AI agents call list_palettes to retrieve information from Piskel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and retrieves palette information. It has no side effects, does not modify data, execute code, delete content, or involve financial operations. It is a straightforward read operation that fits the 'Read' category with low severity since exposure of palette data poses minimal risk to an AI agent.
From the tool's definition Tool name 'list_palettes' and description 'List all custom palettes and available presets' indicate retrieval of existing palette data without modification, deletion, or execution of code.
Documented attack patterns abuse exactly the kind of access list_palettes 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 list_palettes:
{
"version": "1",
"default": "deny",
"tools": {
"list_palettes": {}
}
}list_palettes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all custom palettes and available presets. It is categorised as a Read tool in the Piskel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Piskel MCP Server MCP server in PolicyLayer and add a rule for list_palettes: 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.
list_palettes is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_palettes 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 list_palettes. 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.
list_palettes 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.