Borrowing it
Nothing to install: this file belongs to kivo360/OmoiOS. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kivo360/OmoiOS/main/.claude/skills/skill-creator/SKILL.mdgit clone --depth 1 https://github.com/kivo360/OmoiOSWrote 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/kivo360/omoios/skill-creator)<a href="https://agentmods.dev/skills/kivo360/omoios/skill-creator"><img src="https://agentmods.dev/badge/skills/kivo360/omoios/skill-creator.svg" alt="Measured on agentmods" 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 | $0.00045 | $0.03674 |
| Opus 5 | $0.00023 | $0.01837 |
| Sonnet 5 | $0.00009 | $0.00735 |
| Haiku 4.5 | $0.00005 | $0.00367 |
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 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.
This is a copy
88% identical to skill-creator — 84 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 — 357 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 skills.
About Skills
Skills are modular, self-contained packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific domains or tasks—they transform Claude from a general-purpose agent into a specialized agent equipped with procedural knowledge that no model can fully possess.
What Skills Provide
- Specialized workflows - Multi-step procedures for specific domains
- Tool integrations - Instructions for working with specific file formats or APIs
- Domain expertise - Company-specific knowledge, schemas, business logic
- Bundled resources - Scripts, references, and assets for complex and repetitive tasks
Core Principles
Concise is Key
The context window is a public good. Skills share the context window with everything else Claude needs: system prompt, conversation history, other Skills' metadata, and the actual user request.
Default assumption: Claude is already very smart. Only add context Claude doesn't already have. Challenge each piece of information: "Does Claude 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 instructions): Use when multiple approaches are valid, decisions depend on context, or heuristics guide the approach.
Medium freedom (pseudocode or scripts with parameters): Use when a preferred pattern exists, some variation is acceptable, or configuration affects behavior.
Low freedom (specific scripts, few parameters): Use when operations are fragile and error-prone, consistency is critical, or a specific sequence must be followed.
Think of Claude as exploring a path: a narrow bridge with cliffs needs specific guardrails (low freedom), while an open field allows many routes (high freedom).
What ships with it
6 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.
- 8d ago First seen · 357 lines · 45 tokens per session scan A b2e3d83f6042
skill-creator is a skill published in the GitHub repository kivo360/OmoiOS (77 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 45 tokens to every session and 3,674 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to skill-creator, differing in 84 lines, and is treated as a copy.
Other skills, from other repositories
self-awareness
Use when the user asks about Archie itself — what Archie is, how it works, what it can or cannot do, what agents or domains exist, how plugins work, how requests get handled, why something behaves a certain way, what integrations are available, or whether Archie can change itself. Triggers on phrases like "what can…
writing-plugins
Read this before authoring or substantially changing a plugin, agent, or skill for Archie. It's the conceptual playbook for building plugins that fit Archie's multi-agent, single-orchestrator model — what a plugin must respect, why every plugin usually needs an orchestrator-facing skill, and how to think about agents…
triggers
Set up, list, or manage triggers — persistent "do Y when X happens" rules. Use when someone asks Archie to do something on a schedule ("every weekday at 9am…", "every morning post…", "remind the channel weekly…"), to react to new messages in a channel ("whenever someone posts X in.
thread-conduct
Use before posting anywhere outside this task's own thread, or when deciding how much to post inside it. Covers keeping one task in one thread, what to do with a finding that belongs to another team, when a cross-channel post is allowed and how small it must be, how much traffic a thread should carry, and how to…
trigger-task
Use when this task was started by a trigger and you have been given a trigger directory — the one place that survives from one fire of that trigger to the next. Covers reading what an earlier fire left before you start work, what is worth leaving behind so a later fire continues instead of repeating, keeping the…
engineering-pr
Pull request lifecycle management. Use when you need to create a PR, handle PR reviews, resolve merge conflicts, or manage the PR-to-merge workflow. Extends the engineering skill with GitHub-specific tools and decision framework.