Agent skill

Gm Craft

by Sstobo in Sstobo/Claude-Code-Game-Master

The Art of Game Mastering — narration, NPC, pacing, and improvisation wisdom that makes a session feel magical.

Custom licenceAuto-check: warningsMedia & Creative

Install Gm Craft

The automated check flagged lines worth reading first. See the safety section below.

skills CLI
$ npx skills add Sstobo/Claude-Code-Game-Master --skill gm-craft -a claude-code

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

GitHub CLI
$ gh skill install Sstobo/Claude-Code-Game-Master gm-craft --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/Sstobo/Claude-Code-Game-Master.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/gm-craft .claude/skills/gm-craft && 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
gm-craft
GitHub stars
155
Token cost
~2k tokens
SKILL.md length
1,156 words
Files
1
Skills in repo
8
Repo updated
First seen
Licence
Custom licence

At a glance

The Art of Game Mastering — narration, NPC, pacing, and improvisation wisdom that makes a session feel magical.

  • Tasks that involve Text to speech and voice
  • SKILL.md covers Narration, Reward the spectacle (XP is…, Narrative Voice (write in the… and Diegetic Illustration (the…, plus 4 more sections
  • Calls bash

What it does

Gm Craft is an agent skill from Sstobo/Claude-Code-Game-Master. The Art of Game Mastering — narration, NPC, pacing, and improvisation wisdom that makes a session feel magical. Load when narrating a scene, voicing an NPC, or pacing a beat. This is the product's soul; internalize it, then play.

Its SKILL.md is about 2k 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 Media & Creative, covering Text to speech and voice. The repository describes itself as: Total conversion for Claude Code. Use RAG and the RPG ruleset apis to play a persistent adventure in any book or world of your choosing.

When your agent uses it

  • Tasks that involve Text to speech and voice

Example prompts

  • “/gm-craft”

What it can do on your machine

Read from SKILL.md and the folder at commit dea9931. 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

    Shell commands in SKILL.md call:

    • bash

    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

Gm Craft loads about 2k tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 1,156 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~2k

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: warnings

The automated check found patterns that need a careful read before installing.

  • WarningTells the agent its actions are pre-authorized / not to stop for confirmationSKILL.md:44
    them often and with glee (~$0.04 each). Don't ask permission, don't apologize for the cost, don't hoard them for "import

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,156 words (~1,959 tokens).

“Wisdom, not rules. Internalize, then forget — the best moments happen when you stop thinking about technique and just play.”

— opening of SKILL.md by Sstobo, Custom licence
name
gm-craft

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/gm-craft of Sstobo/Claude-Code-Game-Master.

Open the folder on GitHubat commit dea9931

Compare with similar skills

Gm Craft 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.

Gm Craft compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Gm Craft this skillSstobo/Claude-Code-Game-Master155—~2kAutomated safety check: WarnCustom licence
MoneyPrinterTurbo Video Generatorharry0703/MoneyPrinterTurbo129k—~2.1kAutomated safety check: WarnMIT
HyperFrames Media Useheygen-com/hyperframes60k—~2.4kAutomated safety check: PassApache-2.0
Openspec OnboardSAP/e-mobility-charging-stations-simulator22725 repos~3.5kAutomated safety check: PassMIT
Blog AudioAgriciDaniel/claude-blog2.3k1 repos~2.2kAutomated safety check: NotesMIT
Musictadaspetra/loop2962 repos~827Automated safety check: PassMIT

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Questions about Gm Craft

What does Gm Craft do?

The Art of Game Mastering — narration, NPC, pacing, and improvisation wisdom that makes a session feel magical. Gm Craft is an agent skill from Sstobo/Claude-Code-Game-Master. The Art of Game Mastering — narration, NPC, pacing, and improvisation wisdom that makes a session feel magical.

When should I use Gm Craft?

Gm Craft fits situations like: tasks that involve Text to speech and voice.

How do I install Gm Craft in Claude Code?

Run `npx skills add Sstobo/Claude-Code-Game-Master --skill gm-craft -a claude-code`. Or copy the skill folder (.claude/skills/gm-craft in Sstobo/Claude-Code-Game-Master) into .claude/skills/gm-craft in your project. Claude Code loads it when a task matches its description.

How do I install Gm Craft in Codex?

Run `npx skills add Sstobo/Claude-Code-Game-Master --skill gm-craft -a codex`. Or copy the skill folder (.claude/skills/gm-craft in Sstobo/Claude-Code-Game-Master) into .agents/skills/gm-craft in your project. Codex loads it when a task matches its description.

Can I use Gm Craft 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 Sstobo/Claude-Code-Game-Master --skill gm-craft -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/gm-craft, .gemini/skills/gm-craft, .github/skills/gm-craft and .opencode/skills/gm-craft in your project.

What does Gm Craft need to run?

Going by SKILL.md and its folder, Gm Craft needs the command-line tools its instructions call (bash).

Does Gm Craft 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 Gm Craft safe to install?

Our automated static check of SKILL.md flagged 1 warning(s): tells the agent its actions are pre-authorized / not to stop for confirmation. Read the flagged lines before installing; the check is not a guarantee either way.

What licence does Gm Craft use?

Gm Craft has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Gm Craft use?

About 2k tokens (SKILL.md is roughly 7.8k 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 Gm Craft?

Skills that share tags, products or a category with Gm Craft: MoneyPrinterTurbo Video Generator (harry0703/MoneyPrinterTurbo, 129k stars), HyperFrames Media Use (heygen-com/hyperframes, 60k stars), Openspec Onboard (SAP/e-mobility-charging-stations-simulator, 227 stars) and Blog Audio (AgriciDaniel/claude-blog, 2.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Gm Craft?

Sstobo (a GitHub user) maintains it in Sstobo/Claude-Code-Game-Master, which has 155 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on August 16, 2026.

Source: Sstobo/Claude-Code-Game-Master on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.