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ComfyUI-GPU-Optimizer

ComfyUI-GPU-Optimizer

by mwaight
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

gpu_offload_model

Free up GPU memory by offloading a model from GPU to CPU. Specify which model to offload using its index, or offload the largest model with -1.

Instructions

Move a specific model from GPU to CPU by index. Use gpu_memory_map to see model indices. Pass -1 to offload the largest model.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "gpu_offload_model"
  }
}

Input Schema

NameRequiredDescriptionDefault
model_indexNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.2/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations exist, so description must cover behavior. It states the action and default index meaning, but doesn't mention that offloading frees GPU memory or what happens if index is invalid. Adequate but not thorough for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, 18 words. Purpose first, then usage hint. No fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple tool with one optional parameter, the description covers purpose, how to find indices, and special value. Lacks return value info but acceptable given simplicity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 0% coverage; description adds critical context: 'by index' and explains the default -1 offloads the largest model, which goes beyond schema fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states the action (move model) and target (from GPU to CPU by index). Distinguishes from sibling tools like gpu_flush_models and gpu_memory_map by specifying 'by index'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides direct guidance: use gpu_memory_map to find indices, and the special value -1 to offload the largest model. Does not explicitly state when not to use, but context is clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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