UE5 Python Script Development Guide Agent Skill

Comprehensive guide for developing UE5 Editor Python scripts with proper workflow and best practices.

Context cost
12.6k tokensestimated from the bundle, loaded when it triggers
Bundle
32 files · 284.6 kB23 scripts among them — read before you run
Licence
not declarednone named by its author
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Comprehensive guide for developing UE5 Editor Python scripts with proper workflow and best practices. Use when the user wants to (1) write a UE5 Python script, (2) mentions writing a script in a UE5 project context, or (3) has a requirement that Claude identifies can be fulfilled by a UE5 Python script (e.g., batch processing game assets, automating editor tasks).

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

gamedevpython

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md8.5 kB · preview
--- name: ue5-python allowedTools: - tool: Read path: "${CLAUDE_PROJECT_DIR}/**" - tool: Write path: "${CLAUDE_PROJECT_DIR}/**" - tool: Edit path: "${CLAUDE_PROJECT_DIR}/**" - tool: Glob path: "${CLAUDE_PROJECT_DIR}/**" - tool: Grep path: "${CLAUDE_PROJECT_DIR}/**" allowedPrompts: - tool: Bash prompt: "run python scripts in project directory" - tool: Bash prompt: "execute UE5 remote python scripts" - tool: Bash prompt: "take game screenshots" - tool: Bash prompt: "delete temporary files in project" hooks: PreToolUse: - matcher: "Write|Edit" hooks: - type: command command: | python -c " import sys, json, re try: data = json.load(sys.stdin) tool = data.get('tool_name', '') if tool not in ['Write', 'Edit']: sys.exit(0) fp = data.get('tool_input', {}).get('file_path', '') if not fp.endswith('.py'): sys.exit(0) content = data.get('tool_input', {}).get('content', '') if tool == 'Write' else '' if not content or 'import unreal' not in content: sys.exit(0) ops = [r'\.set_editor_property\(', r'.*save.*\(', r'\.set_editor_properties\(', r'\.modify\('] has_ops = any(re.search(p, content) for p in ops) if not has_ops: sys.exit(0) has_tx = bool(re.search(r'with\s+unreal\.ScopedEditorTransaction\s*\(', content) or re.search(r'unreal\.ScopedEditorTransaction\(', content)) if not has_tx: print(f'Transaction Check Failed: {fp}\n\nThis UE5 Python script modifies assets but does NOT use transactions.\n\nREQUIRED: Wrap in transaction:\n with unreal.ScopedEditorTransaction(\"Desc\"):\n asset.set_editor_property(...)\n\nWhy: Enables undo and rollback on failure.', file=sys.stderr) sys.exit(2) except: pass " Stop: - matcher: "*" hooks: - type: prompt prompt: | Examining $ARGUMENTS, verify if all of the user's requirements have been fully completed: 1. **Review all user requests** - Look at the initial request and any follow-up requirements 2. **Check task completion**: - All requested scripts written and saved? - All scripts tested and verified working? - Visual verification done if needed (screenshots taken)? - All API validations passed? - All errors fixed and resolved? - All user questions answered? 3. **Final cleanup** - Delete all failed screenshot attempts - only keep successful verification screenshots Respond with JSON: {"ok": true} to allow stopping, or {"ok": false, "reason": "your explanation"} to continue working. **Decision rules:** - Return {"ok": true} ONLY if all requirements are fully complete - Return {"ok": false, "reason": "your explanation"} if any required task is incomplete, unverified, or outstanding - If uncertain, return {"ok": false, "reason": "your explanation"} to ensure nothing is skipped ---
73# UE5 Python Script Development Guide
74
75A workflow-oriented guide for developing reliable UE5 Editor Python scripts.
76
77## Prerequisites
78
79[Critical] **ue5-visual** subagent and **ue-mcp** server must be available. If not present, refuse to use this skill.
80
81CLI scripts for capture and diagnostics are in scripts/. See [Capture Scripts Reference](./references/capture-scripts.md) for details.
82
83## Development Workflow
84
85### Phase 1: Requirements
86
87Clarify requirements with user using AskUserQuestions tool until you have 95% confidence in understanding their intentions.
88
89### Phase 2: Planning
90
91**Do not implement yet - just plan.**
92
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md971 words
Files32
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈910
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
11,640
on trigger
The instruction body and 31 supporting files, read only when the skill fires.
6.3%
of a 200k window
Ten skills this size would take about 63% of the window before you open a file.
050k100k150k200k context window

12.6k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

32 files, 284.6 kB on disk. Mostly text — the instructions the model reads — with 23 scripts in it that your client would run only if the instructions tell it to. 6 files of its source are not in the download — listed after these, with why.

  • SKILL.md8.5 kB
  • examples/add_gameplaytag_to_asset.py6.4 kB
  • examples/create_dark_pyramid_level.py11.6 kB
  • examples/create_footwork_blendspace.py4.7 kB
  • examples/create_punching_bag_blueprint.py11.8 kB
  • examples/create_sky_level.py6.3 kB
  • examples/pie_screenshot_capturer.py15.7 kB
  • references/asset-diagnostic.md8.1 kB
  • references/best-practices.md4.4 kB
  • references/capture-scripts.md10.4 kB
  • references/cpp-source-investigation.md4.5 kB
  • references/editor-capture.md9.3 kB
  • references/extra-python-apis.md1.5 kB
  • scripts/asset-diagnostic.py3.7 kB
  • scripts/install_extra_python_apis_plugin.py4.7 kB
  • scripts/orbital-capture.py8.2 kB
  • scripts/pie-capture.py8.1 kB
  • scripts/window-capture.py8.9 kB
  • references/common-pitfals/cable-component.md3.3 kB
  • references/common-pitfals/rotator.md0.2 kB
  • site-packages/asset_diagnostic/__init__.py1.7 kB
  • site-packages/asset_diagnostic/__main__.py5.2 kB
  • site-packages/asset_diagnostic/core.py11.5 kB
  • site-packages/asset_diagnostic/utils.py14.2 kB
  • site-packages/editor_capture/__init__.py3.7 kB
  • site-packages/editor_capture/asset_editor.py6.1 kB
  • site-packages/editor_capture/orbital.py24.5 kB
  • site-packages/editor_capture/pie_capture.py18.7 kB
  • site-packages/editor_capture/window_capture.py15.9 kB
  • site-packages/asset_diagnostic/diagnostics/__init__.py2.2 kB
  • site-packages/asset_diagnostic/diagnostics/base.py4.3 kB
  • site-packages/asset_diagnostic/diagnostics/level.py36.3 kB

Not in the download

Not carried is a type a skill download does not hold. Take them from its source.

  • plugin/ExtraPythonAPIs/ExtraPythonAPIs.upluginnot carried
  • plugin/ExtraPythonAPIs/Source/ExtraPythonAPIs/ExtraPythonAPIs.Build.csnot carried
  • plugin/ExtraPythonAPIs/Source/ExtraPythonAPIs/Private/ExBlueprintComponentLibrary.cppnot carried
  • plugin/ExtraPythonAPIs/Source/ExtraPythonAPIs/Private/ExtraPythonAPIsModule.cppnot carried
  • plugin/ExtraPythonAPIs/Source/ExtraPythonAPIs/Public/ExBlueprintComponentLibrary.hnot carried
  • plugin/ExtraPythonAPIs/Source/ExtraPythonAPIs/Public/ExtraPythonAPIsModule.hnot carried
What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 23 scripts beside the text, so the download is 32 files — not the whole of its source: 6 files are left out. They are listed under the files, with why.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# UE5 Python Script Development Guide · 12.6k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/ue5-python-script-development-guide/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/ue5-python-script-development-guide" ] && { [ ! -e .claude/skills/ue5-python-script-development-guide ] || { mv .claude/skills/ue5-python-script-development-guide "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/ue5-python-script-development-guide" .claude/skills/ && echo "Installed .claude/skills/ue5-python-script-development-guide"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add chengdagong/ue5-python-script-development-guide

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/ue5-python-script-development-guide/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/ue5-python-script-development-guide/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/ue5-python-script-development-guide" ] && { [ ! -e ~/.claude/skills/ue5-python-script-development-guide ] || { mv ~/.claude/skills/ue5-python-script-development-guide "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/ue5-python-script-development-guide" ~/.claude/skills/ && echo "Installed ~/.claude/skills/ue5-python-script-development-guide" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/ue5-python-script-development-guide/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as ue5-python in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, ue5-python-script-development-guide. Not in this download: 6 files of its source (the full list, and why). Take them from its source.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencechengdagong/ue5-python-script-development-guide

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

—no reviews yet

Nobody has reviewed this skill yet. The rating is the mean of the reviews written here, so there is none until somebody writes the first.

Sign in to review it

A review is tied to an account so it can be answered, edited and taken down by the person who wrote it.

Sign in
Who can post

Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

Publisher
Servers0
Claim this skill