AI agents use draw_line 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.
This tool creates or modifies data (pixel art canvas) in a reversible manner. It does not execute arbitrary code, delete data irreversibly, or move money. While it changes canvas state, the modification is non-destructive and can be undone or overwritten. It falls squarely into the Write category as a creative modification tool.
From the tool's definition Tool name is 'draw_line' and description states 'Draw a line between two points'. This modifies pixel art canvas state by adding a visual element (a line) between coordinates.
Documented attack patterns abuse exactly the kind of access draw_line 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 draw_line:
{
"version": "1",
"default": "deny",
"tools": {
"draw_line": {
"limits": [
{
"counter": "draw_line_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}draw_line 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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Draw a line between two points. 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 draw_line: 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.
draw_line 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 draw_line 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 draw_line. 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.
draw_line 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.
Free to start. No card required.
45 Piskel MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.