AI agents invoke touch_pinch to trigger actions in Kwin. 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.
Given the server's purpose of automating desktop GUI interactions and sibling tools like keyboard_key, focus_window, and clipboard_set, 'touch_pinch' almost certainly simulates a touch pinch gesture on the desktop. This is an Execute-category action (triggering external UI operations), with high severity because automated GUI gestures can trigger arbitrary application actions.
From the tool's definition Tool name 'touch_pinch' on a server that automates Linux desktop GUI via Wayland; description is empty and uninformative.
Documented attack patterns abuse exactly the kind of access touch_pinch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kwin, and nothing reaches the server without passing your rules. This is the rule we recommend for touch_pinch:
{
"version": "1",
"default": "deny",
"tools": {
"touch_pinch": {
"limits": [
{
"counter": "touch_pinch_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}touch_pinch 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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touch_pinch. It is categorised as a Execute tool in the Kwin MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Kwin MCP server in PolicyLayer and add a rule for touch_pinch: 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 Kwin. Nothing to install.
touch_pinch 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 touch_pinch 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 touch_pinch. 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.
touch_pinch is provided by the Kwin MCP server (isac322/kwin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kwin, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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