Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ashaykubal/essential-agents-skills --skill create-subagentgit clone --depth 1 https://github.com/ashaykubal/essential-agents-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ashaykubal/essential-agents-skills/create-subagent)<a href="https://agentmods.dev/skills/ashaykubal/essential-agents-skills/create-subagent"><img src="https://agentmods.dev/badge/skills/ashaykubal/essential-agents-skills/create-subagent/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ashaykubal/essential-agents-skills/create-subagent"><img src="https://agentmods.dev/badge/skills/ashaykubal/essential-agents-skills/create-subagent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00042 | $0.04644 |
| Opus 5 | $0.00021 | $0.02322 |
| Sonnet 5 | $0.00008 | $0.00929 |
| Haiku 4.5 | $0.00004 | $0.00464 |
Grade A, and why
create-subagent scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
98% identical to create-subagent — 715 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 354 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Sub-Agent
Generates a complete single-purpose Claude Code sub-agent from a description or requirements document. Conducts an adaptive interview to understand the agent's identity and mission, determines tool permissions and supporting configuration, spawns a Sonnet sub-agent to generate the agent file, validates with anthropic-validator, and presents the scaffold with architectural decisions.
Sub-agents are invoked via Task(subagent_type=...) and run in a forked context. They perform a single focused task and return results. They cannot spawn other sub-agents — pipeline orchestration belongs in skills, not agents.
When to Use This Skill
Load this skill when the user request matches ANY of these patterns:
| Trigger Pattern | Example User Request |
|---|---|
| Sub-agent creation | "Create a sub-agent for X", "Make an agent for X" |
| Agent scaffolding | "Scaffold an agent", "Set up a new agent" |
| Agent generation | "Generate an agent that does X" |
| Dedicated worker | "Create a dedicated agent for this sub-agent role" |
| Task tool agent | "I need an agent I can invoke via Task tool" |
DO NOT use for:
- Creating pipeline orchestration (use
create-skill— it generates the orchestrating skill + sub-agent files) - Creating Agent Teams leads (use
create-skillwith the research template) - Creating skills (use
create-skill) - Editing existing agents (edit directly)
- Debugging agent issues (use
issue-debugging) - Validating existing agents (use
anthropic-validator)
Dependencies
| Category | Files | Requirement | When to Load |
|---|---|---|---|
| Decision framework | references/decision-framework.md |
REQUIRED | Load at Stage 0 for interview + classification |
| Agent conventions | references/agent-conventions.md |
REQUIRED | Include in Stage 2 generator prompt |
| Content guidance | references/content-guidance.md |
REQUIRED | Include in Stage 2 generator prompt |
| Agent template | references/template-single-agent.md |
REQUIRED | Load at Stage 2 |
| Diagnostic template | templates/diagnostic-output.yaml |
REQUIRED | Use at Stage 6 |
| Subagent prompting | subagent-prompting skill |
REQUIRED | Load at Stage 0 for 4-part prompt template |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 354 lines · 42 tokens per session scan A 017fa48e347d
create-subagent is a skill published in the GitHub repository ashaykubal/essential-agents-skills (2 stars, last pushed 1mo ago), licensed MIT. It adds 42 tokens to every session and 4,644 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to create-subagent, differing in 715 lines, and is treated as a copy.
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