Add a file to CleanShot
AI agents use cleanshot_add_quick_access_overlay to create or update resources in Cleanshot — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Cleanshot environment.
The tool modifies CleanShot's state by adding a file to its quick access overlay. While the operation is reversible (files can be removed), it does alter application data and could allow an agent to inject unintended files into the user's quick access system. This constitutes a Write operation (create/modify) rather than mere Read (which would be listing or retrieving existing files).
From the tool's definition Tool description states 'Add a file to CleanShot' — this creates/adds new content to the application's storage or quick access system, a reversible modification operation typical of Write category.
Documented attack patterns abuse exactly the kind of access cleanshot_add_quick_access_overlay gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cleanshot, and nothing reaches the server without passing your rules. This is the rule we recommend for cleanshot_add_quick_access_overlay:
{
"version": "1",
"default": "deny",
"tools": {
"cleanshot_add_quick_access_overlay": {
"limits": [
{
"counter": "cleanshot_add_quick_access_overlay_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}cleanshot_add_quick_access_overlay 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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Add a file to CleanShot. It is categorised as a Write tool in the Cleanshot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cleanshot MCP server in PolicyLayer and add a rule for cleanshot_add_quick_access_overlay: 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 Cleanshot. Nothing to install.
cleanshot_add_quick_access_overlay 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 cleanshot_add_quick_access_overlay 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 cleanshot_add_quick_access_overlay. 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.
cleanshot_add_quick_access_overlay is provided by the Cleanshot MCP server (jdorfman/cleanshot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cleanshot, 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.
19 Cleanshot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.