Set the clipboard content in the isolated session.
AI agents use clipboard_set to create or update resources in Kwin — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Kwin environment.
This tool modifies clipboard content, which is a reversible write operation. It does not delete data (ruling out Destructive), execute arbitrary code (ruling out Execute), or involve financial transactions.
From the tool's definition Tool name 'clipboard_set' and description 'Set the clipboard content in the isolated session' indicate modification of system clipboard state, a reversible write operation.
Documented attack patterns abuse exactly the kind of access clipboard_set 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 clipboard_set:
{
"version": "1",
"default": "deny",
"tools": {
"clipboard_set": {
"limits": [
{
"counter": "clipboard_set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}clipboard_set stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Set the clipboard content in the isolated session. It is categorised as a Write tool in the Kwin MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Kwin MCP server in PolicyLayer and add a rule for clipboard_set: 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.
clipboard_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the clipboard_set 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 clipboard_set. 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.
clipboard_set 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.