sdk_clipboard_write · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What sdk_clipboard_write does on UI Bridge MCP

AI agents use sdk_clipboard_write to create or update resources in UI Bridge MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UI Bridge MCP environment.

WHY IT NEEDS A POLICY

Why sdk_clipboard_write needs a policy

This tool writes data to the system clipboard, which is a reversible modification. The clipboard content can be overwritten or cleared, and clipboard operations do not permanently destroy data or commit financial transactions. While clipboard access can be misused (e.g., to inject malicious content into paste operations), the operation itself is Write-category.

From the tool's definition Tool name 'sdk_clipboard_write' and description 'Write text to the system clipboard (SDK mode)' explicitly indicate a write operation that modifies system clipboard state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sdk_clipboard_write Rate-limited

sdk_clipboard_write 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sdk_clipboard_write": {
      "limits": [
        {
          "counter": "sdk_clipboard_write_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches UI Bridge MCP, so you can run agents against it safely.

FAQ

Questions about sdk_clipboard_write

What does the sdk_clipboard_write tool do? +

Write text to the system clipboard (SDK mode). It is categorised as a Write tool in the UI Bridge MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sdk_clipboard_write? +

Register the UI Bridge MCP server in PolicyLayer and add a rule for sdk_clipboard_write: 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 UI Bridge MCP. Nothing to install.

What risk level is sdk_clipboard_write? +

sdk_clipboard_write is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sdk_clipboard_write? +

Yes. Add a rate_limit block to the sdk_clipboard_write 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 sdk_clipboard_write completely? +

Set action: deny in the PolicyLayer policy for sdk_clipboard_write. 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 sdk_clipboard_write? +

sdk_clipboard_write is provided by the UI Bridge MCP server (qontinui/ui-bridge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.