AI agents call list_assets to retrieve information from ComfyUI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves or enumerates assets without modifying, deleting, or executing operations. This is a passive read operation typical of inventory queries. The empty description prevents higher confidence, but the verb 'list' combined with the Read-oriented sibling tools (get_asset_metadata, get_defaults, get_job, get_queue_status, list_models, list_workflows) indicates this is purely informational.
From the tool's definition Tool name 'list_assets' indicates a listing/retrieval operation with no side effects. Description is empty, which lowers confidence slightly, but the naming convention and context (sibling tools include get_* and list_* operations) strongly suggests data…
Documented attack patterns abuse exactly the kind of access list_assets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ComfyUI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_assets:
{
"version": "1",
"default": "deny",
"tools": {
"list_assets": {}
}
}list_assets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_assets. It is categorised as a Read tool in the ComfyUI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ComfyUI MCP Server MCP server in PolicyLayer and add a rule for list_assets: 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 ComfyUI MCP Server. Nothing to install.
list_assets 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_assets 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_assets. 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_assets is provided by the ComfyUI MCP Server MCP server (joenorton/comfyui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ComfyUI 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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15 ComfyUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.