AI agents use duplicate_frame to create or update resources in Piskel MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Piskel MCP Server environment.
The tool creates a new frame by duplicating an existing one, which is a reversible write operation. While this modifies project state by adding data, it does not delete, overwrite irreversibly, execute arbitrary code, move money, or have severe blast radius. Duplicating frames in pixel art projects is a normal, recoverable authoring operation.
From the tool's definition Tool performs 'Duplicate a frame', creating a new copy of an existing animation frame within a Piskel project. This is explicitly a create/modify operation that adds new data reversibly.
Documented attack patterns abuse exactly the kind of access duplicate_frame gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Piskel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for duplicate_frame:
{
"version": "1",
"default": "deny",
"tools": {
"duplicate_frame": {
"limits": [
{
"counter": "duplicate_frame_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}duplicate_frame 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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Duplicate a frame. It is categorised as a Write tool in the Piskel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Piskel MCP Server MCP server in PolicyLayer and add a rule for duplicate_frame: 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 Piskel MCP Server. Nothing to install.
duplicate_frame 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 duplicate_frame 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 duplicate_frame. 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.
duplicate_frame is provided by the Piskel MCP Server MCP server (yafeiaa/piskel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Piskel MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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45 Piskel MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.