Agent skill

Koapp Apps

Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket.

MITAuto-check passedBackend & APIs

Install Koapp Apps

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a claude-code

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

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps --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/AxiosLeo/node-koapp.git skills-src && mkdir -p .claude/skills && cp -r skills-src/assets/skills/koapp-apps .claude/skills/koapp-apps && 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/

Paste into Claude Code

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .claude/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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

$skill-installer install https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps

Type 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.

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AxiosLeo/node-koapp.git skills-src && mkdir -p .agents/skills && cp -r skills-src/assets/skills/koapp-apps .agents/skills/koapp-apps && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .agents/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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.

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AxiosLeo/node-koapp.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/assets/skills/koapp-apps .cursor/skills/koapp-apps && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .cursor/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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

$ gemini skills install https://github.com/AxiosLeo/node-koapp.git --path assets/skills/koapp-apps

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AxiosLeo/node-koapp.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/assets/skills/koapp-apps .gemini/skills/koapp-apps && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .gemini/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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.

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps

Installs 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).

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/AxiosLeo/node-koapp.git skills-src && mkdir -p .github/skills && cp -r skills-src/assets/skills/koapp-apps .github/skills/koapp-apps && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .github/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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.

skills CLI

$ npx skills add AxiosLeo/node-koapp --skill koapp-apps -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install AxiosLeo/node-koapp koapp-apps --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AxiosLeo/node-koapp.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/assets/skills/koapp-apps .opencode/skills/koapp-apps && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "koapp-apps" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-apps into .opencode/skills/koapp-apps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-apps", 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: koapp-apps
GitHub stars: 145
Token cost: ~1.2k tokens
SKILL.md length: 390 words
Files: 5
Skills in repo: 8
Repo updated: Sep 16, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket.

Building a server with koapp
SKILL.md covers Which class do I need?, Shared config keys, Shared events and Shared lifecycle, plus 5 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Configuring ports

What it does

Koapp Apps is an agent skill from AxiosLeo/node-koapp. Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket. Use when building a server with koapp, configuring ports, listen host, session, static files, body parser, ping heartbeat, managing socket connections, or deciding between HTTP/TCP/WS transport.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files (for example `examples.md`, `http-server.md` and `socket-server.md`).

It sits in Backend & APIs, covering Realtime and WebSockets. The repository describes itself as: About Design for quickly developing OpenAPI applications using Node.js. The licence is MIT.

When your agent uses it

Building a server with koapp
Configuring ports
Managing socket connections
Deciding between HTTP/TCP/WS transport

Example prompts

“/koapp-apps”

What it can do on your machine

Read from SKILL.md and the folder at commit 102955d. 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 (its code samples are javascript).
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

Koapp Apps loads about 1.2k tokens when it runs. Until then it costs about 92 tokens; SKILL.md has 390 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~92
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

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 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 AxiosLeo/node-koapp at commit 102955d, republished under its MIT licence (© AxiosLeo). 390 words, ~1,166 tokens.

Download SKILL.mdSave it as .claude/skills/koapp-apps/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.

name: koapp-apps
description: Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket. Use when building a server with koapp, configuring ports, listen host, session, static files, body parser, ping heartbeat, managing socket connections, or deciding between HTTP/TCP/WS transport.

@axiosleo/koapp Application Classes

@axiosleo/koapp exposes three runtime application classes, all extending a shared Application base. Pick one based on the transport you need.

Which class do I need?

Class	Transport	Use when
`KoaApplication`	HTTP(S) via Koa	REST APIs, file uploads, SSR, Server-Sent Events
`SocketApplication`	Raw TCP via Node `net`	Custom TCP protocol, IoT gateways, line-delimited services
`WebSocketApplication`	WebSocket via `ws`	Real-time browser apps, chat, live dashboards

All three accept { port, routers, debug, app_id } at minimum; see the per-class docs for full options:

http-server.md - KoaApplication
socket-server.md - SocketApplication
websocket-server.md - WebSocketApplication
examples.md - full server examples

Shared config keys

All three apps normalize config through Configuration from @axiosleo/cli-tool:

javascript

{
  port: 8080,            // Port to listen on
  listen_host: 'localhost', // '0.0.0.0' for public access (Koa only)
  routers: [],           // Array of Router instances
  app_id: '',            // Optional stable ID; auto uuid-v4 if empty
  debug: false           // Verbose logging
}

Shared events

All apps extend EventEmitter and emit:

starting - before the server binds
response - after each response is produced (framework uses this internally to write the response)

Socket apps also expose a separate app.event EventEmitter emitting:

connection - new client connected
listen - server bound to the port

Shared lifecycle

javascript

const app = new KoaApplication({ ... });
app.on('starting', () => console.log('about to listen'));
await app.start();       // all three classes implement .start()

Connection management (Socket + WebSocket)

SocketApplication implements the following methods, inherited by WebSocketApplication:

broadcast(data, msg, code, connections) - send to many; pass null for all
send(connection, data, msg, code) - send to one raw connection
close(connection) - close one raw connection
sendByConnectionId(id, data, msg, code) - send by tracked connection ID
closeByConnectionId(id) - close by tracked connection ID
getConnection(id) - returns the raw connection or null
ping(id) - send a ping payload to one connection

Connections are tracked in app.connections keyed by an auto-generated connection_id (_uuid_salt('connect:' + app_id)).

Show full SKILL.md (159 more words)Show less

Ping heartbeat

Socket apps support opt-in periodic ping:

javascript

new SocketApplication({
  port: 8081,
  routers: [root],
  ping: {
    open: true,              // default false
    interval: 1000 * 60 * 5, // default 5min
    data: 'this is a ping'
  }
});

When ping.open is true, the app broadcasts data to all active connections every interval ms.

Protocol differences

Aspect	Socket (TCP)	WebSocket
Request framing	`{...json}@@@@@@` delimiter	Plain JSON string
`send(conn, data)`	`conn.write(data + '@@@@@@')`	`conn.send(data)`
`close(conn)`	`conn.end()`	`conn.close()`
headers in context	none	`context.headers` (from upgrade request)

Common pitfalls

Calling new KoaApplication({ static: false }) disables the built-in static server. Set static: { rootDir: './public' } to enable it.
SocketApplication requires every inbound message to end with @@@@@@. Clients must append that delimiter.
WebSocketApplication.ping.open = true triggers broadcast every interval even when there are zero connections - the call is a no-op but still schedules.
Do not call app.start() inside a route handler - the app is already running at that point.

Quick jump

If you just need to build one server, start with the matching doc:

Building an HTTP API → http-server.md
Building a TCP service → socket-server.md
Building a WebSocket service → websocket-server.md
Copy-paste-ready examples → examples.md
Typing contexts and configs in TypeScript → koapp-typescript

Files

SKILL.md and 4 other files in assets/skills/koapp-apps of AxiosLeo/node-koapp.

SKILL.md
examples.md
http-server.md
socket-server.md
websocket-server.md

Open the folder on GitHubat commit 102955d

Compare with similar skills

Koapp Apps 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.

Koapp Apps compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Koapp Apps this skillAxiosLeo/node-koapp	145	—	~1.2k	Automated safety check: Pass	MIT	22 days ago
Supabase Development and Debuggingsupabase/agent-skills	2.7k	3 repos	~3.6k	Automated safety check: Pass	MIT	6 days ago
Use Yaakmountain-loop/yaak	19k	—	~1.9k	Automated safety check: Pass	MIT	yesterday
Gemini Live API Devgoogle-gemini/gemini-skills	4.3k	—	~4.6k	Automated safety check: Pass	Apache-2.0	yesterday
Web3 PolymarketPolymarket/agent-skills	191	2 repos	~2k	Automated safety check: Pass	None	7 mo ago
GraphQL ArchitectJeffallan/claude-skills	12k	1 repos	~1.3k	Automated safety check: Pass	MIT	4 days ago

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Questions about Koapp Apps

What does Koapp Apps do?

Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket. Koapp Apps is an agent skill from AxiosLeo/node-koapp. Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket.

When should I use Koapp Apps?

Koapp Apps fits situations like: building a server with koapp; configuring ports; managing socket connections; deciding between HTTP/TCP/WS transport.

How do I install Koapp Apps in Claude Code?

Run `npx skills add AxiosLeo/node-koapp --skill koapp-apps -a claude-code`. Or copy the skill folder (assets/skills/koapp-apps in AxiosLeo/node-koapp) into .claude/skills/koapp-apps in your project. Claude Code loads it when a task matches its description.

How do I install Koapp Apps in Codex?

Run `npx skills add AxiosLeo/node-koapp --skill koapp-apps -a codex`. Or copy the skill folder (assets/skills/koapp-apps in AxiosLeo/node-koapp) into .agents/skills/koapp-apps in your project. Codex loads it when a task matches its description.

Can I use Koapp Apps 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 AxiosLeo/node-koapp --skill koapp-apps -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/koapp-apps, .gemini/skills/koapp-apps, .github/skills/koapp-apps and .opencode/skills/koapp-apps in your project.

What does Koapp Apps need to run?

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

Does Koapp Apps 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 Koapp Apps 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 Koapp Apps use?

Koapp Apps 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 Koapp Apps use?

About 1.2k tokens (SKILL.md is roughly 4.7k 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 Koapp Apps?

Skills that share tags, products or a category with Koapp Apps: Supabase Development and Debugging (supabase/agent-skills, 2.7k stars), Use Yaak (mountain-loop/yaak, 19k stars), Gemini Live API Dev (google-gemini/gemini-skills, 4.3k stars) and Web3 Polymarket (Polymarket/agent-skills, 191 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Koapp Apps?

AxiosLeo (a GitHub user) maintains it in AxiosLeo/node-koapp, which has 145 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on September 16, 2026.

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

Install Koapp Apps

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

@axiosleo/koapp Application Classes

Which class do I need?

Shared config keys

Shared events

Shared lifecycle

Connection management (Socket + WebSocket)

Ping heartbeat

Protocol differences

Common pitfalls

Quick jump

Files

Compare with similar skills

Similar skills

More from AxiosLeo/node-koapp

Related

Questions about Koapp Apps