AI agents invoke browser_type to trigger actions in YetiBrowser 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.
Typing text into an editable element is a browser automation action that can trigger form submissions, searches, chat messages, or other side effects depending on the target. It goes beyond a passive read and can cause state changes in external web applications, placing it in the Execute category. Misuse could lead to unintended data entry or form submissions.
From the tool's definition 'Type text into editable element' — triggers browser automation action that inputs text into a live web page, constituting an external operation whose effect depends on what element is targeted and what text is typed
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 YetiBrowser MCP, 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 text into editable element. It is categorised as a Execute tool in the YetiBrowser MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the YetiBrowser 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 YetiBrowser MCP. 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 YetiBrowser MCP server (yetidevworks/yetibrowser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from YetiBrowser MCP, 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.
17 YetiBrowser MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.