list_nodes
Discover available ComfyUI nodes for workflow building by filtering nodes by name or category to identify components needed for automation tasks.
Instructions
List available ComfyUI nodes.
Args:
filter: Optional string to match node names (case-insensitive)
category: Optional category filter (exact match)
Returns a sorted list of node class names.
Use this to discover available nodes for workflow building.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| filter | No | Filter by name (e.g., 'fal', 'image') | |
| category | No | Filter by category |
Implementation Reference
- Core implementation of the list_nodes MCP tool. Filters and returns sorted list of available ComfyUI node names using cached data.
@mcp.tool() def list_nodes( filter: str = Field(default=None, description="Filter by name (e.g., 'fal', 'image')"), category: str = Field(default=None, description="Filter by category"), ctx: Context = None, ) -> list: """List available ComfyUI nodes. Args: filter: Optional string to match node names (case-insensitive) category: Optional category filter (exact match) Returns a sorted list of node class names. Use this to discover available nodes for workflow building. """ if ctx: ctx.info(f"Listing nodes{' matching: ' + filter if filter else ''}...") try: nodes = get_cached_nodes() result = [] for name, info in nodes.items(): if filter and filter.lower() not in name.lower(): continue if category and info.get("category", "").lower() != category.lower(): continue result.append(name) return sorted(result) except Exception as e: return [f"Error: {e}"] - Input schema defined using Pydantic Field for the filter (optional name filter) and category (optional exact category match) parameters.
filter: str = Field(default=None, description="Filter by name (e.g., 'fal', 'image')"), category: str = Field(default=None, description="Filter by category"), ctx: Context = None, - src/comfy_mcp_server/tools/__init__.py:26-26 (registration)Registers the discovery tools (including list_nodes) by calling register_discovery_tools during overall tool registration.
register_discovery_tools(mcp) - src/comfy_mcp_server/__init__.py:92-92 (registration)Top-level registration of all MCP tools, which chains to list_nodes registration.
register_all_tools(mcp) - Uses get_cached_nodes() helper from api.py to fetch node data efficiently.
nodes = get_cached_nodes()