Type into an input field in Chrome/Electron. Uses CDP Input.dispatchKeyEvent for real keyboard events (works with React/Angular).
AI agents invoke browser_type to trigger actions in ScreenHand. 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 dispatches real keyboard events into browser input fields via Chrome DevTools Protocol. It triggers external operations (UI interactions) whose effects depend on what is typed — ranging from benign form fills to submitting credentials or malicious input. It goes beyond a simple write because it executes actual input events in a running browser process.
From the tool's definition Type into an input field in Chrome/Electron. Uses CDP Input.dispatchKeyEvent for real keyboard events
Documented attack patterns abuse exactly the kind of access browser_type gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ScreenHand, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_type:
{
"version": "1",
"default": "deny",
"tools": {
"browser_type": {
"limits": [
{
"counter": "browser_type_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}browser_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 into an input field in Chrome/Electron. Uses CDP Input.dispatchKeyEvent for real keyboard events (works with React/Angular). It is categorised as a Execute tool in the ScreenHand MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ScreenHand MCP server in PolicyLayer and add a rule for browser_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 ScreenHand. Nothing to install.
browser_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_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_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_type is provided by the ScreenHand MCP server (manushi4/screenhand). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ScreenHand, 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.
89 ScreenHand tools catalogued and risk-classified — across an index of 43,000+ MCP servers.