skill-creator

skill-creator is a skill for Claude Code, Codex from Lapis0x0/obsidian-yolo. It costs 51 tokens per session (2,338 once invoked), scanned A, original, MIT.

A guide to creating skills, which are reusable instruction files that give an agent specialised knowledge and workflows. It is designed for skills stored in an Obsidian vault, a folder of linked Markdown notes.

In plain words
What is it for?
Use it when creating, reviewing, or improving a YOLO skill for an Obsidian vault. It helps structure the skill and its supporting instructions, but the input does not describe broader development features.
Why use it?
It helps turn scattered expertise into a self-contained guide an agent can follow. It also addresses keeping instructions concise and defining workflows, tools, and quality checks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when creating, reviewing, or improving a YOLO skill for an Obsidian vault. It helps structure the skill and its supporting instructions, but the input does not describe broader development features.

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Install with agentmods
npx agentmods add skills/lapis0x0/obsidian-yolo/skill-creator
About the project

Obsidian YOLO is an AI assistant integrated with Obsidian for chatting, writing, learning, and managing a knowledge base. It is for people who use Obsidian as a workspace for notes and personal knowledge. Catalogue add-ons provide related assistant capabilities.

Lapis0x0/obsidian-yolo · 1,342 stars · on GitHub

Install

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.

Any agent
npx skills add Lapis0x0/obsidian-yolo --skill skill-creator
Clone the repo
git clone --depth 1 https://github.com/Lapis0x0/obsidian-yolo

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for skill-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/lapis0x0/obsidian-yolo/skill-creator/github.svg)](https://agentmods.dev/skills/lapis0x0/obsidian-yolo/skill-creator)
Your own site
<a href="https://agentmods.dev/skills/lapis0x0/obsidian-yolo/skill-creator"><img src="https://agentmods.dev/badge/skills/lapis0x0/obsidian-yolo/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.

agentmods 80×15 button for skill-creator

Your own site · 80×15
<a href="https://agentmods.dev/skills/lapis0x0/obsidian-yolo/skill-creator"><img src="https://agentmods.dev/badge/skills/lapis0x0/obsidian-yolo/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,338 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00051 $0.02338
Opus 5 $0.00026 $0.01169
Sonnet 5 $0.00010 $0.00468
Haiku 4.5 $0.00005 $0.00234

Measured 10d ago against content hash 21047eb1b3f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

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 10d 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.

src/core/skills/builtin/skill-creator/SKILL.md · 256 lines

How it starts

The opening of the file, as written. The whole thing — 256 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

This skill provides guidance for creating effective YOLO skills.

About Skills

Skills are self-contained Markdown files that extend the agent's capabilities by providing specialized knowledge and workflows. Think of them as "onboarding guides" for specific domains or tasks. They transform a general-purpose agent into a specialized one equipped with procedural knowledge that no model can fully possess.

What Skills Provide

  1. Specialized workflows - Multi-step procedures for specific domains
  2. Domain expertise - Company-specific knowledge, schemas, business logic
  3. Tool guidance - Instructions for working with specific file formats or vault structures
  4. Quality standards - Output patterns, naming conventions, and verification checklists

Core Principles

Concise Is Key

The context window is a public good. Skills share the context window with the system prompt, conversation history, other skills metadata, and the actual user request.

Default assumption: the model is already very smart. Only add context the model does not already have. Challenge each piece of information: "Does the model really need this explanation?" and "Does this paragraph justify its token cost?"

Prefer concise examples over verbose explanations.

Set Appropriate Degrees of Freedom

Match the level of specificity to the task's fragility and variability:

  • High freedom (text-based guidance): Use when multiple approaches are valid, decisions depend on context, or heuristics guide the approach.
  • Medium freedom (structured steps with defaults): Use when a preferred pattern exists, some variation is acceptable, or configuration affects behavior.
  • Low freedom (strict sequence, explicit constraints): Use when operations are fragile and error-prone, consistency is critical, or a specific sequence must be followed.

Think of the agent as exploring a path: a narrow bridge with cliffs needs specific guardrails (low freedom), while an open field allows many routes (high freedom).

Read the full file on GitHub · 256 lines

Changes

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.

  1. 10d ago First seen · 256 lines · 51 tokens per session scan A 21047eb1b3f1

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository Lapis0x0/obsidian-yolo (1,342 stars, last pushed today), licensed MIT. It adds 51 tokens to every session and 2,338 once invoked, about $0.0003 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 2026-08-30.

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