Get current effective defaults for image, audio, and video generation. Returns merged defaults from all sources (runtime, config, env, hardcoded). Shows what values will be used when parameters are not explicitly provided.
AI agents call get_defaults 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.
This tool only retrieves and displays configuration information about defaults for generation parameters. It does not modify, execute, delete, or perform any operations that would change system state or trigger external actions. The scope is limited to reading merged defaults from various sources and presenting them to the user.
From the tool's definition Tool description states it "Get[s] current effective defaults" and "Shows what values will be used". The verb "Get" and the retrieval nature of querying configuration defaults indicate a read-only operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_defaults 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 get_defaults:
{
"version": "1",
"default": "deny",
"tools": {
"get_defaults": {}
}
}get_defaults is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get current effective defaults for image, audio, and video generation. Returns merged defaults from all sources (runtime, config, env, hardcoded). Shows what values will be used when parameters are not explicitly provided. 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 get_defaults: 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.
get_defaults 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 get_defaults 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 get_defaults. 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.
get_defaults 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.
Free to start. No card required.
15 ComfyUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.