Subagent Creator

What it does

When your agent uses it

• Users ask to create a new sub-agent
• Specialized assistant
• Want to configure task-specific AI workflows for Claude Code

Example prompts

• “/subagent-creator”

Workflow steps

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

1. 1Gather requirements: Ask about the sub-agent's purpose, when to use it, and required capabilities
2. 2Choose scope: Project (.claude/agents/) or user (~/.claude/agents/)
3. 3Define configuration: Name, description, tools, model
4. 4Write system prompt: Clear role, responsibilities, and output format
5. 5Create file: Write the .md file to the appropriate location

What it can do on your machine

Read from SKILL.md and the folder at commit 172bdd4. 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, yaml and bash).

  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

Subagent Creator loads about 958 tokens when it runs, and up to ~2.7k if it reads all its reference files. Until then it costs about 65 tokens; SKILL.md has 263 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~65

When it runs · the whole SKILL.md, loaded when a task matches

~958

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.7k

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

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 greatSumini/cc-system at commit 172bdd4, republished under its MIT licence (© greatSumini). 263 words, ~958 tokens.

name

subagent-creator

description

Create specialized Claude Code sub-agents with custom system prompts and tool configurations. Use when users ask to create a new sub-agent, custom agent, specialized assistant, or want to configure task-specific AI workflows for Claude Code.

---
name: subagent-name
description: When to use this subagent (include "use proactively" for auto-delegation)
tools: Tool1, Tool2, Tool3  # Optional - inherits all if omitted
model: sonnet               # Optional - sonnet/opus/haiku/inherit
permissionMode: default     # Optional - default/acceptEdits/bypassPermissions/plan
skills: skill1, skill2      # Optional - auto-load skills
---

System prompt goes here. Define role, responsibilities, and behavior.

# Good - specific triggers
description: Expert code reviewer. Use PROACTIVELY after writing or modifying code.

# Good - clear use cases
description: Debugging specialist for errors, test failures, and unexpected behavior.

# Bad - too vague
description: Helps with code

mkdir -p .claude/agents

---
name: code-reviewer
description: Reviews code for quality and security. Use proactively after code changes.
tools: Read, Grep, Glob, Bash
model: inherit
---

You are a senior code reviewer.

When invoked:
1. Run git diff to see changes
2. Review modified files
3. Report issues by priority

Focus on:
- Code readability
- Security vulnerabilities
- Error handling
- Best practices

© greatSumini, 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, assets) in .claude/skills/subagent-creator of greatSumini/cc-system.

• SKILL.md
• assets/subagent-template.md
• references/available-tools.md
• references/examples.md

Open the folder on GitHubat commit 172bdd4