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 curiositech/some_claude_skills --skill skillful-subagent-creatorgit clone --depth 1 https://github.com/curiositech/some_claude_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/curiositech/some_claude_skills/skillful-subagent-creator)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/skillful-subagent-creator"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/skillful-subagent-creator/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/curiositech/some_claude_skills/skillful-subagent-creator"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/skillful-subagent-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 178 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- low Excessive Agency · line 360 Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
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 | $0.00112 | $0.02959 |
| Opus 5 | $0.00056 | $0.01479 |
| Sonnet 5 | $0.00022 | $0.00592 |
| Haiku 4.5 | $0.00011 | $0.00296 |
Grade A, and why
skillful-subagent-creator 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 363 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skillful Subagent Creator
Creates Claude subagents that are equipped with curated skills as their standard operating procedures. Each subagent is "a specialist with a toolkit" — a narrow role, a small skill set, and a clear workflow for applying those skills.
When to Use
✅ Use for:
- Designing a specialist subagent for a specific domain
- Selecting which skills to attach to a subagent (2-5 core skills)
- Writing the 4-section subagent prompt (Identity, Skills, Task Loop, Constraints)
- Wiring subagents into DAG orchestration workflows
- Defining input/output contracts between DAG nodes
❌ NOT for:
- Creating the skills themselves (use
skill-architect) - Single-agent prompting without skills
- General Claude Code features or MCP setup
Subagent Creation Process
flowchart TD
A[Define the role] --> B[Select 2-5 skills]
B --> C[Write 4-section prompt]
C --> D[Define input/output contracts]
D --> E[Choose DAG position]
E --> F{Standalone or chained?}
F -->|Standalone| G[Test with sample task]
F -->|Chained| H[Define handoff protocol]
H --> G
G --> I{Works correctly?}
I -->|No| C
I -->|Yes| J[Deploy]
Step 1: Define the Role
A subagent's role must be narrow enough to be expert, broad enough to be useful.
flowchart TD
A{How narrow?} -->|Too broad| B["Do all marketing" ❌]
A -->|Right| C["Draft landing page copy" ✅]
A -->|Too narrow| D["Fix typos in H1 tags" ❌]
Test: Can you describe what this subagent does in one sentence with a specific verb and noun? If not, narrow it.
Examples of well-scoped roles:
| Role | Domain | Sentence |
|---|---|---|
| Refactorer | TypeScript | "Designs and executes safe refactors in TypeScript monorepos" |
| PR Reviewer | Code review | "Reviews pull request diffs for correctness, style, and security" |
| Research Synthesizer | Research | "Synthesizes multi-source research into cited briefing documents" |
| Migration Planner | Databases | "Plans database schema migrations with rollback strategies" |
What ships with it
1 file 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.
- 8d ago First seen · 363 lines · 112 tokens per session scan A b572151b57e9
skillful-subagent-creator is a skill published in the GitHub repository curiositech/some_claude_skills (221 stars, last pushed 5d ago), licensed MIT. It adds 112 tokens to every session and 2,959 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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