asset-management

name	asset-management
display_name	Asset Discovery & Management
description	Import/export textures crash-safely, query the Content Browser selection, and check if an asset is open (AssetDiscoveryService). Search, load, save, move, rename, duplicate, and delete assets are handled by Unreal's native AssetTools toolset or EditorAssetLibrary. Use when the user asks to import an image from disk, export a texture, query the Content Browser selection, or check whether an asset is open in an editor.
vibeue_classes	["AssetDiscoveryService"]
unreal_classes	["EditorAssetLibrary","AssetRegistryHelpers"]

🧠 Brains complement: IF an unreal-engine-skills-manager tool (external MCP) exists in this session, call it with {action: "load", skill: "asset-management"} for UE domain knowledge on this topic — correct APIs, architecture, best practices — and treat it as the rubric for any review / "best practices" question. If no such tool is available (e.g. running under Claude Code or Codex without that MCP), skip this line entirely and proceed with this skill alone — do NOT attempt the call.

Asset Discovery & Management Skill

🔀 Engine owns general asset ops now. In the Unreal 5.8 consolidation, searching, loading, saving, moving, renaming, duplicating, and deleting assets moved to Unreal's native AssetTools toolset (reach it via call_tool; run describe_toolset for its actions) — or you can drive unreal.EditorAssetLibrary / unreal.AssetRegistryHelpers directly from execute_python_code. The old manage_asset MCP tool is GONE. VibeUE's AssetDiscoveryService was trimmed to only the crash-safe delta the engine doesn't provide:

Kept on AssetDiscoveryService	Purpose
import_asset(src, dest_folder, name) → (path, err)	Crash-safe image import (folder + name)
import_texture(src, dest_asset_path)	Crash-safe image import (full asset path)
export_texture(asset_path, file_path)	Export a texture to disk
get_primary_content_browser_selection() → AssetData or None	Primary Content Browser selection
is_asset_open(asset_path) → bool	Whether an asset is open in an editor

Everything else below (search_assets, list_assets_in_path, move_asset, duplicate_asset, delete_asset, save_asset, get_open_assets, get_asset_referencers, find_asset_by_path, asset_exists, …) was removed from AssetDiscoveryService — use the engine AssetTools toolset or EditorAssetLibrary / the Asset Registry.

Data Assets & Data Tables — no dedicated VibeUE service (issues #451, #452)

There is no DataAssetService / DataTableService. Drive them natively:

import unreal

# --- Data Assets (UPrimaryDataAsset / UDataAsset subclasses) ---
# Create: engine DataAssetTools toolset via call_tool (describe_toolset for the action), OR a factory.
da = unreal.load_asset("/Game/Data/DA_Thing")
val = da.get_editor_property("MyField")          # read
da.set_editor_property("MyField", 42)            # write — works for any UPROPERTY
unreal.EditorAssetLibrary.save_loaded_asset(da)

# --- Data Tables ---
dt = unreal.load_asset("/Game/Data/DT_Items")
names = unreal.DataTableFunctionLibrary.get_data_table_row_names(dt)   # row keys
# Read/write rows with the editor DataTable API:
#   unreal.DataTableFunctionLibrary.evaluate_curve_table_row(...) / get_data_table_column_as_string(dt, "Col")
# Engine DataTableTools (call_tool) covers add/remove/get rows + import/export CSV/JSON.

⚠️ Data Table gotchas (verified, #452): the row key ("Name") is reported as a column by some schema readers — it is the row id, not a data field. Writing a row with the wrong value type can be silently coerced — read the row back to confirm. There is no clear_rows; remove rows individually (engine DataTableTools) or re-import an empty CSV. An empty GameplayTag field serializes as "None".

Critical Rules

⚠️ Out-Params Become Return Values in Python — Never Pass an AssetData Argument

get_primary_content_browser_selection is shaped like bool Func(FAssetData& Out) in C++ and is exposed to Python as () -> AssetData or None. Passing an AssetData argument raises TypeError.

# WRONG - TypeError: takes no arguments (1 given)
asset = unreal.AssetData()
unreal.AssetDiscoveryService.get_primary_content_browser_selection(asset)

# CORRECT - call with no out-arg, check the return for None
asset = unreal.AssetDiscoveryService.get_primary_content_browser_selection()
if asset:
    print(asset.asset_name)

🔀 Where each operation lives now

Operation	Use
Search / find / list assets	engine AssetTools toolset via call_tool, or unreal.AssetRegistryHelpers.get_asset_registry()
Load / save / save-all	unreal.EditorAssetLibrary.load_asset / save_asset / save_directory, or AssetTools
Move / rename / duplicate / delete	unreal.EditorAssetLibrary.rename_asset (move), duplicate_asset, delete_asset, or AssetTools
Existence check	unreal.EditorAssetLibrary.does_asset_exist(path)
Referencers / dependencies	unreal.AssetRegistryHelpers.get_asset_registry().get_referencers(...)
Open an asset / list ALL open editors	Epic EditorAppToolset via call_tool (see below)
Import image from disk (crash-safe)	unreal.AssetDiscoveryService.import_asset / import_texture (stay on VibeUE — see below)
Export a texture to disk	unreal.AssetDiscoveryService.export_texture
Primary Content Browser selection	unreal.AssetDiscoveryService.get_primary_content_browser_selection()
Is an asset open in an editor	unreal.AssetDiscoveryService.is_asset_open(path)

🔀 ALL open assets / ALL selections / open an asset — use Epic's EditorAppToolset

VibeUE covers the single/primary queries above; the list-all and open operations live on Epic's native EditorToolset.EditorAppToolset (call via call_tool; returns {"returnValue": [...]} of package-path strings). These are NOT Python-bound — they only work through call_tool:

Need	Call
All assets open in editors	call_tool("GetOpenAssets", "EditorToolset.EditorAppToolset")
All Content Browser selections	call_tool("GetSelectedAssets", "EditorToolset.EditorAppToolset")
Open an asset in its editor	call_tool("OpenEditorForAsset", "EditorToolset.EditorAppToolset", {"assetPath": "/Game/.../BP_X"})

# "Show me all open Blueprints" = Epic GetOpenAssets + a type filter
opens = call_tool("GetOpenAssets", "EditorToolset.EditorAppToolset")["returnValue"]
bps = [p for p in opens if isinstance(unreal.load_asset(p), unreal.Blueprint)]

# "Open the selected asset" = VibeUE primary-selection + Epic OpenEditorForAsset
sel = unreal.AssetDiscoveryService.get_primary_content_browser_selection()
if sel:
    call_tool("OpenEditorForAsset", "EditorToolset.EditorAppToolset",
              {"assetPath": str(sel.package_name)})

🚨 Never list broad paths — a /Game listing can return 30,000+ assets

Listing every asset under /Game returns tens of thousands of entries and floods the conversation. Whether you go through the engine AssetTools toolset or EditorAssetLibrary.list_assets, always narrow first:

• Filter by a specific subfolder (e.g. /Game/Blueprints/HUD), and by class where supported.
• If you only need a count or sample, slice in Python before printing — never print the full array.

⚠️ EditorAssetLibrary Save Methods

There is no save_dirty_assets (AttributeError). The real options: unreal.EditorAssetLibrary.save_asset(path), save_directory(dir), save_loaded_asset(obj), save_loaded_assets([objs]). To save everything dirty, iterate or use the engine AssetTools toolset's save action.

⚠️ EditorAssetLibrary.list_assets Has No Class Filter

unreal.EditorAssetLibrary.list_assets(directory_path, recursive=True, include_folder=False) returns path strings only — there is no asset_class_names or any other class-filter kwarg (TypeError: invalid keyword argument). To list assets of one type, either filter the returned paths in Python (load each and check its class), or query the Asset Registry with a class filter via unreal.AssetRegistryHelpers.get_asset_registry().get_assets(...).

⚠️ UE 5.8 AssetData Property Names

get_primary_content_browser_selection() returns an AssetData. Read it with:

WRONG (old)	CORRECT
asset.name	asset.asset_name
asset.path	asset.package_path
asset.asset_class	asset.asset_class_path (a TopLevelAssetPath; compare .asset_name)
asset.object_path	f"{asset.package_name}.{asset.asset_name}"

AssetData has no object_path attribute (AttributeError). Build it from package_name + asset_name, or just use str(asset.package_name).

⚠️ Importing Image Files From Disk — Stay on AssetDiscoveryService

To bring an image file from disk into the Content Browser, use AssetDiscoveryService.import_asset (or import_texture). Do NOT call unreal.AssetToolsHelpers...import_asset_tasks or ImportAssets from execute_python_code — those pump the game-thread task graph and trip a RecursionGuard assertion that crashes the editor when run from inside a tool call. AssetDiscoveryService uses the texture factory's direct binary path, which is safe.

import unreal

# Crash-safe import (disk → Content Browser). Returns (asset_path, error); path is "" on failure.
path, err = unreal.AssetDiscoveryService.import_asset(
    "C:/Images/rocks.jpg", "/Game/UI/Textures", "T_Rocks")
print(path or err)

# WRONG — crashes the editor (TaskGraph RecursionGuard assertion)
# tasks = [unreal.AssetImportTask()]; unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks(tasks)

Supported image formats: png, jpg, jpeg, bmp, tga, dds, exr, hdr, tiff, tif, psd, pcx.

Need a source image to import? Editor screenshots live under the project's Saved/Screenshots (and Saved/VibeUE/Screenshots):

import os, unreal
shots = os.path.join(unreal.Paths.project_saved_dir(), "Screenshots")
print(os.listdir(shots) if os.path.isdir(shots) else "no screenshots yet")

⚠️ Asset Paths Must Be Content Browser Paths

Use /Game/... paths, not file system paths, everywhere except the disk side of import/export.

# WRONG - file system path
unreal.EditorAssetLibrary.does_asset_exist("C:/Projects/Content/BP_Player.uasset")

# CORRECT - content browser path
unreal.EditorAssetLibrary.does_asset_exist("/Game/Blueprints/BP_Player")

⚠️ Never Emulate Move/Rename with Duplicate + Delete

Duplicating creates a new asset identity. References stay pointed at the original, so deleting the original after a duplicate can break those references. Use a real move/rename (which fixes up references) instead:

import unreal

# EditorAssetLibrary.rename_asset performs a move + reference fixup
unreal.EditorAssetLibrary.rename_asset(
    "/Game/StateTree/STT_Rotate",
    "/Game/StateTree/Tasks/STT_Rotate")

(The engine AssetTools toolset exposes an equivalent move/rename action via call_tool.)

Creating Widget Blueprints

unreal.BlueprintService.create_blueprint(name, "UserWidget", path) creates a proper WidgetBlueprint (it detects UserWidget-derived parents and uses the UMG factory). For designing the widget afterwards (hierarchy, slots, bindings), load the umg-widgets skill.

---

Workflows

Search Pattern

Searching is an engine AssetTools job (via call_tool) — or query the Asset Registry directly:

import unreal

ar = unreal.AssetRegistryHelpers.get_asset_registry()

# All Blueprints under /Game (recursive). Use a class filter and a narrow path to avoid huge results.
f = unreal.ARFilter(
    package_paths=["/Game/Blueprints"],
    class_paths=[unreal.TopLevelAssetPath("/Script/Engine", "Blueprint")],
    recursive_paths=True)
for a in ar.get_assets(f)[:25]:
    print(f"{a.asset_name}: {a.package_path}")

Check Exists Pattern

import unreal

if unreal.EditorAssetLibrary.does_asset_exist("/Game/BP_Player"):
    print("Found")
else:
    print("Not found - create it")

Duplicate Pattern

import unreal

dup = unreal.EditorAssetLibrary.duplicate_asset("/Game/BP_Enemy", "/Game/BP_EnemyBoss")
if dup:
    print("Duplicated")

Move / Rename Pattern

import unreal

ok = unreal.EditorAssetLibrary.rename_asset(
    "/Game/StateTree/STT_Rotate",
    "/Game/StateTree/Tasks/STT_Rotate")
print("Moved (references fixed up)" if ok else "Move failed")

Save Pattern

import unreal

# Save a specific asset
unreal.EditorAssetLibrary.save_asset("/Game/BP_Player")

# Save a whole directory of dirty assets
unreal.EditorAssetLibrary.save_directory("/Game/Blueprints")

Check References Before Delete

Asset Registry referencer queries return package-name strings, not AssetData.

import unreal

ar = unreal.AssetRegistryHelpers.get_asset_registry()
refs = ar.get_referencers(
    "/Game/SM_Weapon",
    unreal.AssetRegistryDependencyOptions(include_hard_package_references=True))
if not refs:
    unreal.EditorAssetLibrary.delete_asset("/Game/SM_Weapon")
else:
    for ref in refs:          # ref is a package name, e.g. "/Game/Blueprints/BP_Player"
        print(f"In use by: {ref}")

Import / Export Textures (VibeUE — crash-safe)

import unreal

# Import (disk → Content Browser). Returns (asset_path, error); asset_path is "" on failure.
# Pass a destination FOLDER + optional asset name.
path, err = unreal.AssetDiscoveryService.import_asset(
    "C:/Textures/logo.png", "/Game/Textures", "T_Logo")
print(path or err)

# import_texture(src, dest_asset_path) takes a full asset path and uses the same crash-safe importer:
unreal.AssetDiscoveryService.import_texture("C:/Textures/logo.png", "/Game/Textures/T_Logo")

# Export (project → file system)
unreal.AssetDiscoveryService.export_texture("/Game/Textures/T_Logo", "C:/Exports/logo.png")

Editor State & Content Browser (VibeUE)

import unreal

# Is a specific asset open in an editor?
if unreal.AssetDiscoveryService.is_asset_open("/Game/BP_Player"):
    print("BP_Player is open")

# Primary Content Browser selection — NO out-arg, returns AssetData or None
asset = unreal.AssetDiscoveryService.get_primary_content_browser_selection()
if asset:
    print(f"Selected: {asset.asset_name} at {asset.package_path}")
    # Open it via the AssetEditorSubsystem (engine), loading the object first:
    obj = unreal.EditorAssetLibrary.load_asset(str(asset.package_name))
    unreal.get_editor_subsystem(unreal.AssetEditorSubsystem).open_editor_for_assets([obj])
else:
    print("Nothing selected")

For the full multi-selection set, open-editor lists, and search, use the engine AssetTools / AssetEditorSubsystem toolsets via call_tool.

Inspect the Selection's Class

asset.asset_class_path is a TopLevelAssetPath struct, not a string — compare its asset_name:

import unreal

asset = unreal.AssetDiscoveryService.get_primary_content_browser_selection()
if asset and str(asset.asset_class_path.asset_name) == "Blueprint":
    print(f"{asset.asset_name} is a Blueprint")

Create Non-Standard Asset Types (Factory Pattern)

Assets not covered by a VibeUE service (e.g., LandscapeGrassType) require AssetToolsHelpers + a factory. (The create_asset factory path is safe — only the import task-graph APIs crash.)

import unreal

asset_tools = unreal.AssetToolsHelpers.get_asset_tools()

factory = unreal.LandscapeGrassTypeFactory()
lgt = asset_tools.create_asset("LGT_MyGrass", "/Game/Landscape", unreal.LandscapeGrassType, factory)

# Set properties via set_editor_property, then save
unreal.EditorAssetLibrary.save_asset("/Game/Landscape/LGT_MyGrass")

Tip: Use discover_python_module("unreal", name_filter="Factory") to find available factories.

Common Asset Class Names for Filtering

• Blueprint, WidgetBlueprint
• Texture2D, Material, MaterialInstanceConstant
• StaticMesh, SkeletalMesh
• DataTable, PrimaryDataAsset
• LandscapeGrassType, LandscapeLayerInfoObject

Class names must match UE class names exactly (e.g., LandscapeGrassType, not GrassType). When a typed Asset Registry query unexpectedly returns 0, retry without the class filter and inspect each result's asset_class_path.asset_name to learn the real class name.

Sample scripts (run via execute_python_code)

• scripts/find_and_save.txt — find an asset (Asset Registry / EditorAssetLibrary) and duplicate + save it.