AI agents invoke browser_screen_type to trigger actions in Playwright 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.
This tool types text into browser elements, which is a browser automation action. Typing text can submit forms, trigger searches, enter credentials, or interact with web applications in ways that have real-world side effects. Since it drives external operations whose effects depend on what is typed and where, it falls under Execute.
From the tool's definition "Type text" in a browser automation context — triggers keyboard input actions in a live browser session, affecting external web applications
Documented attack patterns abuse exactly the kind of access browser_screen_type gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_screen_type:
{
"version": "1",
"default": "deny",
"tools": {
"browser_screen_type": {
"limits": [
{
"counter": "browser_screen_type_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}browser_screen_type 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.
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Type text. It is categorised as a Execute tool in the Playwright MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Playwright MCP server in PolicyLayer and add a rule for browser_screen_type: 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 Playwright MCP. Nothing to install.
browser_screen_type 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_screen_type 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_screen_type. 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_screen_type is provided by the Playwright MCP server (korwabs/playwright-record-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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32 Playwright MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.