Focus an element (e.g., to trigger focus events or enable keyboard input)
AI agents invoke element_focus to trigger actions in MCP Playwright Server. 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.
Focusing an element in a browser context is an Execute-class action: it runs a browser command that changes DOM state and may trigger event handlers or enable subsequent keyboard input. While not destructive or financial, it modifies the live browser state and could be misused to trigger unintended JavaScript handlers, spam keystroke input, or interact with forms without consent.
From the tool's definition Tool focuses an element via browser automation, which "triggers focus events or enables keyboard input" — this is an action that executes browser interactions with observable side effects.
Attacks that exploit this kind of access
Focus an element (e.g., to trigger focus events or enable keyboard input). It is categorised as a Execute tool in the MCP Playwright Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Playwright Server MCP server in PolicyLayer and add a rule for 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 Playwright Server. Nothing to install.
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 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 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.
element_focus is provided by the MCP Playwright Server MCP server (j0hanz/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
element_focus is one line of MCP Playwright Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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