clipboard_get

THE RISK

Low Risk

Why clipboard_get needs a policy

This tool retrieves clipboard data without modifying, deleting, or executing anything. It has minimal blast radius—clipboard content may contain sensitive information but the tool itself performs no destructive or dangerous operations. It is purely informational.

From the tool's definition Tool name is 'clipboard_get' and description explicitly states 'Read the current clipboard content in the isolated session.' The verb 'Read' and the retrieval nature (get) confirm this is a read-only operation with no side effects.

Documented attack patterns abuse exactly the kind of access clipboard_get gives an agent:

POLICY

How to control clipboard_get

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_get:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "clipboard_get": {}
  }
}

clipboard_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Kwin — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about clipboard_get

What does the clipboard_get tool do? +

Read the current clipboard content in the isolated session. It is categorised as a Read tool in the Kwin MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on clipboard_get? +

Register the Kwin MCP server in PolicyLayer and add a rule for clipboard_get: 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.

What risk level is clipboard_get? +

clipboard_get is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit clipboard_get? +

Yes. Add a rate_limit block to the clipboard_get 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.

How do I block clipboard_get completely? +

Set action: deny in the PolicyLayer policy for clipboard_get. 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.

What MCP server provides clipboard_get? +

clipboard_get 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.

Enforce policy on every Kwin tool call.

Start from Kwin, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →