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.
规划或实现面向外部 agent / Claw 的稳定控制 API，优先做底层分层、query/command 收口、runtime 串行化与契约文档，而不是零散补接口
Install External Control API
$ npx skills add 4thfever/cultivation-world-simulator --skill external-control-api -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install 4thfever/cultivation-world-simulator external-control-api --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/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.cursor/skills/external-control-api .claude/skills/external-control-api && 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 "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .claude/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-apiType 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 4thfever/cultivation-world-simulator --skill external-control-api -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install 4thfever/cultivation-world-simulator external-control-api --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.cursor/skills/external-control-api .agents/skills/external-control-api && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .agents/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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 4thfever/cultivation-world-simulator --skill external-control-api -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install 4thfever/cultivation-world-simulator external-control-api --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.cursor/skills/external-control-api .cursor/skills/external-control-api && 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 "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .cursor/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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/4thfever/cultivation-world-simulator.git --path .cursor/skills/external-control-api--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 4thfever/cultivation-world-simulator --skill external-control-api -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install 4thfever/cultivation-world-simulator external-control-api --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.cursor/skills/external-control-api .gemini/skills/external-control-api && 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 "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .gemini/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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 4thfever/cultivation-world-simulator external-control-apiInstalls 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 4thfever/cultivation-world-simulator --skill external-control-api -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .github/skills && cp -r skills-src/.cursor/skills/external-control-api .github/skills/external-control-api && 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 "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .github/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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 4thfever/cultivation-world-simulator --skill external-control-api -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install 4thfever/cultivation-world-simulator external-control-api --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/4thfever/cultivation-world-simulator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.cursor/skills/external-control-api .opencode/skills/external-control-api && 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 "external-control-api" agent skill from https://github.com/4thfever/cultivation-world-simulator/tree/main/.cursor/skills/external-control-api into .opencode/skills/external-control-api/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "external-control-api", 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
external-control-api- GitHub stars
- 2.1k
- Token cost
- ~827 tokens
- SKILL.md length
- 275 words
- Files
- 1
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
规划或实现面向外部 agent / Claw 的稳定控制 API，优先做底层分层、query/command 收口、runtime 串行化与契约文档，而不是零散补接口
- Works in 4 steps: 先梳理现状 → 再定边界 → 先做底盘，再做接口 → …
- Agent Workflows work in your project
- SKILL.md covers 适用场景, 目标, 首先检查什么 and 推荐工作流, plus 5 more sections
- Calls npm and pytest
What it does
External Control API is an agent skill from 4thfever/cultivation-world-simulator. 规划或实现面向外部 agent / Claw 的稳定控制 API，优先做底层分层、query/command 收口、runtime 串行化与契约文档，而不是零散补接口
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. The repository describes itself as: 基于 AI Agent 工作流的修仙世界模拟器，旨在还原智能、开放的仙侠世界。| An open-source Cultivation World Simulator using Agentic Workflow to create a dynamic, emerging Xianxia world.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/external-control-api”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- 先梳理现状
- 再定边界
- 先做底盘，再做接口
- 保持“有语义的命令”设计
What it can do on your machine
Read from SKILL.md and the folder at commit 471fe74. 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:
npmpytest
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
External Control API loads about 827 tokens when it runs. Until then it costs about 26 tokens; SKILL.md has 275 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 275 words (~827 tokens).
- name
- external-control-api
Files
Just SKILL.md in .cursor/skills/external-control-api of 4thfever/cultivation-world-simulator.
Open the folder on GitHubat commit 471fe74
Compare with similar skills
External Control API 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 |
|---|---|---|---|---|---|---|
| External Control API this skill4thfever/cultivation-world-simulator | 2.1k | — | ~827 | Automated safety check: Pass | Custom licence | |
| MCP Server Builderanthropics/skills | 180k | 64 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 11 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 | 296k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 |
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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
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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
Claude Code Agent Development
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Skill Creator
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Create new skills, modify and improve existing skills, and measure skill performance.
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Related
Categories
Questions about External Control API
What does External Control API do?
规划或实现面向外部 agent / Claw 的稳定控制 API，优先做底层分层、query/command 收口、runtime 串行化与契约文档，而不是零散补接口. External Control API is an agent skill from 4thfever/cultivation-world-simulator.
When should I use External Control API?
External Control API fits situations like: agent Workflows work in your project.
How do I install External Control API in Claude Code?
Run `npx skills add 4thfever/cultivation-world-simulator --skill external-control-api -a claude-code`. Or copy the skill folder (.cursor/skills/external-control-api in 4thfever/cultivation-world-simulator) into .claude/skills/external-control-api in your project. Claude Code loads it when a task matches its description.
How do I install External Control API in Codex?
Run `npx skills add 4thfever/cultivation-world-simulator --skill external-control-api -a codex`. Or copy the skill folder (.cursor/skills/external-control-api in 4thfever/cultivation-world-simulator) into .agents/skills/external-control-api in your project. Codex loads it when a task matches its description.
Can I use External Control API 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 4thfever/cultivation-world-simulator --skill external-control-api -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/external-control-api, .gemini/skills/external-control-api, .github/skills/external-control-api and .opencode/skills/external-control-api in your project.
What does External Control API need to run?
Going by SKILL.md and its folder, External Control API needs the command-line tools its instructions call (npm and pytest).
Does External Control API 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 External Control API 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 External Control API use?
External Control API 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 External Control API use?
About 827 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 External Control API?
Skills that share tags, products or a category with External Control API: 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, 296k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains External Control API?
4thfever (a GitHub user) maintains it in 4thfever/cultivation-world-simulator, which has 2,105 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on August 16, 2026.
Source: 4thfever/cultivation-world-simulator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.