🧠 Brains complement: IF an unreal-engine-skills-manager tool (external MCP) exists in this session, call it with {action: "load", skill: "gameplay-tags"} 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.

Gameplay Tags Skill

Manage Unreal Engine Gameplay Tags. Core CRUD (add / remove / rename / list) is now owned by Unreal 5.8's native GameplayTagsToolset (call it via call_tool). VibeUE keeps only the delta the engine toolset does NOT provide — runtime hierarchy queries and bulk registration: unreal.GameplayTagService.has_tag / get_tag_info / get_children / add_tags.

Tags are written to INI config and registered at runtime — they appear immediately in the editor tag picker without restart.

Critical Rules

🔀 Where each operation lives

Operation	Use
Add / remove / rename a single tag, list all tags	engine GameplayTagsToolset via call_tool (run describe_toolset for its action names/params)
Bulk-register many tags at once	unreal.GameplayTagService.add_tags([...], comment, source)
Check existence	unreal.GameplayTagService.has_tag(name)
Detailed info (comment/source/redirect/child count)	unreal.GameplayTagService.get_tag_info(name)
Direct children of a tag	unreal.GameplayTagService.get_children(parent)

The single-tag add_tag / remove_tag / rename_tag / list_tags helpers were removed from GameplayTagService in the 5.8 consolidation — use the engine GameplayTagsToolset for those. VibeUE's add_tags remains for registering several tags in one call.

⚠️ Do NOT Use ProjectSettingsService for Gameplay Tags

ProjectSettingsService.set_ini_value() writes to GConfig memory but does NOT register tags with UGameplayTagsManager. Tags created this way will not appear in tag pickers or dropdowns.

Use the engine GameplayTagsToolset (single-tag CRUD) or unreal.GameplayTagService.add_tags (bulk) for gameplay tag operations.

⚠️ Tag Names Use Dot Hierarchy

Tags use dot-separated hierarchy: Category.Subcategory.TagName

# ✅ CORRECT
unreal.GameplayTagService.add_tags(["Cube.StartChasing"])
unreal.GameplayTagService.add_tags(["Ability.Fireball.Cast"])

# ❌ WRONG - don't use spaces or special characters
unreal.GameplayTagService.add_tags(["Cube Start Chasing"])

⚠️ Default Source is DefaultGameplayTags.ini

Tags default to DefaultGameplayTags.ini source. This is the standard project-level tag source. You can specify a different source if needed, but the default is correct for most cases.

⚠️ Check Results

result = unreal.GameplayTagService.add_tags(["Cube.StartChasing"], "Event to start chasing")
if not result.success:
    print(f"Failed: {result.error_message}")

⚠️ Renames Register a Redirect — has_tag(old_name) Stays True

Renaming a tag (via the engine GameplayTagsToolset) updates the INI and registers a tag redirect so existing assets keep resolving the old name. Consequences:

• has_tag(old_name) returns True after a rename — that is the redirect, not a failed rename.
• get_tag_info(old_name) describes the redirect target; check its redirected_to field (non-empty = the requested name is a redirect, the value is the new canonical name).
• Verify a rename with the engine toolset's list action or get_children(parent) — the old name will be gone from those listings — or check get_tag_info(old_name).redirected_to.

⚠️ get_tag_info Returns a Struct or None — NOT a Tuple

# ❌ WRONG — raises "cannot unpack non-iterable GameplayTagInfo"
found, info = unreal.GameplayTagService.get_tag_info("Cube.StartChasing")

# ✅ CORRECT
info = unreal.GameplayTagService.get_tag_info("Cube.StartChasing")
if info is not None:
    print(info.tag_name, info.comment)

---

Workflows

Add Tags for StateTree Events

When a StateTree transition needs OnEvent trigger, create the event tags first:

import unreal

# 1. Create the gameplay tags
result = unreal.GameplayTagService.add_tags(
    ["Cube.StartChasing", "Cube.StopChasing"],
    "StateTree chase events"
)
print(f"Added {len(result.tags_modified)} tags: {result.tags_modified}")

# 2. Now use them in StateTree transitions (via StateTreeService)

Add a Single Tag

Single-tag add lives in the engine GameplayTagsToolset — call it with call_tool (run describe_toolset on it for the exact action name and parameters). For one-or-many in a single call from Python, add_tags also accepts a single-element list:

import unreal

result = unreal.GameplayTagService.add_tags(
    ["Ability.Fireball.Cast"],
    "Triggered when player casts fireball"
)
if result.success:
    print(f"Tag added: {result.tags_modified[0]}")

List All Tags (with Filter)

Listing/filtering all tags is an engine GameplayTagsToolset action (via call_tool). To walk a specific subtree from Python, use get_children:

import unreal

# Direct children under "Cube"
for t in unreal.GameplayTagService.get_children("Cube"):
    print(f"{t.tag_name} (source={t.source}, children={t.child_count})")

Check Tag Existence Before Use

import unreal

tag_name = "Cube.StartChasing"
if unreal.GameplayTagService.has_tag(tag_name):
    print(f"Tag '{tag_name}' exists")
else:
    # Register it (bulk-capable VibeUE helper; or use the engine GameplayTagsToolset)
    unreal.GameplayTagService.add_tags([tag_name])

Inspect Tag Hierarchy

import unreal

# Get children of root "Cube" tag
children = unreal.GameplayTagService.get_children("Cube")
for child in children:
    print(f"  {child.tag_name} (explicit={child.is_explicit})")

Rename a Tag

Renaming is an engine GameplayTagsToolset action — call it via call_tool. Then verify the redirect from Python (the old name still resolves through the redirect, so has_tag stays True):

import unreal

# (rename Cube.StartChasing -> Cube.BeginChase via the engine GameplayTagsToolset, then:)
info = unreal.GameplayTagService.get_tag_info("Cube.StartChasing")
print(f"Old name now redirects to: {info.redirected_to}")  # 'Cube.BeginChase'

Remove a Tag

Removing a single tag is an engine GameplayTagsToolset action (via call_tool). Confirm it is gone from Python with has_tag / get_children on the parent.

---

API Reference

VibeUE delta (call as unreal.GameplayTagService.<method> via execute_python_code):

Method	Returns	Description
has_tag(tag_name)	bool	Check if tag exists (also True for redirected old names of renamed tags)
get_tag_info(tag_name)	FGameplayTagInfo or None	Get detailed tag info (struct or None — NOT a tuple)
get_children(parent_tag)	[FGameplayTagInfo]	Get direct children of a tag
add_tags(tag_names, comment, source)	FGameplayTagResult	Bulk-register multiple tags (also works for one)

Single-tag add / remove / rename and list-all are provided by Unreal 5.8's native GameplayTagsToolset — reach it with call_tool; run describe_toolset for its actions.

FGameplayTagInfo Fields

Field	Type	Description
tag_name	str	Full tag name (as requested)
redirected_to	str	If the requested name was renamed, the new canonical tag it redirects to (empty if none). Other fields describe the redirect target.
comment	str	Developer comment
source	str	Where tag was defined
is_explicit	bool	Explicitly defined vs implied parent
child_count	int	Number of direct children

Sample scripts (run via execute_python_code)

• scripts/add_tags.txt — register gameplay tags and list them.