Agent skill

Gum Forms

by vchelaru in vchelaru/FlatRedBall

FRB Gum Forms codegen and how Forms controls take cursor input.

MITAuto-check passedGame Development

Install Gum Forms

skills CLI
$ npx skills add vchelaru/FlatRedBall --skill gum-forms -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install vchelaru/FlatRedBall gum-forms --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/gum-forms .claude/skills/gum-forms && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
gum-forms
GitHub stars
578
Token cost
~367 tokens
SKILL.md length
143 words
Files
1
Skills in repo
32
Repo updated
First seen
Licence
MIT

At a glance

FRB Gum Forms codegen and how Forms controls take cursor input.

  • Tasks that involve Project scaffolding
  • SKILL.md covers Where it lives and Landmines
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Gum Forms is an agent skill from vchelaru/FlatRedBall. FRB Gum Forms codegen and how Forms controls take cursor input. Triggers: XxxForms.Generated.cs, FormsClassCodeGenerator, UserControl, Cursor.WindowOver, clicks eaten by Gum UI.

Its SKILL.md is about 370 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Game Development, covering Project scaffolding. The repository describes itself as: Cross-platform 2D game engine focused on ultimate productivity built in .NET. The licence is MIT.

When your agent uses it

  • Tasks that involve Project scaffolding

Example prompts

  • “/gum-forms”

What it can do on your machine

Read from SKILL.md and the folder at commit fa654ab. 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

    No scripts in the folder and no shell commands in SKILL.md.

    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

Gum Forms loads about 367 tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 143 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~47
When it runs · the whole SKILL.md, loaded when a task matches
~367

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from vchelaru/FlatRedBall at commit fa654ab, republished under its MIT licence (© vchelaru). 143 words, ~367 tokens.

Download SKILL.mdSave it as .claude/skills/gum-forms/SKILL.md (or your agent's skills folder).
name
gum-forms
description
FRB Gum Forms codegen and how Forms controls take cursor input. Triggers: XxxForms.Generated.cs, FormsClassCodeGenerator, UserControl, Cursor.WindowOver, clicks eaten by Gum UI.

Gum Forms (FRB1)

FRB's Gum codegen makes two classes for each Gum element: a Visual runtime (GumRuntimes\XxxRuntime.Generated.cs) and a Forms class (Forms\...\XxxForms.Generated.cs). A Gum screen paired with an FRB screen gets both. MonoGameGum and FRB2 merged the two, so don't carry this split over from them. See [[gum-integration]] for the rest of the Gum plugin.

Where it lives

PieceLocation
Forms class per elementFRBDK\Glue\GumPlugin\GumPlugin\CodeGeneration\FormsClassCodeGenerator.cs
Forms instance on an FRB screenFormsObjectCodeGenerator.cs (same folder)
Forms controls (Button, UserControl...)Engines\Forms\FlatRedBall.Forms\FlatRedBall.Forms.Shared\Controls\

Landmines

  • Every Gum component is a Forms control. FormsClassCodeGenerator makes each component's Forms class inherit FlatRedBall.Forms.Controls.UserControl, including plain layout panels. So "is this a Forms control?" says nothing about whether it's interactive.
  • Gum UI under the cursor blocks world selection in live edit only when the Game tab's "Gum Interaction" checkbox is on (GumCursorLogic.ShouldGumBlockWorldSelection). Gum controls still receive the click either way. See [[glue-live-edit]].

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

Files

Just SKILL.md in .claude/skills/gum-forms of vchelaru/FlatRedBall.

Open the folder on GitHubat commit fa654ab

Compare with similar skills

Gum Forms next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Gum Forms compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Gum Forms this skillvchelaru/FlatRedBall578—~367Automated safety check: PassMIT
Hz New Project Creationmeta-quest/agentic-tools215—~2.3kAutomated safety check: PassApache-2.0
Godot Project Templatesthedivergentai/GD-Agentic-Skills816—~3.3kAutomated safety check: PassLGPL-3.0
Godot Project Setupjame581/GodotPrompter799—~3.2kAutomated safety check: PassMIT
Gm ScaffoldRandallLiuXin/GodotMaker550—~1.9kAutomated safety check: PassCustom licence
Threejs Towersnirholas/three.ws2281 repos~2kAutomated safety check: PassApache-2.0

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Questions about Gum Forms

What does Gum Forms do?

FRB Gum Forms codegen and how Forms controls take cursor input. Gum Forms is an agent skill from vchelaru/FlatRedBall. FRB Gum Forms codegen and how Forms controls take cursor input.

When should I use Gum Forms?

Gum Forms fits situations like: tasks that involve Project scaffolding.

How do I install Gum Forms in Claude Code?

Run `npx skills add vchelaru/FlatRedBall --skill gum-forms -a claude-code`. Or copy the skill folder (.claude/skills/gum-forms in vchelaru/FlatRedBall) into .claude/skills/gum-forms in your project. Claude Code loads it when a task matches its description.

How do I install Gum Forms in Codex?

Run `npx skills add vchelaru/FlatRedBall --skill gum-forms -a codex`. Or copy the skill folder (.claude/skills/gum-forms in vchelaru/FlatRedBall) into .agents/skills/gum-forms in your project. Codex loads it when a task matches its description.

Can I use Gum Forms in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add vchelaru/FlatRedBall --skill gum-forms -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/gum-forms, .gemini/skills/gum-forms, .github/skills/gum-forms and .opencode/skills/gum-forms in your project.

What does Gum Forms need to run?

SKILL.md names no scripts, command-line tools or credentials: Gum Forms is instructions for the agent only.

Does Gum Forms access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Gum Forms safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Gum Forms use?

Gum Forms is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Gum Forms use?

About 367 tokens (SKILL.md is roughly 1.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Gum Forms?

Skills that share tags, products or a category with Gum Forms: Hz New Project Creation (meta-quest/agentic-tools, 215 stars), Godot Project Templates (thedivergentai/GD-Agentic-Skills, 816 stars), Godot Project Setup (jame581/GodotPrompter, 799 stars) and Gm Scaffold (RandallLiuXin/GodotMaker, 550 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Gum Forms?

vchelaru (a GitHub user) maintains it in vchelaru/FlatRedBall, which has 578 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on October 8, 2026.

Source: vchelaru/FlatRedBall on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.