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Server Configuration

Describes the environment variables required to run the server.

NameRequiredDescriptionDefault
COMFYUI_URLNoComfyUI server URLhttp://127.0.0.1:8188
COMFY_API_KEYNoComfy.org API key for cloud API nodes
COMFYUI_TIMEOUTNoMax wait time for job completion (seconds)300
COMFYUI_MCP_HOSTNoHost for HTTP transport127.0.0.1
COMFYUI_MCP_PORTNoPort for HTTP transport8200
COMFYUI_MCP_TRANSPORTNoTransport mode: stdio or streamable-httpstdio
COMFYUI_POLL_INTERVALNoPolling interval for job status (seconds)1.0

Capabilities

Features and capabilities supported by this server

CapabilityDetails
tools
{
  "listChanged": true
}
logging
{}
prompts
{
  "listChanged": false
}
resources
{
  "subscribe": false,
  "listChanged": false
}
extensions
{
  "io.modelcontextprotocol/ui": {}
}
experimental
{}

Tools

Functions exposed to the LLM to take actions

NameDescription
get_queueA

Get the current ComfyUI queue with running and pending items.

clear_queueA

Clear all pending items from the ComfyUI queue.

cancel_jobA

Cancel the currently running ComfyUI job.

get_historyB

Get ComfyUI execution history.

get_system_statsA

Get ComfyUI system information including OS, RAM, VRAM, and device info.

get_job_statusB

Get the status and outputs of a queued ComfyUI job.

get_result_imagesA

Get all output images from a completed ComfyUI job.

wait_for_jobsA

Wait for multiple queued jobs to complete and return all results.

Use this after queueing multiple jobs with queue_only=true to wait for all of them at once, enabling parallel execution.

copy_output_to_inputA

Copy a file from ComfyUI's output directory to input directory.

Makes generated files (images, videos, audio) available as inputs for subsequent workflows. For example, copy a generated image to use it in image_to_image, image_to_video, or run_api_node.

list_filesB

List files in a ComfyUI directory.

delete_history_itemsA

Delete specific items from ComfyUI execution history.

delete_queue_itemsB

Delete specific items from the ComfyUI queue.

get_model_metadataA

Get metadata from a safetensors model file.

Useful for inspecting what a model was trained on, its configuration, resolution, license, etc.

get_featuresA

Get ComfyUI server feature flags and capabilities.

Returns: Dict of supported features (preview metadata, max upload size, extensions, node replacements, etc.).

get_logsA

Get recent ComfyUI server log entries for debugging.

list_modelsB

List available models in ComfyUI.

list_samplers_and_schedulersA

List all available sampler algorithms and noise schedulers.

Returns a dict with 'samplers' and 'schedulers' lists.

free_memoryC

Free ComfyUI VRAM and RAM.

text_to_imageB

Generate images from a text description.

All parameters except prompt are optional with sensible defaults. Change any parameter to customize the generation.

image_to_imageB

Transform an existing image guided by a text prompt.

All parameters except prompt and input_image are optional with sensible defaults. Change any parameter to customize.

upscale_imageC

Upscale an image using an AI upscaling model.

inpaintA

Fill in masked regions of an image with AI-generated content.

All parameters except prompt, input_image, and mask_image are optional with sensible defaults. Change any parameter to customize.

text_to_videoA

Generate a video from a text description using LTX-Video (local model).

All parameters except prompt are optional with sensible defaults. Change any parameter to customize. For cloud-based video generation, use sora_video_generate() or run_api_node() with Kling/Runway/Luma/etc.

image_to_videoA

Generate a video from an image using LTX-Video (local model).

All parameters except prompt and input_image are optional with sensible defaults. Change any parameter to customize. For cloud-based I2V, use sora_video_generate(input_image=...) or run_api_node() with Kling/Runway/Luma/etc.

dalle3_imageA

Generate an image using DALL-E 3 via Comfy.org API.

All parameters except prompt are optional. Requires COMFY_API_KEY. For other API providers, use run_api_node() with list_api_nodes().

gpt_image_generateA

Generate or edit an image using GPT Image via Comfy.org API.

Can generate from text alone, or edit an existing image with a prompt. All parameters except prompt are optional. Requires COMFY_API_KEY.

sora_video_generateA

Generate a video using Sora 2 via Comfy.org API.

Can generate from text alone, or animate an existing image. All parameters except prompt are optional. Requires COMFY_API_KEY.

merge_videosA

Merge multiple videos into a single video.

Decomposes each video into frames and audio, batches the frames together, combines the audio tracks, and reassembles into one video.

flux_text_to_imageA

Generate images using Flux (local model).

All parameters except prompt are optional with sensible defaults. Auto-detects installed Flux model (GGUF or safetensors) and CLIP encoders. Produces high-quality 1024x1024 images by default.

wan_text_to_videoA

Generate video from text using Wan 2.2 (local model).

All parameters except prompt are optional with sensible defaults. Auto-detects installed Wan model and UMT5-XXL text encoder.

wan_image_to_videoA

Generate video from an image using Wan 2.2 (local model).

All parameters except prompt and input_image are optional with sensible defaults. Auto-detects installed Wan model and encoder.

upload_imageA

Upload a local image file to ComfyUI's input directory.

upload_maskA

Upload a mask image to ComfyUI's input directory.

The mask is processed to extract the alpha channel for use with inpainting workflows. White areas in the mask will be inpainted.

get_image_urlB

Get the URL to view or download a ComfyUI image/video/audio.

create_workflowB

Create a new workflow, optionally from a template.

add_nodeA

Add a node to a workflow with auto-connection of typed inputs.

set_inputsB

Update inputs on an existing workflow node.

remove_nodeA

Remove a node from a workflow and clean up dangling connections.

get_workflowA

Get the full workflow graph state with type information.

validate_workflowA

Validate a workflow for correctness without executing it.

Checks: all node class_types exist, required inputs connected, connection type compatibility, output node exists.

execute_workflowB

Execute a workflow that was built with builder tools.

search_nodesA

Search ComfyUI nodes by name, category, or input/output type.

get_node_schemaA

Get the full input/output schema for a ComfyUI node class.

suggest_nextA

Analyze a workflow and suggest next steps.

Checks for unconnected inputs, unused outputs, missing output nodes, and provides context-aware suggestions.

run_api_nodeA

Run any ComfyUI node in a single call.

Builds a minimal workflow around the node, auto-inserting loader and save nodes as needed. Works with all 200+ API nodes (Kling, Runway, Luma, Stability, ElevenLabs, Gemini, etc.) and any built-in node.

Workflow: discover nodes with list_api_nodes() or search_nodes(), check inputs with get_node_schema(), then run with this tool.

For IMAGE/VIDEO/AUDIO-typed inputs, pass a filename string (e.g. "photo.png") and a LoadImage/LoadVideo/LoadAudio node is auto-inserted.

list_api_nodesA

List available API nodes (Kling, Runway, Luma, Stability, ElevenLabs, etc.).

These are cloud-based nodes that run via the Comfy.org API proxy. Use get_node_schema(name) to see full input/output details, then run_api_node(name, inputs) to execute.

Prompts

Interactive templates invoked by user choice

NameDescription

No prompts

Resources

Contextual data attached and managed by the client

NameDescription
resource_modelsList available model folder types (checkpoints, loras, vae, etc.).
resource_nodesList all available node class names.
resource_system_statsGet ComfyUI system stats (OS, RAM, VRAM, devices).
resource_queueGet current queue status.
resource_historyGet recent execution history (last 20 items).

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