AI agents call list_sketches to retrieve information from MCP Arduino Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Listing sketches retrieves information about existing Arduino sketches without creating, modifying, deleting, or executing any code. This is a simple data retrieval operation with minimal risk. The low severity reflects that sketch metadata enumeration poses no significant security threat.
From the tool's definition Tool name 'list_sketches' indicates a listing/enumeration operation with no modification capability. The 'list_' prefix is consistent with other Read tools on this server like 'list_boards', 'list_cores', and 'list_installed_libraries'.
Documented attack patterns abuse exactly the kind of access list_sketches gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Arduino Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sketches:
{
"version": "1",
"default": "deny",
"tools": {
"list_sketches": {}
}
}list_sketches is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_sketches. It is categorised as a Read tool in the MCP Arduino Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Arduino Server MCP server in PolicyLayer and add a rule for list_sketches: 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 MCP Arduino Server. Nothing to install.
list_sketches 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_sketches 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_sketches. 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_sketches is provided by the MCP Arduino Server MCP server (volt23/mcp-arduino-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Arduino 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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21 MCP Arduino Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.