Agent skill

Skyll

Search and retrieve agent skills at runtime. An agent skill from assafelovic/skyll.

Apache-2.0Auto-check passedBackend & APIs

Install Skyll

skills CLI

$ npx skills add assafelovic/skyll --skill skyll -a claude-code

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

GitHub CLI

$ gh skill install assafelovic/skyll skyll --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/assafelovic/skyll.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skyll .claude/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .claude/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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/assafelovic/skyll/tree/main/skills/skyll

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 assafelovic/skyll --skill skyll -a codex

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

GitHub CLI

$ gh skill install assafelovic/skyll skyll --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/assafelovic/skyll.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skyll .agents/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .agents/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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 assafelovic/skyll --skill skyll -a cursor

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

GitHub CLI

$ gh skill install assafelovic/skyll skyll --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/assafelovic/skyll.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skyll .cursor/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .cursor/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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/assafelovic/skyll.git --path skills/skyll

--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 assafelovic/skyll --skill skyll -a gemini-cli

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

GitHub CLI

$ gh skill install assafelovic/skyll skyll --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/assafelovic/skyll.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skyll .gemini/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .gemini/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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 assafelovic/skyll skyll

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 assafelovic/skyll --skill skyll -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/assafelovic/skyll.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skyll .github/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .github/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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 assafelovic/skyll --skill skyll -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 assafelovic/skyll skyll --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/assafelovic/skyll.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skyll .opencode/skills/skyll && 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 "skyll" agent skill from https://github.com/assafelovic/skyll/tree/main/skills/skyll into .opencode/skills/skyll/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skyll", 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: skyll
GitHub stars: 247
Token cost: ~928 tokens
SKILL.md length: 257 words
Files: 1
Skills in repo: 1
Repo updated: Sep 26, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Search and retrieve agent skills at runtime. An agent skill from assafelovic/skyll.

Works in 3 steps: Search for relevant skills → Inject top skill into context → Use the skill's knowledge to complete…
Tasks that involve REST APIs
SKILL.md covers When to Use This Skill, Quick Usage, Response Format and Key Fields, plus 5 more sections
Calls curl and pip; reaches api.skyll.app

What it does

Skyll is an agent skill from assafelovic/skyll. Search and retrieve agent skills at runtime. This skill should be used when the agent needs to find specialized capabilities, workflows, or domain knowledge to accomplish a task. Skyll aggregates skills from skills.sh and returns full SKILL.md content ready for context injection.

Its SKILL.md is about 930 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 Backend & APIs, covering REST APIs. It works with Model Context Protocol. The repository describes itself as: A tool for autonomous agents like OpenClaw to discover and learn skills autonomously. The licence is Apache-2.0.

When your agent uses it

Tasks that involve REST APIs

Example prompts

“/skyll”

Requirements

Python 3

Workflow steps

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

Search for relevant skills
Inject top skill into context
Use the skill's knowledge to complete the task

What it can do on your machine

Read from SKILL.md and the folder at commit 3e0005d. 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:
- curl
- pip
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- api.skyll.app
Also links to:
- skyll.app
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

Skyll loads about 928 tokens when it runs. Until then it costs about 72 tokens; SKILL.md has 257 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~72
When it runs · the whole SKILL.md, loaded when a task matches: ~928

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 assafelovic/skyll at commit 3e0005d, republished under its Apache-2.0 licence (© assafelovic). 257 words, ~928 tokens.

Download SKILL.mdSave it as .claude/skills/skyll/SKILL.md (or your agent's skills folder).

name: skyll
description: Search and retrieve agent skills at runtime. This skill should be used when the agent needs to find specialized capabilities, workflows, or domain knowledge to accomplish a task. Skyll aggregates skills from skills.sh and returns full SKILL.md content ready for context injection.
license: Apache-2.0

Skyll - Agent Skill Discovery

Skyll enables agents to dynamically discover and retrieve skills at runtime. Instead of having all skills pre-loaded, agents can search for relevant skills on-demand and inject them into context.

When to Use This Skill

Use Skyll when:

The current task requires specialized knowledge or workflows not in context
Looking for best practices for a specific framework, library, or domain
Needing procedural knowledge for complex multi-step tasks
Wanting to enhance capabilities with community-contributed skills

Quick Usage

Option 1: Python Client (Recommended)

python

from skyll import Skyll

async with Skyll() as client:
    # Search for relevant skills
    skills = await client.search("react performance optimization", limit=3)
    
    for skill in skills:
        print(f"Skill: {skill.title}")
        print(f"Score: {skill.relevance_score}")
        print(skill.content)  # Full SKILL.md content

Option 2: REST API

Search for skills:

bash

curl "https://api.skyll.app/search?q=react+performance&limit=3"

Get a specific skill:

bash

curl "https://api.skyll.app/skills/anthropics/skills/skill-creator"

Response Format

The API returns ranked skills with relevance scores (0-100):

json

{
  "query": "react performance",
  "count": 3,
  "skills": [
    {
      "id": "react-best-practices",
      "title": "React Best Practices",
      "description": "Performance optimization for React and Next.js",
      "source": "vercel-labs/agent-skills",
      "relevance_score": 85.5,
      "install_count": 82800,
      "content": "# React Best Practices\n\n## Performance\n..."
    }
  ]
}

Key Fields

Field	Description
`id`	Skill identifier
`title`	Human-readable title
`description`	What the skill does
`source`	GitHub repository (owner/repo)
`relevance_score`	0-100 match score
`install_count`	Popularity from skills.sh
`content`	Full SKILL.md markdown content
`references`	Additional reference files (if requested)

Search Parameters

Parameter	Default	Description
`q` / `query`	required	Search query
`limit`	10	Max results (1-50)
`include_content`	true	Fetch full SKILL.md content
`include_references`	false	Include reference files

Example Workflow

When an agent needs to build a React Native app but lacks mobile expertise:

Search for relevant skills:

python

skills = await client.search("react native best practices", limit=2)

Inject top skill into context:

python

context = skills[0].content  # Full SKILL.md content

Use the skill's knowledge to complete the task

API Endpoints

Endpoint	Description
`GET /search?q={query}`	Search skills
`POST /search`	Search with JSON body
`GET /skills/{source}/{skill_id}`	Get specific skill
`GET /health`	Health check
`GET /docs`	Interactive API documentation

Installation

For Python agents:

bash

pip install skyll

For other languages, use the REST API directly at https://api.skyll.app.

Files

Just SKILL.md in skills/skyll of assafelovic/skyll.

Open the folder on GitHubat commit 3e0005d

Compare with similar skills

Skyll 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.

Skyll compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Skyll this skillassafelovic/skyll	247	—	~928	Automated safety check: Pass	Apache-2.0	12 days ago
OpenAPI to MCP Servermcp-use/mcp-use	11k	—	~5.2k	Automated safety check: Pass	Apache-2.0	today
Legbaevilsocket/legba	1.9k	—	~2.2k	Automated safety check: Pass	Custom licence	1 mo ago
Databuddydatabuddy-analytics/Databuddy	1.2k	—	~2.1k	Automated safety check: Pass	AGPL-3.0	yesterday
API Endpoint Contracttrycompai/comp	2k	—	~2.7k	Automated safety check: Pass	AGPL-3.0	yesterday
Cloudflare Email Servicehodgef/apiker	127	3 repos	~2k	Automated safety check: Pass	MIT	1 mo ago

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Works with

Model Context Protocol

Questions about Skyll

What does Skyll do?

Search and retrieve agent skills at runtime. An agent skill from assafelovic/skyll. Skyll is an agent skill from assafelovic/skyll. Search and retrieve agent skills at runtime.

When should I use Skyll?

Skyll fits situations like: tasks that involve REST APIs.

How do I install Skyll in Claude Code?

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

How do I install Skyll in Codex?

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

Can I use Skyll 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 assafelovic/skyll --skill skyll -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skyll, .gemini/skills/skyll, .github/skills/skyll and .opencode/skills/skyll in your project.

What does Skyll need to run?

Going by SKILL.md and its folder, Skyll needs the command-line tools its instructions call (curl and pip). Our summary lists: Python 3.

Does Skyll access the network?

SKILL.md names 2 domains. In commands or code: api.skyll.app; the agent is likely to contact it when it follows the instructions. As links in the text: skyll.app. This is read from the text; nothing was executed.

Is Skyll 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 Skyll use?

Skyll is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Skyll use?

About 928 tokens (SKILL.md is roughly 3.7k 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 Skyll?

Skills that share tags, products or a category with Skyll: OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars), Legba (evilsocket/legba, 1.9k stars), Databuddy (databuddy-analytics/Databuddy, 1.2k stars) and API Endpoint Contract (trycompai/comp, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skyll?

assafelovic (a GitHub user) maintains it in assafelovic/skyll, which has 247 GitHub stars. The repository was last updated on September 26, 2026.

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

Install Skyll

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Skyll - Agent Skill Discovery

When to Use This Skill

Quick Usage

Option 1: Python Client (Recommended)

Option 2: REST API

Response Format

Key Fields

Search Parameters

Example Workflow

API Endpoints

Installation

Links

Files

Compare with similar skills

Similar skills

OpenAPI to MCP Server

Legba

Databuddy

API Endpoint Contract

Cloudflare Email Service

Pixiu MCP Gateway

Related

Questions about Skyll