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.
Claude Code Hero Level 0: The Threshold -- learn the basics of talking to Claude Code before entering the dungeon
Install Level 0 The Threshold
$ npx skills add kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kylesnowschwartz/claude-code-hero level-0-the-threshold --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/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/level-0-the-threshold .claude/skills/level-0-the-threshold && 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 "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .claude/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-thresholdType 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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kylesnowschwartz/claude-code-hero level-0-the-threshold --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/level-0-the-threshold .agents/skills/level-0-the-threshold && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .agents/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kylesnowschwartz/claude-code-hero level-0-the-threshold --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/level-0-the-threshold .cursor/skills/level-0-the-threshold && 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 "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .cursor/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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/kylesnowschwartz/claude-code-hero.git --path skills/level-0-the-threshold--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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kylesnowschwartz/claude-code-hero level-0-the-threshold --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/level-0-the-threshold .gemini/skills/level-0-the-threshold && 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 "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .gemini/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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 kylesnowschwartz/claude-code-hero level-0-the-thresholdInstalls 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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/level-0-the-threshold .github/skills/level-0-the-threshold && 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 "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .github/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kylesnowschwartz/claude-code-hero level-0-the-threshold --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kylesnowschwartz/claude-code-hero.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/level-0-the-threshold .opencode/skills/level-0-the-threshold && 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 "level-0-the-threshold" agent skill from https://github.com/kylesnowschwartz/claude-code-hero/tree/main/skills/level-0-the-threshold into .opencode/skills/level-0-the-threshold/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "level-0-the-threshold", 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
level-0-the-threshold- GitHub stars
- 104
- Token cost
- ~828 tokens
- SKILL.md length
- 509 words
- Files
- 1
- Skills in repo
- 15
- Repo updated
- First seen
- Licence
- None found
At a glance
Claude Code Hero Level 0: The Threshold -- learn the basics of talking to Claude Code before entering the dungeon
- Agent Workflows work in your project
- SKILL.md covers Objective, Why This Matters, The Quest and Hints, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Level 0 The Threshold is an agent skill from kylesnowschwartz/claude-code-hero. Claude Code Hero Level 0: The Threshold -- learn the basics of talking to Claude Code before entering the dungeon
Its SKILL.md is about 830 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 Agent Workflows.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/level-0-the-threshold”
What it can do on your machine
Read from SKILL.md and the folder at commit 4abcc6d. 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
Links to these hosts (documentation or services it may open):
docs.anthropic.com
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
Level 0 The Threshold loads about 828 tokens when it runs. Until then it costs about 34 tokens; SKILL.md has 509 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 509 words (~828 tokens).
“Learn the three things every Claude Code user needs: how to give an instruction, how to point Claude at a file, and how to ask Claude to create something. Then prove it by having Claude write your first artifact.”
- name
- level-0-the-threshold
Files
Just SKILL.md in skills/level-0-the-threshold of kylesnowschwartz/claude-code-hero.
Open the folder on GitHubat commit 4abcc6d
Compare with similar skills
Level 0 The Threshold 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 |
|---|---|---|---|---|---|---|
| Level 0 The Threshold this skillkylesnowschwartz/claude-code-hero | 104 | — | ~828 | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
Similar skills
- Official
- Official
Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
Using Superpowers
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
Executing Plans Inline
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
- Official
Skill Creator
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
- Official
Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
More from kylesnowschwartz/claude-code-hero
All 15 skills in this repoLevel 1 The Map Room
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 1: The Map Room -- explore the project's .claude/ directory and document what lives there
Level 10 The Hall Of Watchers
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 10: The Hall of Watchers -- add a PreToolUse prompt hook with a multi-tool matcher
Level 11 The Oracle Well
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 11: The Oracle Well -- connect an MCP server and gain a new tool
Level 12 The Warband
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 12: The Warband -- write a dynamic workflow that fans work out across agents
Level 2 The Tome
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 2: The Tome of First Instructions -- create .claude/CLAUDE.md with real personal instructions
Level 3 The Goblin Lair
kylesnowschwartz/claude-code-hero
Claude Code Hero Level 3: The Goblin Lair of Commands -- create a custom slash command in .claude/commands/
Related
Categories
Questions about Level 0 The Threshold
What does Level 0 The Threshold do?
Claude Code Hero Level 0: The Threshold -- learn the basics of talking to Claude Code before entering the dungeon. Level 0 The Threshold is an agent skill from kylesnowschwartz/claude-code-hero.
When should I use Level 0 The Threshold?
Level 0 The Threshold fits situations like: agent Workflows work in your project.
How do I install Level 0 The Threshold in Claude Code?
Run `npx skills add kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a claude-code`. Or copy the skill folder (skills/level-0-the-threshold in kylesnowschwartz/claude-code-hero) into .claude/skills/level-0-the-threshold in your project. Claude Code loads it when a task matches its description.
How do I install Level 0 The Threshold in Codex?
Run `npx skills add kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a codex`. Or copy the skill folder (skills/level-0-the-threshold in kylesnowschwartz/claude-code-hero) into .agents/skills/level-0-the-threshold in your project. Codex loads it when a task matches its description.
Can I use Level 0 The Threshold 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 kylesnowschwartz/claude-code-hero --skill level-0-the-threshold -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/level-0-the-threshold, .gemini/skills/level-0-the-threshold, .github/skills/level-0-the-threshold and .opencode/skills/level-0-the-threshold in your project.
What does Level 0 The Threshold need to run?
SKILL.md names no scripts, command-line tools or credentials: Level 0 The Threshold is instructions for the agent only.
Does Level 0 The Threshold access the network?
SKILL.md names 1 domain. As links in the text: docs.anthropic.com. This is read from the text; nothing was executed.
Is Level 0 The Threshold 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 Level 0 The Threshold use?
No licence was found for Level 0 The Threshold or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Level 0 The Threshold use?
About 828 tokens (SKILL.md is roughly 3.3k 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 Level 0 The Threshold?
Skills that share tags, products or a category with Level 0 The Threshold: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Level 0 The Threshold?
kylesnowschwartz (a GitHub user) maintains it in kylesnowschwartz/claude-code-hero, which has 104 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on September 7, 2026.
Source: kylesnowschwartz/claude-code-hero on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.