challenge

challenge is a skill for Claude Code, Codex from xDido/chiron. It costs 43 tokens per session (8,311 once invoked), scanned D, original, MIT.

A coding practice tool that turns patterns from a source file into short exercises. It grades answers out of 10 and records results in a user profile file.

In plain words
What is it for?
Use it to create drills from a project file, target patterns found in that file, review imports and conventions when project context exists, and track scores.
Why use it?
It helps developers practise concepts from their own code instead of studying unrelated examples.

Skill for Claude CodeCodex

Part of the chiron plugin — 11 skills shipped together

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.

agentmods
npx agentmods add skills/xdido/chiron/challenge
Any agent
npx skills add xDido/chiron --skill challenge
Clone the repo
git clone --depth 1 https://github.com/xDido/chiron

Made for: Claude Code, Codex.

Or install chiron, the plugin that ships this one along with the rest of its 11 skills.

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 challenge

README.md
[![agentmods](https://agentmods.dev/badge/skills/xdido/chiron/challenge.svg)](https://agentmods.dev/skills/xdido/chiron/challenge)
Your own site
<a href="https://agentmods.dev/skills/xdido/chiron/challenge"><img src="https://agentmods.dev/badge/skills/xdido/chiron/challenge.svg" alt="Measured on agentmods" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,311 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 2 findings. Scan, not verified.
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 $0.00043 $0.08311
Opus 5 $0.00022 $0.04156
Sonnet 5 $0.00009 $0.01662
Haiku 4.5 $0.00004 $0.00831

Measured 5d ago against content hash 7e2e4c6e0983, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

challenge scanned grade D with 2 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 5d 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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

The bias is a **preference, not a requirement**. If the user explicitly requests a specific pattern (*"drill me on X"*), honor it regardless of mastery status — anti-pattern #2 (never refuse) applies here.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

1. **Do not moralize.** No "you should have", no guilt. Grades are feedback, not judgment.
.agents/skills/challenge/SKILL.md · 489 lines

How it starts

The opening of the file, as written. The whole thing — 489 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/challenge — hero feature: drills from your own code

Step 0 — Load project context

Check if .chiron-context.md exists in the project root.

If it exists: Read it. This file is your complete project reference. DO NOT scan the codebase, list directories, or re-read config files. The only additional file you read is the target source file from Step 1. Proceed to Step 1.

If it does NOT exist: Tell the user: "No project context found. Run /teach-chiron first." Then stop.

┌──────────────────────────────────────────────┐
│  /challenge                                  │
├──────────────────────────────────────────────┤
│  REQUIRES .chiron-context.md                 │
│  Run /teach-chiron once to generate it       │
├──────────────────────────────────────────────┤
│  CORE (always active)                        │
│  ✓ Language pack seeded pattern matching     │
│  ✓ Eyeball fallback for unmatched files      │
│  ✓ /10 grading + profile logging             │
├──────────────────────────────────────────────┤
│  ENHANCED (with rich project context)        │
│  + Project-aware drill targeting             │
│  + Concept pack auto-detection from imports  │
│  + Convention-aligned grading feedback        │
└──────────────────────────────────────────────┘

/challenge reads a source file, finds 1–3 concrete practice targets grounded in specific lines, and presents them as short drills you can complete in 5–15 minutes. Each drill is tied to an idiom from the language pack. Your attempts get graded /10 with honest, specific feedback.

Usage

  • /challenge — drill on the current file in focus
  • /challenge path/to/file.go — drill on a specific file
  • /challenge functionName — locate the named function in the current file and drill on it

The arguments

$ARGUMENTS

CRITICAL — user instructions always win

Before anything else, check .agents/README.md. If user instructions conflict with this command's behavior — e.g., "just fix my code directly, don't drill me" — follow the user. Switch to a direct fix-and-explain mode, skip drill generation, and don't write to the profile file.

Read the full file on GitHub · 489 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. 5d ago First seen · 489 lines · 43 tokens per session scan D 7e2e4c6e0983

Subscribe to this mod's changes

challenge is a skill published in the GitHub repository xDido/chiron (2 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 8,311 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it D with 2 findings (tells the agent never to refuse, strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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