Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
A skill your agent uses when creating specialized subagents for Claude Code plugins or the Task tool - covers description writing for auto-delegation, tool selection, prompt structure, and testing…
Install Creating An Agent
$ npx skills add ed3dai/ed3d-plugins --skill creating-an-agent -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ed3dai/ed3d-plugins creating-an-agent --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/ed3dai/ed3d-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .claude/skills/creating-an-agent && 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 "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .claude/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agentType 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 ed3dai/ed3d-plugins --skill creating-an-agent -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ed3dai/ed3d-plugins creating-an-agent --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ed3dai/ed3d-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .agents/skills/creating-an-agent && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .agents/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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 ed3dai/ed3d-plugins --skill creating-an-agent -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ed3dai/ed3d-plugins creating-an-agent --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ed3dai/ed3d-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .cursor/skills/creating-an-agent && 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 "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .cursor/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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/ed3dai/ed3d-plugins.git --path plugins/ed3d-extending-claude/skills/creating-an-agent--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 ed3dai/ed3d-plugins --skill creating-an-agent -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ed3dai/ed3d-plugins creating-an-agent --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ed3dai/ed3d-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .gemini/skills/creating-an-agent && 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 "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .gemini/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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 ed3dai/ed3d-plugins creating-an-agentInstalls 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 ed3dai/ed3d-plugins --skill creating-an-agent -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ed3dai/ed3d-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .github/skills/creating-an-agent && 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 "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .github/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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 ed3dai/ed3d-plugins --skill creating-an-agent -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ed3dai/ed3d-plugins creating-an-agent --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ed3dai/ed3d-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/ed3d-extending-claude/skills/creating-an-agent .opencode/skills/creating-an-agent && 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 "creating-an-agent" agent skill from https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/creating-an-agent into .opencode/skills/creating-an-agent/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "creating-an-agent", 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
creating-an-agent- GitHub stars
- 250
- Token cost
- ~2k tokens
- SKILL.md length
- 509 words
- Files
- 1
- Skills in repo
- 34
- Repo updated
- First seen
- Licence
- None found
At a glance
A skill your agent uses when creating specialized subagents for Claude Code plugins or the Task tool - covers description writing for auto-delegation, tool selection, prompt structure, and testing…
- Works in 4 steps: Baseline Test → Agent Test → Edge Case Testing → …
- Creating specialized subagents for Claude Code plugins
- SKILL.md covers What is an Agent?, When to Create an Agent, Agent File Structure and Description: The Critical Field, plus 7 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Creating An Agent is an agent skill from ed3dai/ed3d-plugins. Use when creating specialized subagents for Claude Code plugins or the Task tool - covers description writing for auto-delegation, tool selection, prompt structure, and testing agents
Its SKILL.md is about 2k 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 Agent Workflows, covering Subagents and Hooks and plugins. It works with Bash. The repository describes itself as: Ed's repo of Claude Code plugins, centered around a research-plan-implement workflow. Only a tiny bit cursed. If you're lucky.
When your agent uses it
- Creating specialized subagents for Claude Code plugins
- The Task tool - covers description writing for auto-delegation
- Prompt structure
Example prompts
- “/creating-an-agent”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Baseline Test
- Agent Test
- Edge Case Testing
- Iteration
What it can do on your machine
Read from SKILL.md and the folder at commit 0c90f4b. 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 markdown and yaml).
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
Creating An Agent loads about 2k tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 509 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 509 words (~2,027 tokens).
“REQUIRED BACKGROUND: Read ed3d-extending-claude:writing-claude-directives for foundational guidance on token efficiency, compliance techniques, and directive structure. This skill focuses on agent-specific patterns.”
- name
- creating-an-agent
- user-invocable
- false
Files
Just SKILL.md in plugins/ed3d-extending-claude/skills/creating-an-agent of ed3dai/ed3d-plugins.
Open the folder on GitHubat commit 0c90f4b
Compare with similar skills
Creating An Agent 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 |
|---|---|---|---|---|---|---|
| Creating An Agent this skilled3dai/ed3d-plugins | 250 | — | ~2k | Automated safety check: Pass | None | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Plugin Settings Patternanthropics/claude-plugins-official | 38k | 7 repos | ~3k | Automated safety check: Pass | Apache-2.0 | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence | |
| Kimi Code DelegationCherryHQ/cherry-studio | 52k | 1 repos | ~504 | Automated safety check: Pass | AGPL-3.0 |
Similar skills
- Official
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Claude Code Agent Development
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
- Official
Plugin Settings Pattern
anthropics/claude-plugins-official
Shows how Claude Code plugins keep per-project settings and state in .claude/plugin-name.local.md files with YAML frontmatter and a markdown body.
Crush Configuration
charmbracelet/crush
Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
Kimi Code Delegation
CherryHQ/cherry-studio
Delegates one bounded repository task to Kimi Code in non-interactive prompt mode and reads back the final result from its JSON event stream.
- Official
Claude Automation Recommender
anthropics/claude-plugins-official
Scans a codebase and suggests which Claude Code hooks, subagents, skills, plugins and MCP servers fit its stack, without changing any files.
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Related
Works with
Categories
Questions about Creating An Agent
What does Creating An Agent do?
A skill your agent uses when creating specialized subagents for Claude Code plugins or the Task tool - covers description writing for auto-delegation, tool selection, prompt structure, and testing…. Creating An Agent is an agent skill from ed3dai/ed3d-plugins.
When should I use Creating An Agent?
Creating An Agent fits situations like: creating specialized subagents for Claude Code plugins; the Task tool - covers description writing for auto-delegation; prompt structure.
How do I install Creating An Agent in Claude Code?
Run `npx skills add ed3dai/ed3d-plugins --skill creating-an-agent -a claude-code`. Or copy the skill folder (plugins/ed3d-extending-claude/skills/creating-an-agent in ed3dai/ed3d-plugins) into .claude/skills/creating-an-agent in your project. Claude Code loads it when a task matches its description.
How do I install Creating An Agent in Codex?
Run `npx skills add ed3dai/ed3d-plugins --skill creating-an-agent -a codex`. Or copy the skill folder (plugins/ed3d-extending-claude/skills/creating-an-agent in ed3dai/ed3d-plugins) into .agents/skills/creating-an-agent in your project. Codex loads it when a task matches its description.
Can I use Creating An Agent 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 ed3dai/ed3d-plugins --skill creating-an-agent -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/creating-an-agent, .gemini/skills/creating-an-agent, .github/skills/creating-an-agent and .opencode/skills/creating-an-agent in your project.
What does Creating An Agent need to run?
SKILL.md names no scripts, command-line tools or credentials: Creating An Agent is instructions for the agent only.
Does Creating An Agent 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 Creating An Agent 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 Creating An Agent use?
No licence was found for Creating An Agent or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Creating An Agent use?
About 2k tokens (SKILL.md is roughly 8.1k 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 Creating An Agent?
Skills that share tags, products or a category with Creating An Agent: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Creating An Agent?
ed3dai (a GitHub organization) maintains it in ed3dai/ed3d-plugins, which has 250 GitHub stars. The repository holds 34 skills in this directory. The repository was last updated on September 6, 2026.
Source: ed3dai/ed3d-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.