no-vibe-challenge

no-vibe-challenge is a skill for Claude Code from rizukirr/no-vibe. It costs 40 tokens per session (419 once invoked), scanned A, original, MIT.

A coding exercise generator that creates a challenge from the current project or learning session. The learner writes the code, while the assistant provides constraints, hints, and review.

In plain words
What is it for?
Use it for practice on a project or topic such as error handling or recursion, with challenges adapted to an active learning session when one exists.
Why use it?
It provides focused practice without having the AI complete the implementation, helping the learner apply what they are studying.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the no-vibe plugin — 3 skills, 3 commands, 2 hooks shipped together

Good fit Use it for practice on a project or topic such as error handling or recursion, with challenges adapted to an active learning session when one exists.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/rizukirr/no-vibe/no-vibe-challenge
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 rizukirr/no-vibe --skill no-vibe-challenge
Clone the repo
git clone --depth 1 https://github.com/rizukirr/no-vibe

Made for: Claude Code.

Or install no-vibe, the plugin that ships this one along with the rest of its 3 skills, 3 commands, 2 hooks.

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 no-vibe-challenge

README.md
[![agentmods](https://agentmods.dev/badge/skills/rizukirr/no-vibe/no-vibe-challenge/github.svg)](https://agentmods.dev/skills/rizukirr/no-vibe/no-vibe-challenge)
Your own site
<a href="https://agentmods.dev/skills/rizukirr/no-vibe/no-vibe-challenge"><img src="https://agentmods.dev/badge/skills/rizukirr/no-vibe/no-vibe-challenge/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 no-vibe-challenge

Your own site · 80×15
<a href="https://agentmods.dev/skills/rizukirr/no-vibe/no-vibe-challenge"><img src="https://agentmods.dev/badge/skills/rizukirr/no-vibe/no-vibe-challenge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 419 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.
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 $0.00040 $0.00419
Opus 5.5 $0.00016 $0.00168
Sonnet 5.5 $0.00008 $0.00084
Haiku 4.5 $0.00004 $0.00042

Measured 6d ago against content hash 78bb9fa1fe26, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

no-vibe-challenge 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 6d 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.

skills/no-vibe-challenge/SKILL.md · 55 lines

What it actually says

no-vibe-challenge

Give the user one hands-on challenge. The user writes every line.

1. Turn on the guard

Remember whether .no-vibe/active exists, then run:

mkdir -p .no-vibe && touch .no-vibe/active

2. Pick the challenge

  • If .no-vibe/syllabus.md exists, build the challenge from sections already ticked, at its level, explained in its teaching style.
  • Otherwise look at the project to infer the stack and pick something relevant to it.
  • If .no-vibe/project.md exists, use its stack and versions. The challenge stays a separate exercise outside the project.
  • A focus argument narrows the topic.

3. Present it

Challenge: {title}

{1 to 3 sentences}

Done when:

  • {observable criterion}
  • {observable criterion}

Run: {exact command}

Ask for a hint anytime, or say review when you are done.

  • Show no solution code.
  • Every criterion is something the user can run and observe.
  • The scope fits 5 to 20 minutes.
  • A hint narrows the problem without giving code.
  • Review only when asked: read the user's code and give short feedback anchored to lines.

4. Finish

If .no-vibe/active did not exist before step 1, run rm -f .no-vibe/active.

Hard rules

  • Never write to project files. While active, .no-vibe/** is the only write-allowed area.
  • Keep the scope to 5 to 20 minutes.
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. 6d ago Changed · -59 lines · +2 tokens per session 78bb9fa1fe26
  2. 1mo ago First seen · 114 lines · 38 tokens per session scan A 21f5d41efc86

Subscribe to this mod's changes

no-vibe-challenge is a skill published in the GitHub repository rizukirr/no-vibe (44 stars, last pushed 6d ago), licensed MIT. It adds 40 tokens to every session and 419 once invoked, about $0.0002 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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