AI agents invoke mouse_button_up 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.
Based on the server context (desktop GUI automation) and the tool name, this tool likely releases a mouse button, which is a desktop interaction/execution action. Empty description lowers confidence. In a GUI automation context, mouse actions can trigger arbitrary application behaviors, making misuse potentially high-severity. Categorized as Execute since it triggers external UI operations.
From the tool's definition Tool name 'mouse_button_up' on a server that automates Linux desktop GUI via Wayland/KWin sessions; description is empty.
Documented attack patterns abuse exactly the kind of access mouse_button_up 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 mouse_button_up:
{
"version": "1",
"default": "deny",
"tools": {
"mouse_button_up": {
"limits": [
{
"counter": "mouse_button_up_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}mouse_button_up 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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mouse_button_up. 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 mouse_button_up: 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.
mouse_button_up 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 mouse_button_up 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 mouse_button_up. 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.
mouse_button_up 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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30 Kwin tools catalogued and risk-classified — across an index of 43,000+ MCP servers.