Agent skill

Koapp Sse

Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware.

Install Koapp Sse

skills CLI

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

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

GitHub CLI

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

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-sse -a codex

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

GitHub CLI

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

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

GitHub CLI

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

--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-sse -a gemini-cli

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

GitHub CLI

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

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-sse -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-sse .github/skills/koapp-sse && 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-sse" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-sse into .github/skills/koapp-sse/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-sse", 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-sse -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-sse --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-sse .opencode/skills/koapp-sse && 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-sse" agent skill from https://github.com/AxiosLeo/node-koapp/tree/main/assets/skills/koapp-sse into .opencode/skills/koapp-sse/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "koapp-sse", 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-sse
GitHub stars: 145
Token cost: ~1.5k tokens
SKILL.md length: 479 words
Files: 2
Skills in repo: 8
Repo updated: Sep 16, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware.

Works in 4 steps: Call await sse(context.koa, async () =>… → After that, context.koa.sse exists. → Push events with… → …
Pushing real-time events to a browser over HTTP
SKILL.md covers Import, Middleware factory, Wiring into a router handler and Event shape, plus 7 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Koapp Sse is an agent skill from AxiosLeo/node-koapp. Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware. Use when pushing real-time events to a browser over HTTP, implementing progress bars, live logs, notifications, or EventSource endpoints with text/event-stream, including ctx.koa.sse.send/close/keepAlive APIs.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `examples.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

Pushing real-time events to a browser over HTTP
Implementing progress bars
EventSource endpoints with text/event-stream
Including ctx.koa.sse.send/close/keepAlive APIs

Example prompts

“/koapp-sse”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Call await sse(context.koa, async () => {}) - pass a no-op next.
After that, context.koa.sse exists.
Push events with context.koa.sse.send(event); end with .close().
Do not call success / failed / result in the same handler - SSE

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 Sse loads about 1.5k tokens when it runs. Until then it costs about 78 tokens; SKILL.md has 479 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~78
When it runs · the whole SKILL.md, loaded when a task matches: ~1.5k

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). 479 words, ~1,513 tokens.

Download SKILL.mdSave it as .claude/skills/koapp-sse/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: koapp-sse
description: Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware. Use when pushing real-time events to a browser over HTTP, implementing progress bars, live logs, notifications, or EventSource endpoints with text/event-stream, including ctx.koa.sse.send/close/keepAlive APIs.

@axiosleo/koapp Server-Sent Events Middleware

Source: src/middlewares/sse.js.

KoaSSEMiddleware upgrades a Koa request to a Server-Sent Events (SSE) stream, setting the right headers and exposing ctx.sse.send(...) for pushing events to the browser over plain HTTP.

Use SSE when:

You need server → client streaming (notifications, logs, live charts)
You do NOT need client → server streaming (use koapp-apps WebSocket instead)
You want a simple, proxy-friendly transport - SSE works over HTTP/1.1

Browsers reconnect automatically; most reverse proxies handle it fine.

Import

javascript

const { KoaSSEMiddleware } = require('@axiosleo/koapp').middlewares;

Middleware factory

javascript

const middleware = KoaSSEMiddleware({
  pingInterval: 60000,  // ms between heartbeat comments (default 60s)
  closeEvent: 'close'   // event name sent on stream close
});

The factory returns a standard Koa middleware (ctx, next) => {}.

Wiring into a router handler

Because the framework already dispatches routes via its workflow, invoke the middleware inside the handler, passing context.koa:

javascript

const { Router } = require('@axiosleo/koapp');
const { KoaSSEMiddleware } = require('@axiosleo/koapp').middlewares;

const router = new Router('/');

router.any('/sse', async (context) => {
  const sse = KoaSSEMiddleware();
  await sse(context.koa, async () => {});

  context.koa.sse.send({ data: 'hello, world!' });

  process.nextTick(async () => {
    for (let i = 0; i < 5; i++) {
      context.koa.sse.send({ id: i, event: 'tick', data: { i } });
      await new Promise((r) => setTimeout(r, 1000));
    }
    context.koa.sse.close();
  });
});

Key points:

Call await sse(context.koa, async () => {}) - pass a no-op next.
After that, context.koa.sse exists.
Push events with context.koa.sse.send(event); end with .close().
Do not call success / failed / result in the same handler - SSE takes over the response body.

Event shape

sse.send(data) accepts either a string or an object:

javascript

// String payload - becomes `data:<text>\n\n`
context.koa.sse.send('hello');

// Object payload - id/event are optional
context.koa.sse.send({
  id: 42,
  event: 'progress',
  data: { percent: 75 }  // objects are JSON-stringified
});

Raw wire output:

id:42
event:progress
data:{"percent":75}

Lifecycle methods

Method	When to use
`ctx.sse.send(data)`	Push one event
`ctx.sse.keepAlive()`	Send a `:\n\n` comment to keep the connection warm (called automatically every `pingInterval` ms for all active streams)
`ctx.sse.close()`	Emit a final `{ event: closeEvent }` and end the stream

The middleware maintains an internal ssePool and calls keepAlive on every registered stream every pingInterval ms. Manual calls are rarely needed.

Reacting to client disconnect

The middleware listens to close / error events on the SSE stream and calls an internal close() that:

Removes the stream from the pool
unpipe() + destroy() the stream
Ends the Koa response
Destroys the underlying socket

You can listen yourself too:

javascript

context.koa.sse.on('close', () => {
  clearInterval(myPushLoop);
});

Show full SKILL.md (211 more words)Show less

Long-lived handlers

The handler function must remain alive while the SSE stream is open. Don't return from it immediately; either keep pushing inline, or spawn a background task and let it own the lifecycle:

javascript

router.any('/logs', async (context) => {
  const sse = KoaSSEMiddleware();
  await sse(context.koa, async () => {});

  // Detach so the handler resolves but the stream stays open
  (async () => {
    for await (const line of tail('./app.log')) {
      context.koa.sse.send({ event: 'log', data: line });
    }
    context.koa.sse.close();
  })();
});

The framework's workflow will see the handler resolve, but the response body (the SSE stream) remains open until you close() it or the client disconnects.

Browser client

javascript

const source = new EventSource('/sse');

source.onmessage = (e) => {
  console.log('data:', e.data);
};

source.addEventListener('progress', (e) => {
  const payload = JSON.parse(e.data);
  console.log('progress:', payload.percent);
});

source.addEventListener('close', () => {
  console.log('server closed the stream');
  source.close();
});

Browsers automatically reconnect on network blips.

Pairing with other koapp pieces

Validate the upgrade with a router-level validator on query (e.g. auth token) - koapp-router
Authenticate via session cookie - the middleware does not touch auth
Control backpressure by only pushing when context.koa.sse.writable

Common pitfalls

Calling success / failed / result / context.koa.body = ... in the same handler conflicts with the SSE stream and yields incomplete output.
Using HTTP/2 requires enabling SSE on the server side - the default Node HTTP/1.1 works out of the box.
Firewall / proxy buffering can delay events. Set X-Accel-Buffering: no for nginx:
javascript
```
context.koa.set('X-Accel-Buffering', 'no');
```
Do this before calling sse(context.koa, ...).
The middleware's global setInterval heartbeat keeps all open SSE connections warm; it does not leak across requests because each stream auto-removes itself from the pool on close.

Files

SKILL.md and 1 other file in assets/skills/koapp-sse of AxiosLeo/node-koapp.

SKILL.md
examples.md

Open the folder on GitHubat commit 102955d

Compare with similar skills

Koapp Sse 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 Sse compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Koapp Sse this skillAxiosLeo/node-koapp	145	—	~1.5k	Automated safety check: Pass	MIT	24 days ago
Supabase Development and Debuggingsupabase/agent-skills	2.7k	3 repos	~3.6k	Automated safety check: Pass	MIT	8 days ago
Use Yaakmountain-loop/yaak	19k	—	~1.9k	Automated safety check: Pass	MIT	3 days ago
Gemini Live API Devgoogle-gemini/gemini-skills	4.3k	—	~4.6k	Automated safety check: Pass	Apache-2.0	4 days ago
Broker Integrationmarketcalls/openalgo	2.8k	—	~4.7k	Automated safety check: Notes	AGPL-3.0	yesterday
Trigger.dev Realtimepapermark/papermark	9.2k	—	~1.7k	Automated safety check: Pass	Custom licence	1 mo ago

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Questions about Koapp Sse

What does Koapp Sse do?

Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware. Koapp Sse is an agent skill from AxiosLeo/node-koapp. Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware.

When should I use Koapp Sse?

Koapp Sse fits situations like: pushing real-time events to a browser over HTTP; implementing progress bars; eventSource endpoints with text/event-stream; including ctx.koa.sse.send/close/keepAlive APIs.

How do I install Koapp Sse in Claude Code?

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

How do I install Koapp Sse in Codex?

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

Can I use Koapp Sse 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-sse -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-sse, .gemini/skills/koapp-sse, .github/skills/koapp-sse and .opencode/skills/koapp-sse in your project.

What does Koapp Sse need to run?

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

Does Koapp Sse 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 Sse 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 Sse use?

Koapp Sse 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 Sse use?

About 1.5k tokens (SKILL.md is roughly 6.1k 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 Sse?

Skills that share tags, products or a category with Koapp Sse: 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 Broker Integration (marketcalls/openalgo, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Koapp Sse?

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 Sse

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

@axiosleo/koapp Server-Sent Events Middleware

Import

Middleware factory

Wiring into a router handler

Event shape

Lifecycle methods

Reacting to client disconnect

Long-lived handlers

Browser client

Pairing with other koapp pieces

Common pitfalls

See also

Files

Compare with similar skills

Similar skills

More from AxiosLeo/node-koapp

Related

Questions about Koapp Sse