AI agents use unpin_item to create or update resources in Maccy Clipboard MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Maccy Clipboard MCP environment.
Unpinning a clipboard item modifies the item's pinned state (a reversible metadata change). It does not delete or destroy data — the item remains in clipboard history, just without the pinned flag. This is a reversible modification, placing it in the Write category.
From the tool's definition Unpin a clipboard item
Documented attack patterns abuse exactly the kind of access unpin_item gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Maccy Clipboard MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for unpin_item:
{
"version": "1",
"default": "deny",
"tools": {
"unpin_item": {
"limits": [
{
"counter": "unpin_item_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unpin_item 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.
Free to start. No card required.
Unpin a clipboard item. It is categorised as a Write tool in the Maccy Clipboard MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Maccy Clipboard MCP server in PolicyLayer and add a rule for unpin_item: 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 Maccy Clipboard MCP. Nothing to install.
unpin_item 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 unpin_item 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 unpin_item. 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.
unpin_item is provided by the Maccy Clipboard MCP server (vlad-ds/maccy-clipboard-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Maccy Clipboard MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
8 Maccy Clipboard MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.