vex

vex

MCP tool wrappers for Houdini VEX operations.

Each tool delegates to the corresponding handler running inside Houdini via the HTTP bridge.

Functions:

Name	Description
create_vex_expression	Set a VEX expression on a parameter.
create_wrangle	Create an Attribute Wrangle node with VEX code.
get_wrangle_code	Read the VEX code from an Attribute Wrangle node.
set_wrangle_code	Set VEX code on an existing Attribute Wrangle node.
validate_vex	Validate VEX code by cooking the node and checking for errors.

Functions:

create_vex_expression async

create_vex_expression(
    ctx: Context, node_path: str, parm_name: str, vex_code: str
) -> dict

Set a VEX expression on a parameter.

Parameters:

Name	Type	Description	Default
node_path	str	Path to the node.	required
parm_name	str	Parameter name.	required
vex_code	str	VEX expression code.	required

create_wrangle async

create_wrangle(
    ctx: Context,
    parent_path: str,
    vex_code: str,
    justification: str,
    run_over: str = "Points",
    name: Optional[str] = None,
) -> dict

Create an Attribute Wrangle node with VEX code.

LAST RESORT. VEX is for attribute math that no node expresses — NEVER for modeling, scattering, copying, deforming, grouping, or randomizing, which all have dedicated nodes. Building geometry in a wrangle when a native node exists is a failure, not a shortcut.

The justification parameter is mandatory: state which list_node_types searches you ran and why none of the results can do this. If you cannot write that sentence honestly, you have not checked — check first.

Parameters:

Name	Type	Description	Default
parent_path	str	Parent SOP network path.	required
vex_code	str	VEX snippet to set.	required
justification	str	Which native nodes you checked (the actual list_node_types filters used) and why none can express this logic.	required
run_over	str	Element to run over ("Points", "Vertices", "Primitives", "Detail", "Numbers").	'Points'
name	Optional[str]	Node name.	None

get_wrangle_code async

get_wrangle_code(ctx: Context, node_path: str) -> dict

Read the VEX code from an Attribute Wrangle node.

Parameters:

Name	Type	Description	Default
node_path	str	Path to the wrangle node.	required

set_wrangle_code async

set_wrangle_code(ctx: Context, node_path: str, vex_code: str) -> dict

Set VEX code on an existing Attribute Wrangle node.

Parameters:

Name	Type	Description	Default
node_path	str	Path to the wrangle node.	required
vex_code	str	VEX snippet to set.	required

validate_vex async

validate_vex(ctx: Context, node_path: str) -> dict

Validate VEX code by cooking the node and checking for errors.

Parameters:

Name	Type	Description	Default
node_path	str	Path to the wrangle node.	required