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Agent skill

Artifact Creator

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications.

MITAuto-check passedAgent Workflows

Install Artifact Creator

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-creator -a claude-code

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

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace artifact-creator --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/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/artifact-creator .claude/skills/artifact-creator && 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/

Facts

Skill name
artifact-creator
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
547 words
Files
4 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications.

  • Works in 8 steps: Read project instructions and inspect… → Classify the artifact using → Establish the current authority → …
  • Building reusable agent capabilities
  • SKILL.md covers Overview, When to use, Prerequisites and Instructions, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Artifact Creator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications. Use when building reusable agent capabilities or consolidating creator tooling without inventing a universal host format. Trigger with "create an agent skill", "build a plugin", "create an MCP server", "add a subagent", or "scaffold an agent integration".

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, including reference files (for example `eval-spec.yaml`, `references/artifact-contracts.md` and `references/host-adapters.md`). Compatibility notes: Agent Skills-compatible hosts; host-specific artifacts require their native specification

It sits in Agent Workflows, covering MCP servers and Subagents. It works with Model Context Protocol. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Building reusable agent capabilities
  • Consolidating creator tooling without inventing a universal host format
  • With create an agent skill
  • Create an MCP server

Example prompts

  • “create an agent skill”
  • “build a plugin”
  • “create an MCP server”
  • “/artifact-creator”

Requirements

  • Compatibility (from SKILL.md): Agent Skills-compatible hosts; host-specific artifacts require their native specification
  • Pre-approved tools (allowed-tools): Read, Write, Edit

Workflow steps

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

  1. Read project instructions and inspect the target tree before choosing a
  2. Classify the artifact using
  3. Establish the current authority
  4. Derive least privilege from the actual workflow. Do not copy a broad tool
  5. Create only useful files. A skill requires SKILL.md; add scripts when
  6. For MCP work, define tools around bounded user outcomes. Validate every
  7. For host adapters, follow
  8. Validate with artifact-validator, run focused tests, and report unresolved

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    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.

  • Compatibility

    Agent Skills-compatible hosts; host-specific artifacts require their native specification

    From compatibility in the SKILL.md frontmatter.

Context cost

Artifact Creator loads about 1.2k tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 110 tokens; SKILL.md has 547 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~110
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

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 jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 547 words, ~1,246 tokens.

Download SKILL.mdSave it as .claude/skills/artifact-creator/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
artifact-creator
description
Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications. Use when building reusable agent capabilities or consolidating creator tooling without inventing a universal host format. Trigger with "create an agent skill", "build a plugin", "create an MCP server", "add a subagent", or "scaffold an agent integration".
allowed-tools
Read, Write, Edit
compatibility
Agent Skills-compatible hosts; host-specific artifacts require their native specification
version
1.0.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
tags
agent-skills, creation, plugins, agents, mcp, hooks

Artifact Creator

Create the smallest complete artifact that satisfies the user's requested runtime and security boundary. Keep portable instructions separate from host packaging.

Overview

There is one portable Agent Skills contract, one open MCP protocol, and many different plugin, agent, hook, permission, and marketplace formats. This skill selects the correct authority before writing files and prevents host-specific details from leaking into the portable core.

When to use

Use for a new or substantially revised skill, subagent, plugin, MCP integration, hook, or marketplace entry. For a production modernization involving research, migration, security review, and release evidence, use production-upgrade instead. For review without changes, use artifact-validator.

Prerequisites

  • The requested outcome and target repository or destination.
  • Existing project instructions and the target host's current specification.
  • Authorization for any local writes. Creation does not imply permission to install, publish, deploy, open a PR, or merge.

The pre-authorized Read, Write, and Edit capabilities apply only to local files inside the user-selected target. Every network, shell, installation, and external mutation capability remains behind host and project approval.

Instructions

  1. Read project instructions and inspect the target tree before choosing a format. Preserve generated-file ownership and existing public identifiers.
  2. Classify the artifact using references/artifact-contracts.md. If the request mixes a portable skill with host wiring, design the portable skill first and the host adapter second.
  3. Establish the current authority:
    • Agent Skill: the open Agent Skills specification plus any declared local overlay.
    • MCP server: the Model Context Protocol specification and selected SDK.
    • Plugin, subagent, hook, command, or catalog: the target host's current specification.
    • This marketplace: repository instructions and its canonical validators.
  4. Derive least privilege from the actual workflow. Do not copy a broad tool list from another artifact. Separate read-only analysis from mutations.
  5. Create only useful files. A skill requires SKILL.md; add scripts when deterministic execution matters, references for conditional depth, assets for output material, and evals for behavior that needs proof.
  6. For MCP work, define tools around bounded user outcomes. Validate every input, cap output and retries, redact secrets, separate reads from writes, and require explicit confirmation for high-impact mutations.
  7. For host adapters, follow references/host-adapters.md. Do not claim another runtime is supported merely because it can read Markdown.
  8. Validate with artifact-validator, run focused tests, and report unresolved assumptions and operations that still require approval.
Show full SKILL.md (164 more words)Show less

Output

Return the created paths, the authority used for each artifact, validation commands and results, support limitations, and the next authorization boundary.

Error handling

  • If the target host is unknown, create only the portable Agent Skill and leave host packaging unclaimed.
  • If current official documentation conflicts with repository policy, stop and surface the conflict at the owning authority.
  • If a secret, destructive default, unbounded retry, path escape, or unsupported runtime claim appears, fail closed and do not scaffold around it.
  • If the destination already exists, preserve it and propose an update or migration; never overwrite without explicit authorization.

Examples

  • "Create a skill that audits release readiness" produces one portable skill and only the resources required by its checks.
  • "Build a Goose skill" produces a portable Agent Skill and verifies Goose's native path before offering installation instructions.
  • "Create an MCP server and Claude plugin" designs the server against MCP and treats the Claude plugin configuration as a separate adapter.

Resources

© jeremylongshore, 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 3 other files (references) in skills/.curated/artifact-creator of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • eval-spec.yaml
  • references/artifact-contracts.md
  • references/host-adapters.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Artifact Creator 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.

Artifact Creator compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Artifact Creator this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
Claude Automation Recommenderanthropics/claude-plugins-official38k3 repos~2.7kAutomated safety check: NotesApache-2.0
CC Workflow Studio AI Editorbreaking-brake/cc-wf-studio5.4k—~561Automated safety check: PassCustom licence
Agent Deckasheshgoplani/agent-deck1.1k—~1.8kAutomated safety check: PassMIT
Ruflo Multi-Agent Orchestrationruvnet/ruflo74k1 repos~975Automated safety check: PassMIT
Bootstrapinfragate/capa724—~5.9kAutomated safety check: PassMIT

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Works with

Categories

Questions about Artifact Creator

What does Artifact Creator do?

Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications. Artifact Creator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Create or revise Agent Skills, host plugins and subagents, MCP servers and client configurations, hooks, and marketplace catalogs against their actual specifications.

When should I use Artifact Creator?

Artifact Creator fits situations like: building reusable agent capabilities; consolidating creator tooling without inventing a universal host format; with create an agent skill; create an MCP server.

How do I install Artifact Creator in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-creator -a claude-code`. Or copy the skill folder (skills/.curated/artifact-creator in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/artifact-creator in your project. Claude Code loads it when a task matches its description.

How do I install Artifact Creator in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-creator -a codex`. Or copy the skill folder (skills/.curated/artifact-creator in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/artifact-creator in your project. Codex loads it when a task matches its description.

Can I use Artifact Creator 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 jeremylongshore/tons-of-skills-marketplace --skill artifact-creator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/artifact-creator, .gemini/skills/artifact-creator, .github/skills/artifact-creator and .opencode/skills/artifact-creator in your project.

What does Artifact Creator need to run?

SKILL.md names no scripts, command-line tools or credentials: Artifact Creator is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit. Compatibility (from SKILL.md): Agent Skills-compatible hosts; host-specific artifacts require their native specification.

Does Artifact Creator 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 Artifact Creator 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 Artifact Creator use?

Artifact Creator 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 Artifact Creator use?

About 1.2k tokens (SKILL.md is roughly 5k 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 1k tokens, read only when the agent opens those files.

What are the alternatives to Artifact Creator?

Skills that share tags, products or a category with Artifact Creator: Claude Automation Recommender (anthropics/claude-plugins-official, 38k stars), CC Workflow Studio AI Editor (breaking-brake/cc-wf-studio, 5.4k stars), Agent Deck (asheshgoplani/agent-deck, 1.1k stars) and Ruflo Multi-Agent Orchestration (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Artifact Creator?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.