Blueprint Manipulation

ClaudeBridge provides 36 tools for working with Blueprints — from creating variables and functions to wiring complex node graphs.

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Workflow Overview

1. read_blueprint       → Understand the BP structure
2. analyze_graph        → See existing nodes and connections
3. Create/modify        → add_node, create_variable, create_function
4. Wire logic           → connect_pins
5. compile_blueprint    → Validate changes

Always Inspect First

Before modifying any Blueprint, use read_blueprint and analyze_graph to understand what already exists. UE may auto-create nodes like BeginPlay.

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Adding Nodes

The add_node tool supports 23+ node types:

Node Type	Description	Key Params
CallFunction	Call any UFUNCTION	function_class, function_name
Branch	If/Then/Else	—
Sequence	Execution sequence	—
Event	Standard event	event_name
VariableGet	Variable getter	variable_name
VariableSet	Variable setter	variable_name
Print	PrintString shorthand	message
DynamicCast	Cast to class	target_class
SpawnActorFromClass	Spawn actor	—
Timeline	Timeline node	timeline_name
MakeArray	Array literal	—
Knot	Reroute node	—

Example: Add Delay + Print

1. add_node(blueprint="BP_MyActor", node_type="CallFunction",
            function_class="KismetSystemLibrary", function_name="Delay")
2. set_node_property(node_name="...", pin_name="Duration", default_value="2.0")
3. add_node(node_type="Print", message="Delayed!")
4. connect_pins(source → Delay.execute, target → "then")
5. connect_pins(source → Delay.then, target → Print.execute)

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Pin Connections

Common Pin Names

Node Type	Input Pins	Output Pins
Events	—	then
CallFunction	execute, params	then, ReturnValue
Branch	execute, Condition	True, False
Sequence	execute	Then_0, Then_1, ...
VariableGet	—	variable name
VariableSet	execute, variable name	then

Connecting Pins

connect_pins(
    blueprint="BP_MyActor",
    source_node="K2Node_Event_0",
    source_pin="then",
    target_node="K2Node_CallFunction_0",
    target_pin="execute"
)

Node IDs

Node IDs (like K2Node_Event_0) are returned by add_node and visible in analyze_graph output. Always use the exact ID from the response.

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Variables

create_variable(blueprint="BP_MyActor", name="Health", type="float", default_value="100.0")
set_variable_properties(name="Health", instance_editable=true, category="Stats")

Supported types: bool, byte, int, int64, float, double, string, name, text, vector, rotator, transform, object

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Functions

create_function(blueprint="BP_MyActor", name="CalculateDamage")
add_function_input(function="CalculateDamage", param_name="BaseDamage", param_type="float")
add_function_output(function="CalculateDamage", param_name="FinalDamage", param_type="float")

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CallFunction Reference

The CallFunction node can invoke any UFUNCTION. Common classes:

Class	Common Functions
KismetSystemLibrary	PrintString, Delay, IsValid, LineTraceSingle
KismetMathLibrary	Add_FloatFloat, FClamp, RandomFloatInRange, Lerp
GameplayStatics	GetPlayerController, OpenLevel, SpawnActor
Actor	K2_GetActorLocation, K2_SetActorLocation, K2_DestroyActor

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Validation

After modifying a Blueprint, always compile:

compile_blueprint(blueprint="BP_MyActor")

For deeper validation:

validate_blueprint(blueprint="BP_MyActor")     → Check for issues
find_unused_variables(blueprint="BP_MyActor")   → Clean up