clipboard_write · Yaver MCP: Risk & Policy

WHAT IT DOES

What clipboard_write does on Yaver

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

PARAMETERS

Parameter	Type	Required	Description
`content`	string	Yes	Text to copy to clipboard

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why clipboard_write needs a policy

An AI agent can call clipboard_write faster than any human can review — one bad instruction and it creates or modifies resources in Yaver by the hundred, each call as confident as the last.

Risk signalsAccepts raw HTML/template content (content)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

clipboard_write Rate-limited

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": {
    "clipboard_write": {
      "limits": [
        {
          "counter": "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 Yaver, so you can run agents against it safely.

FAQ

Questions about clipboard_write

What does the clipboard_write tool do? +

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

What parameters does clipboard_write accept? +

clipboard_write accepts 1 parameter: content. Required: content. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on clipboard_write? +

Register the Yaver MCP server in PolicyLayer and add a rule for 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 Yaver. Nothing to install.

What risk level is clipboard_write? +

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

Can I rate-limit clipboard_write? +

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

Set action: deny in the PolicyLayer policy for 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 clipboard_write? +

clipboard_write is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.