Pcg

What it does

When your agent uses it

• The user asks to build a PCG graph
• Add PCG nodes (Surface Sampler
• Static Mesh Spawner
• Place a PCGVolume and generate

Example prompts

• “/pcg”

Requirements

• Python 3

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

1. 1Volume Sampler input pin is "Volume", not "In" — add_edge(input_node, 'In', sampler_node, 'Volume'). Using 'In' silently no-ops and…
2. 2voxel_size is a Vector, not a float — set_editor_property('voxel_size', unreal.Vector(200, 200, 200)). Passing a float raises a TypeError.
3. 3graph property on PCGComponent is protected — use pcg_comp.set_graph(graph), never set_editor_property('graph', ...).
4. 4After modifying a graph, always: save → reload → reassign → generate — skipping reload means the component runs the old cached version.
5. 5Check for existing nodes before adding — always inspect [type(n.get_settings()).name for n in graph.nodes] first. Adding a node type that…
6. 6Always save AND reload after every change — call save_asset then reload_packages every time. Without the reload the PCG graph editor…
7. 7Use Volume Sampler for empty levels, not Surface Sampler — Surface Sampler requires geometry to sample from. An empty level has no…
8. 8Never spawn test actors to verify meshes or materials — do not use spawn_actor_from_class to place test cubes. Verify by checking ISM…

What it can do on your machine

Read from SKILL.md and the folder at commit dc051be. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 1 file in scripts/, which the agent can run.

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Pcg loads about 1.7k tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 506 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~86

When it runs · the whole SKILL.md, loaded when a task matches

~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from kevinpbuckley/VibeUE at commit dc051be, republished under its MIT licence (© kevinpbuckley). 506 words, ~1,710 tokens.

name

pcg

description

Create, inspect, and edit PCG Graph assets — add nodes, configure settings, connect pins, and wire procedural generation graphs (native PCG Python API). Use when the user asks to build a PCG graph, add PCG nodes (Surface Sampler, Static Mesh Spawner, filters), wire PCG pins, place a PCGVolume and generate, or set up procedural scattering.

display_name

Procedural Content Generation (PCG)

unreal_classes

PCGGraph, PCGNode, PCGEdge, PCGPin, PCGPinProperties, PCGSettings, PCGGraphFactory, PCGSurfaceSamplerSettings, PCGStaticMeshSpawnerSettings…

keywords

pcg, procedural, procedural content generation, pcg graph, pcg node, pcg pin, pcg edge, surface sampler, mesh spawner, static mesh spawner, point filter…

{ "Name": "PCG", "Enabled": true },
{ "Name": "PCGPythonInterop", "Enabled": true }

import unreal
assert hasattr(unreal, 'PCGGraph'), "PCG plugins not enabled — check .uproject"

import unreal

factory = unreal.PCGGraphFactory()
asset_tools = unreal.AssetToolsHelpers.get_asset_tools()
graph = asset_tools.create_asset('MyPCGGraph', '/Game/PCG', unreal.PCGGraph, factory)
unreal.EditorAssetLibrary.save_asset('/Game/PCG/MyPCGGraph')

import unreal

graph = unreal.EditorAssetLibrary.load_asset('/Game/PCG/MyPCGGraph')
# graph is a PCGGraph — access nodes, input_node, output_node directly

ar = unreal.AssetRegistryHelpers.get_asset_registry()
hits = ar.get_assets_by_class(unreal.TopLevelAssetPath("/Script/PCG", "PCGGraph"))

import unreal

# Surface Sampler node
node, settings = graph.add_node_of_type(unreal.PCGSurfaceSamplerSettings)
settings.set_editor_property('points_per_squared_meter', 5.0)
settings.set_editor_property('point_extents', unreal.Vector(50, 50, 50))
node.set_node_position(200, 0)

# Static Mesh Spawner node
spawner_node, spawner_settings = graph.add_node_of_type(unreal.PCGStaticMeshSpawnerSettings)
spawner_node.set_node_position(500, 0)

settings = node.get_settings()
settings.set_editor_property('unbounded', True)
print(settings.get_editor_property('points_per_squared_meter'))

for node in graph.nodes:
    print(type(node.get_settings()).__name__)

import unreal
node_types = sorted([x for x in dir(unreal) if x.endswith('Settings') and 'PCG' in x])
print(node_types)

© kevinpbuckley, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts) in Content/Skills/pcg of kevinpbuckley/VibeUE.

• SKILL.md
• reference.md
• scripts/build_pcg_graph.txt
• workflows.md

Open the folder on GitHubat commit dc051be