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 WellApp-ai/Well --skill skill-creatorgit clone --depth 1 https://github.com/WellApp-ai/WellWrote 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/wellapp-ai/well/skill-creator)<a href="https://agentmods.dev/skills/wellapp-ai/well/skill-creator"><img src="https://agentmods.dev/badge/skills/wellapp-ai/well/skill-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/wellapp-ai/well/skill-creator"><img src="https://agentmods.dev/badge/skills/wellapp-ai/well/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00011 | $0.00445 |
| Opus 5.5 | $0.00004 | $0.00178 |
| Sonnet 5.5 | $0.00002 | $0.00089 |
| Haiku 4.5 | $0.00001 | $0.00044 |
Grade A, and why
skill-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 1mo 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.
What it actually says
Skill Creator
Use this skill to create new skills.
SKILL.md Template
---
name: your-skill-name
description: When to use this skill
---
# Skill Name
Brief description of what this skill does.
## When to Use
- Situation 1
- Situation 2
## Instructions
Step-by-step guide Claude follows.
## Examples
Concrete usage examples.
## Guidelines
- Best practice 1
- Best practice 2
Skill vs Mode Decision
| Create a... | When... |
|---|---|
| Mode | Triggered by user intent (workflow) |
| Skill | Invoked explicitly for capability |
Examples:
- "init feature" → Mode (workflow triggered by intent)
- "use webapp-testing" → Skill (capability invoked explicitly)
File Location
- Modes:
.cursor/rules/modes/<name>.mdc - Skills:
.cursor/rules/skills/<name>/SKILL.md
Naming Conventions
- Use lowercase with hyphens:
my-skill-name - Be descriptive:
webapp-testingnottest - Match the folder name to the skill name
Required Sections
- YAML Frontmatter - name and description
- Title - Clear skill name
- When to Use - Trigger conditions
- Instructions - What Claude should do
- Examples - Concrete usage
Optional Sections
- Guidelines / Best Practices
- Common Issues / Troubleshooting
- Related Skills / Modes
After Creating
- Test the skill with explicit invocation: "use [skill-name] skill"
- Document in team wiki if shared
- Consider adding to Mode Detection if workflow-based
Existing Skills
| Skill | Purpose |
|---|---|
mcp-server |
Create MCP integrations |
webapp-testing |
Browser/Storybook testing |
skill-creator |
Create new skills (this one) |
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.
- 1mo ago First seen · 86 lines · 11 tokens per session scan A 5ed58945840e
skill-creator is a skill published in the GitHub repository WellApp-ai/Well (345 stars, last pushed 6d ago), licensed MIT. It adds 11 tokens to every session and 445 once invoked, about $0.0000 per session on Opus 5.5. 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 2026-08-30.
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