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 lvndry/jazz --skill skill-creatorgit clone --depth 1 https://github.com/lvndry/jazzWrote 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/lvndry/jazz/skill-creator)<a href="https://agentmods.dev/skills/lvndry/jazz/skill-creator"><img src="https://agentmods.dev/badge/skills/lvndry/jazz/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/lvndry/jazz/skill-creator"><img src="https://agentmods.dev/badge/skills/lvndry/jazz/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
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 →
- high Rogue Agent · line 203 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Rogue Agent · line 3 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00035 | $0.01643 |
| Opus 5.5 | $0.00014 | $0.00657 |
| Sonnet 5.5 | $0.00007 | $0.00329 |
| Haiku 4.5 | $0.00003 | $0.00164 |
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 today.
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 — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Create effective Jazz skills for automating workflows and specialized tasks.
Gathering Information (Questionnaire)
Do not create the skill until you have enough information. If the user's request is vague (e.g. "create a skill", "I want a skill for X") or missing any of the items below, guide them through a short questionnaire instead of guessing.
You have enough info when you know:
- Purpose: What specific task or workflow should this skill automate?
- Location: Global (
~/.jazz/skills/,~/.agents/skills) or project-specific (./skills/)? - Triggers: When should Jazz automatically apply this skill? (Trigger phrases or scenarios.)
- Domain knowledge: What specialized information is needed?
- Output format: Are there specific templates or formats required?
How to run the questionnaire:
- Ask one or a few questions at a time; don't dump a long list.
- If the user gave partial context, infer what you can and ask only for what's missing.
- After each answer, confirm what you have and ask only what's still missing.
- Once you have all five items above, proceed to create the skill (directory + SKILL.md and any supporting files).
Skill Structure
skill-name/
├── SKILL.md # Required - main instructions
├── reference.md # Optional - detailed documentation
├── examples.md # Optional - usage examples
└── scripts/ # Optional - utility scripts
Storage Locations
| Type | Path | Scope |
|---|---|---|
| Global | ~/.jazz/skills/skill-name/ |
Available in all projects |
| Project | ./skills/skill-name/ |
Project-specific |
| Built-in | Ships with Jazz | Cannot be modified |
SKILL.md Format
Every skill requires a SKILL.md with YAML frontmatter:
---
name: your-skill-name
description: Brief description of what this skill does and when to use it
---
# Your Skill Name
## Instructions
Clear, step-by-step guidance.
## Examples
Concrete usage examples.
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.
- today Changed · +8 lines 94e51dd6302d
- 1mo ago First seen · 258 lines · 35 tokens per session scan A f2bd1a715f50
skill-creator is a skill published in the GitHub repository lvndry/jazz (54 stars, last pushed yesterday), licensed MIT. It adds 35 tokens to every session and 1,643 once invoked, about $0.0001 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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knowledge-session-state-and-context-session-catalog-fork-rewind-and-export
A session-lifecycle component for finding, resuming, archiving, branching, rewinding, searching, and exporting saved conversations.