MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Automate the OpenMMO game login process — open the dev server in real Chrome, sign in with Google, and enter the game with the default-selected character.
Custom licenceAuto-check passed
Install Game Login
$ npx skills add Julian-adv/OpenMMO --skill game-login -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Julian-adv/OpenMMO game-login --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/game-login .claude/skills/game-login && rm -rf skills-srcUse ~/.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/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .claude/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-loginType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Julian-adv/OpenMMO --skill game-login -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Julian-adv/OpenMMO game-login --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/game-login .agents/skills/game-login && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .agents/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Julian-adv/OpenMMO --skill game-login -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Julian-adv/OpenMMO game-login --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/game-login .cursor/skills/game-login && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .cursor/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Julian-adv/OpenMMO.git --path .claude/skills/game-login--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Julian-adv/OpenMMO --skill game-login -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Julian-adv/OpenMMO game-login --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/game-login .gemini/skills/game-login && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .gemini/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Julian-adv/OpenMMO game-loginInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Julian-adv/OpenMMO --skill game-login -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/game-login .github/skills/game-login && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .github/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Julian-adv/OpenMMO --skill game-login -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Julian-adv/OpenMMO game-login --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Julian-adv/OpenMMO.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/game-login .opencode/skills/game-login && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "game-login" agent skill from https://github.com/Julian-adv/OpenMMO/tree/master/.claude/skills/game-login into .opencode/skills/game-login/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-login", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
game-login- GitHub stars
- 1.8k
- Token cost
- ~798 tokens
- SKILL.md length
- 388 words
- Files
- 1
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Automate the OpenMMO game login process — open the dev server in real Chrome, sign in with Google, and enter the game with the default-selected character.
- Works in 7 steps: Open the game in Chrome —… → Wait for sign-in — auto_select: true… → Click the Google button if still on the… → …
- The user says game login
- SKILL.md covers Browser surface: real Chrome…, Steps and Notes
- Calls npm
What it does
Game Login is an agent skill from Julian-adv/OpenMMO. Automate the OpenMMO game login process — open the dev server in real Chrome, sign in with Google, and enter the game with the default-selected character. Use this skill whenever the user says "game login", "log into the game", "start the game", "connect to OpenMMO", or "connect to BottleField".
Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Model Context Protocol.
When your agent uses it
- The user says game login
- Log into the game
- Connect to OpenMMO
- Connect to BottleField
Example prompts
- “game login”
- “log into the game”
- “start the game”
- “/game-login”
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Open the game in Chrome — tabs_context_mcp (createIfEmpty: true), then navigate to https://localhost:10004/.
- Wait for sign-in — auto_select: true means returning users are signed in automatically with no click. Screenshot and check whether the…
- Click the Google button if still on the login screen — the pill button reads "Sign in as " / "(으)로 로그인". Clicking it uses the existing…
- Wait for character select — ~3 seconds. The first character is selected automatically, so no manual selection is needed.
- Click Start — enters the game with the default-selected character.
- Confirm game loaded — wait ~5 seconds for the world to load.
- Take screenshot — confirm entry.
What it can do on your machine
Read from SKILL.md and the folder at commit d580689. 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:
npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.
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
Game Login loads about 798 tokens when it runs. Until then it costs about 77 tokens; SKILL.md has 388 words of instructions outside code blocks.
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 388 words (~798 tokens).
“Automates the login flow for the OpenMMO online RPG against the dev server using browser automation.”
- name
- game-login
Files
Just SKILL.md in .claude/skills/game-login of Julian-adv/OpenMMO.
Open the folder on GitHubat commit d580689
Compare with similar skills
Game Login 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Game Login this skillJulian-adv/OpenMMO | 1.8k | — | ~798 | Automated safety check: Pass | Custom licence | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 4 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Figma use_figma Plugin API Ruleswarpdotdev/warp | 65k | 4 repos | ~4.4k | Automated safety check: Pass | AGPL-3.0 | |
| Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills | 8.5k | 6 repos | ~3.2k | Automated safety check: Notes | Apache-2.0 |
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Works with
Questions about Game Login
What does Game Login do?
Automate the OpenMMO game login process — open the dev server in real Chrome, sign in with Google, and enter the game with the default-selected character. Game Login is an agent skill from Julian-adv/OpenMMO. Automate the OpenMMO game login process — open the dev server in real Chrome, sign in with Google, and enter the game with the default-selected character.
When should I use Game Login?
Game Login fits situations like: the user says game login; log into the game; connect to OpenMMO; connect to BottleField.
How do I install Game Login in Claude Code?
Run `npx skills add Julian-adv/OpenMMO --skill game-login -a claude-code`. Or copy the skill folder (.claude/skills/game-login in Julian-adv/OpenMMO) into .claude/skills/game-login in your project. Claude Code loads it when a task matches its description.
How do I install Game Login in Codex?
Run `npx skills add Julian-adv/OpenMMO --skill game-login -a codex`. Or copy the skill folder (.claude/skills/game-login in Julian-adv/OpenMMO) into .agents/skills/game-login in your project. Codex loads it when a task matches its description.
Can I use Game Login 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 Julian-adv/OpenMMO --skill game-login -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/game-login, .gemini/skills/game-login, .github/skills/game-login and .opencode/skills/game-login in your project.
What does Game Login need to run?
Going by SKILL.md and its folder, Game Login needs the command-line tools its instructions call (npm).
Does Game Login access the network?
SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Game Login 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 Game Login use?
Game Login 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 Game Login use?
About 798 tokens (SKILL.md is roughly 3.2k 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 Game Login?
Skills that share tags, products or a category with Game Login: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Game Login?
Julian-adv (a GitHub user) maintains it in Julian-adv/OpenMMO, which has 1,788 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 10, 2026.
Source: Julian-adv/OpenMMO on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.