Skill Creator
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
Scaffold and formally review a new Agent Skill in this marketplace repo.
Install Skill Authoring Lifecycle
$ npx skills add Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Arenukvern/mcp_flutter skill-authoring-lifecycle --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/Arenukvern/mcp_flutter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .claude/skills/skill-authoring-lifecycle && 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 "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .claude/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycleType 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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Arenukvern/mcp_flutter skill-authoring-lifecycle --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Arenukvern/mcp_flutter.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .agents/skills/skill-authoring-lifecycle && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .agents/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Arenukvern/mcp_flutter skill-authoring-lifecycle --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Arenukvern/mcp_flutter.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .cursor/skills/skill-authoring-lifecycle && 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 "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .cursor/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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/Arenukvern/mcp_flutter.git --path .agents/skills/skill-authoring-lifecycle--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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Arenukvern/mcp_flutter skill-authoring-lifecycle --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Arenukvern/mcp_flutter.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .gemini/skills/skill-authoring-lifecycle && 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 "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .gemini/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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 Arenukvern/mcp_flutter skill-authoring-lifecycleInstalls 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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Arenukvern/mcp_flutter.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .github/skills/skill-authoring-lifecycle && 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 "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .github/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Arenukvern/mcp_flutter skill-authoring-lifecycle --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Arenukvern/mcp_flutter.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/skill-authoring-lifecycle .opencode/skills/skill-authoring-lifecycle && 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 "skill-authoring-lifecycle" agent skill from https://github.com/Arenukvern/mcp_flutter/tree/main/.agents/skills/skill-authoring-lifecycle into .opencode/skills/skill-authoring-lifecycle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-authoring-lifecycle", 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
skill-authoring-lifecycle- GitHub stars
- 386
- Token cost
- ~1.5k tokens
- SKILL.md length
- 645 words
- Files
- 5 (incl. references)
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- MIT
At a glance
Scaffold and formally review a new Agent Skill in this marketplace repo.
- Works in 3 steps: Creation Workflow → Review & Audit Checklist → Deprecation & Renaming (Changesets)
- Validating frontmatter
- SKILL.md covers When to use, Phase 1: Creation Workflow, Frontmatter template and Phase 2: Review & Audit…, plus 4 more sections
- Calls npx and pnpm
What it does
Skill Authoring Lifecycle is an agent skill from Arenukvern/mcp_flutter. Scaffold and formally review a new Agent Skill in this marketplace repo. Covers valid SKILL.md generation, directory layout, registry entries, and spec auditing. Use when adding a skill, validating frontmatter, or checking marketplace readiness before a PR.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `evals/cases/infra-request-dormant.yaml`, `evals/cases/new-marketplace-skill.yaml` and `references/evals.md`).
It sits in Agent Workflows, covering Skill authoring. The repository describes itself as: MCP Toolkit for Flutter AI Agent Driven Development (MCP/CLI + custom client side tools) - via closed feedback loop (visual & semantic snapshot) and high client side… The licence is MIT.
When your agent uses it
- Validating frontmatter
- Checking marketplace readiness before a PR
Example prompts
- “/skill-authoring-lifecycle”
Requirements
- Node.js
- Docker
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 62f3ee1. 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:
npxpnpm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npx and pnpm, 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
Skill Authoring Lifecycle loads about 1.5k tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 71 tokens; SKILL.md has 645 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
The full file from Arenukvern/mcp_flutter at commit 62f3ee1, republished under its MIT licence (© Arenukvern). 645 words, ~1,512 tokens.
Download SKILL.mdSave it as
.claude/skills/skill-authoring-lifecycle/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- skill-authoring-lifecycle
- description
- Scaffold and formally review a new Agent Skill in this marketplace repo. Covers valid SKILL.md generation, directory layout, registry entries, and spec auditing. Use when adding a skill, validating frontmatter, or checking marketplace readiness before a PR.
- license
- MIT
- type
- governance
- metadata.author
- skill-steward
- metadata.version
- 1.1.0
- metadata.category
- marketplace
- paths
- skills/**/SKILL.md, **/SKILL.md
Skill authoring lifecycle
Add, review, and validate an installable skill package under skills/ in the Skill Steward marketplace.
When to use
- User wants a new skill in this repo
- "Review this skill" or "Is this SKILL.md valid?"
- Bootstrapping
SKILL.mdfornpx skillscompatibility - PR touches
skills/*/SKILL.md
Phase 1: Creation Workflow
- Verify intent — Does the intent overlap with an existing skill? Merge into an existing skill if they serve the same high-level goal or are two halves of the same lifecycle (ADR 0016).
- Collect examples — Write 2–3 concrete user prompts that should trigger the skill and 1 prompt that should not. Skip only when the request already supplies clear usage patterns.
- Plan resources — Decide whether the skill needs instructions only,
scripts/for repeated or fragile operations,references/for detailed knowledge, orassets/for templates/static files. - Choose a name —
kebab-case, 1–64 chars, matches Agent Skills rules (seedocs/STANDARDS.mdx). - Create directory —
skills/{name}/(directory name must equalnamein frontmatter). - Copy template — from
templates/skill/SKILL.md; replace placeholders. - Write description — one concise block covering what and when (trigger phrases users say). Activation-critical routing belongs here, not only in a body "When to use" section.
- Cite sources — create
references/sources.mdfromtemplates/skill/references/sources.md; add rows for every spec/repo/paper used. - Write body — numbered steps, examples, output format; keep under 500 lines.
- Evals — T1 behavior-critical skills (see STANDARDS):
references/evals.md+ ≥2evals/cases/*.yaml. Others: optionalevals.md. - Optional metadata — add
agents/openai.yamlonly when Codex app UI metadata, invocation policy, or tool dependencies are useful. - Optional resources — create only the needed
scripts/,references/, andassets/directories; delete placeholder resources. - Register skill:
- Add skill id to
skills.sh.jsonusing the current repo schema. - Add row to root
README.mdskill table.
- Forward-test tricky skills — For broad or fragile workflows, use a fresh subagent/thread with a natural user prompt and raw artifacts. Do not leak the intended answer, suspected bug, or planned fix into the validation prompt.
Frontmatter template
---
name: {same-as-directory}
description: {capability + trigger phrases, 20-1024 chars}
license: MIT
type: governance
metadata:
author: skill-steward
version: "1.0.0"
category: {marketplace|multi-agent|...}
---Phase 2: Review & Audit Checklist
Review a skill package before merge or publish to skills.sh.
Skill Cohesion
- Complete lifecycle: The skill covers a complete journey (e.g., creating + validating) rather than forcing an agent to switch tools mid-task.
- Mechanics included: Abstract rules or culture guidelines are bundled alongside the mechanical tools that enforce them.
Show full SKILL.md (268 more words)Show less
Structure
- Directory name is
kebab-caseand matchesnamein frontmatter - File is exactly
SKILL.md(case-sensitive) - No
README.mdinside the skill folder (usereferences/)
Frontmatter
-
name: 1–64 chars,[a-z0-9-], no leading/trailing-, no-- -
description: 1–1024 chars, states capability and when to activate -
licenseset if not repo MIT -
metadata.versionandmetadata.author -
compatibilityif skill needs git, network, docker, or a specific product -
agents/openai.yamlpresent only when Codex-specific UI/policy/dependency metadata is useful
Body
- Clear numbered workflow
- Under ~500 lines (or split to
references/) - Relative file links one level deep
-
references/sources.mdwith URLs for external claims - Install command documented:
npx skills add arenukvern/skill_steward --skill <name>
Scripts (if present)
- Shebang present (
bashornode) -
set -euo pipefailfor bash - stderr for logs, stdout for machine-readable output
- Representative scripts were actually run, or skipped with a recorded reason
Registry (this repo)
- Skill id in
skills.sh.json - Row in root
README.mdtable -
pnpm run validatepasses (nosources.mdwarning) - T1 behavior-critical:
evals/cases/*.yaml+pnpm run eval
Phase 3: Deprecation & Renaming (Changesets)
We do not keep permanent "tombstone" skills, as they clutter the repository. Instead, we treat skill renames and merges as breaking API changes and communicate them using standard ecosystem tooling (Changesets).
When renaming or merging a skill:
- Safely
rm -rfthe old skill directory. - Remove the old skill from
skills.sh.jsonandREADME.md. - Generate a changeset (
pnpm changeset) documenting the deletion, or manually create a.changeset/skill-consolidation.mdfile. Explain clearly why it was removed and which skill replaces it. - Agents and users reading the changelog will automatically see the redirection.
Output format for Reviews
Report as:
## Summary
{pass | needs changes}
## Errors (blocking)
...
## Warnings
...Install
npx skills add arenukvern/skill_steward --skill skill-authoring-lifecycleSources
See references/sources.md. When researching, follow skill-source-citations.
© Arenukvern, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (references) in .agents/skills/skill-authoring-lifecycle of Arenukvern/mcp_flutter.
- SKILL.md
- evals/cases/infra-request-dormant.yaml
- evals/cases/new-marketplace-skill.yaml
- references/evals.md
- references/sources.md
Open the folder on GitHubat commit 62f3ee1
Compare with similar skills
Skill Authoring Lifecycle 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 |
|---|---|---|---|---|---|---|
| Skill Authoring Lifecycle this skillArenukvern/mcp_flutter | 386 | — | ~1.5k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 795 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase | 10k | 11 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Darwin Skill Optimizeralchaincyf/darwin-skill | 6.2k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Claude Code Command Developmentanthropics/claude-plugins-official | 38k | 10 repos | ~4.8k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Plugin Structureanthropics/claude-plugins-official | 38k | 10 repos | ~3.4k | Automated safety check: Pass | Apache-2.0 |
Similar skills
- Official
Claude Code Skill Developer Guide
diet103/claude-code-infrastructure-showcase
A guide to creating and managing Claude Code skills with auto-activation: skill-rules.json triggers, hooks, enforcement levels, YAML frontmatter and progressive disclosure.
Darwin Skill Optimizer
alchaincyf/darwin-skill
Scores SKILL.md files on a nine-dimension rubric, then improves them in a keep-or-revert loop with independent judge agents, test prompts, git history and human checkpoints.
- Official
Claude Code Command Development
anthropics/claude-plugins-official
Explains how to write Claude Code slash commands: Markdown files with YAML frontmatter, arguments, file references, bash context and interactive prompts.
- Official
Claude Code Plugin Structure
anthropics/claude-plugins-official
Explains the directory layout, plugin.json manifest and component organization of a Claude Code plugin, including auto-discovery and portable paths.
Skill Release Gate
rohitg00/ai-engineering-from-scratch
Evaluates an Agent Skill bundle before release for structure, trigger quality, artifact improvement, script correctness, safety, installed-tree integrity and host portability.
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Mixture Of Experts
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Run a Mixture of Experts (MoE) audit on any topic, plan, codebase, evidence archive, or process.
Multi Agent Handoff
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Plugin Marketplace Setup
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Release Changelog Harness
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Chooses ecosystem-native release and changelog tooling (Changesets, Melos, release-plz) plus binary distribution (GitHub Release tarballs, install.sh) when the product is an executable.
Repository Governance Lifecycle
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Master orchestration for repository governance, North Star impact, sub-Star boundaries, and repair-first or evidence-first drift checks.
Related
Categories
Questions about Skill Authoring Lifecycle
What does Skill Authoring Lifecycle do?
Scaffold and formally review a new Agent Skill in this marketplace repo. Skill Authoring Lifecycle is an agent skill from Arenukvern/mcp_flutter. Scaffold and formally review a new Agent Skill in this marketplace repo.
When should I use Skill Authoring Lifecycle?
Skill Authoring Lifecycle fits situations like: validating frontmatter; checking marketplace readiness before a PR.
How do I install Skill Authoring Lifecycle in Claude Code?
Run `npx skills add Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a claude-code`. Or copy the skill folder (.agents/skills/skill-authoring-lifecycle in Arenukvern/mcp_flutter) into .claude/skills/skill-authoring-lifecycle in your project. Claude Code loads it when a task matches its description.
How do I install Skill Authoring Lifecycle in Codex?
Run `npx skills add Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a codex`. Or copy the skill folder (.agents/skills/skill-authoring-lifecycle in Arenukvern/mcp_flutter) into .agents/skills/skill-authoring-lifecycle in your project. Codex loads it when a task matches its description.
Can I use Skill Authoring Lifecycle 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 Arenukvern/mcp_flutter --skill skill-authoring-lifecycle -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-authoring-lifecycle, .gemini/skills/skill-authoring-lifecycle, .github/skills/skill-authoring-lifecycle and .opencode/skills/skill-authoring-lifecycle in your project.
What does Skill Authoring Lifecycle need to run?
Going by SKILL.md and its folder, Skill Authoring Lifecycle needs the command-line tools its instructions call (npx and pnpm). Our summary lists: Node.js; Docker.
Does Skill Authoring Lifecycle access the network?
SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Skill Authoring Lifecycle 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 Skill Authoring Lifecycle use?
Skill Authoring Lifecycle is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Skill Authoring Lifecycle use?
About 1.5k tokens (SKILL.md is roughly 6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 403 tokens, read only when the agent opens those files.
What are the alternatives to Skill Authoring Lifecycle?
Skills that share tags, products or a category with Skill Authoring Lifecycle: Skill Creator (Azure/azqr, 795 stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars) and Claude Code Command Development (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Authoring Lifecycle?
Arenukvern (a GitHub user) maintains it in Arenukvern/mcp_flutter, which has 386 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 3, 2026.
Source: Arenukvern/mcp_flutter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.