AI agents use swap_frames 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.
Swapping frames is a Write operation because it modifies the animation sequence structure reversibly. While the blast radius is limited (animation frame reordering within a project), an AI agent could accidentally corrupt animation timing or sequence logic, warranting medium severity.
From the tool's definition Tool description states 'Swap two frames in the animation sequence' - this reorders existing frames but does not delete or create new data, making it a reversible modification operation.
Documented attack patterns abuse exactly the kind of access swap_frames 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 swap_frames:
{
"version": "1",
"default": "deny",
"tools": {
"swap_frames": {
"limits": [
{
"counter": "swap_frames_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}swap_frames 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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Swap two frames in the animation sequence. 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 swap_frames: 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.
swap_frames 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 swap_frames 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 swap_frames. 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.
swap_frames 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.