ComfyUI MCP
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| COMFYUI_URL | No | ComfyUI base URL | http://127.0.0.1:8188 |
| COMFYUI_API_KEY | No | API key sent to ComfyUI | |
| COMFYUI_MCP_HOST | No | HTTP bind host | 127.0.0.1 |
| COMFYUI_MCP_PORT | No | HTTP bind port | 8000 |
| COMFYUI_API_PREFIX | No | Prefix native routes; use /api for compatible cloud endpoints | |
| COMFYUI_VERIFY_SSL | No | Verify the ComfyUI HTTPS certificate | true |
| COMFYUI_MCP_DATA_DIR | No | Workflow and output storage | |
| COMFYUI_MCP_TRANSPORT | No | stdio, streamable-http, or sse | stdio |
| COMFYUI_API_KEY_HEADER | No | Header used for the API key | X-API-Key |
| COMFYUI_ACCOUNT_API_KEY | No | Key placed in extra_data for paid Comfy API nodes | |
| COMFYUI_MCP_INPUT_ROOTS | No | Allowed upload roots, separated by the OS path separator | |
| COMFYUI_TIMEOUT_SECONDS | No | HTTP request timeout | 30 |
| COMFYUI_MCP_ALLOW_REMOTE | No | Permit non-loopback MCP HTTP binding | false |
| COMFYUI_MCP_BRIDGE_TOKEN | No | Shared token for the optional canvas bridge |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": false
} |
| prompts | {
"listChanged": false
} |
| resources | {
"subscribe": false,
"listChanged": false
} |
| experimental | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| comfyui_healthA | Check ComfyUI connectivity and whether the optional canvas bridge is installed. |
| comfyui_list_node_typesA | Search installed core and custom node types without returning the full large schema. |
| comfyui_get_node_typeA | Get the authoritative inputs, outputs, options, and metadata for one node class. |
| comfyui_list_modelsA | List ComfyUI model folders, or models within one folder such as checkpoints or loras. |
| comfyui_list_templatesA | List workflow templates exposed by installed ComfyUI node packages. |
| comfyui_list_workflowsA | List workflows managed by this MCP server with revision and node counts. |
| comfyui_create_workflowC | Create an empty managed API-format workflow. |
| comfyui_import_workflowB | Import a ComfyUI API-format workflow object into the managed workflow store. |
| comfyui_get_workflowA | Read a managed workflow. Set include_graph=false for a compact summary. |
| comfyui_add_nodeC | Add a node to a managed workflow, optionally checking it against the live ComfyUI. |
| comfyui_remove_nodeA | Remove a node; force=true also disconnects inputs that reference the node. |
| comfyui_set_inputB | Set a literal node input such as prompt text, seed, dimensions, or model name. |
| comfyui_connect_nodesB | Connect one node output index to a named input on another node. |
| comfyui_disconnect_inputB | Remove the node connection currently assigned to an input. |
| comfyui_validate_workflowB | Validate graph structure and, by default, installed node schemas and required inputs. |
| comfyui_run_workflowB | Submit a managed workflow to ComfyUI, with optional non-persistent input overrides. |
| comfyui_get_runB | Get a run's pending, running, completed, failed, or unknown status and outputs. |
| comfyui_get_queueA | Inspect running and pending jobs; full workflow payloads are hidden by default. |
| comfyui_interruptA | Interrupt the workflow currently executing in ComfyUI. |
| comfyui_clear_queueA | Remove pending workflows from the ComfyUI queue. |
| comfyui_upload_imageB | Upload an allowed local image to ComfyUI for LoadImage-style nodes. |
| comfyui_download_outputC | Download a generated ComfyUI file into this server's managed output directory. |
| comfyui_sync_canvasC | Render a managed API workflow on an open ComfyUI canvas via the optional bridge. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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