation). It is categorised as a Execute tool in the MCP Macaco Playwright MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Macaco Playwright MCP server in PolicyLayer and add a rule for browser_element_focus: 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 Macaco Playwright. Nothing to install.
browser_element_focus 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 browser_element_focus 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 browser_element_focus. 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.
browser_element_focus is provided by the MCP Macaco Playwright MCP server (macacoai/mcp-playwright). 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.
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