challenging SKILL.md skillA
challenging from oaustegard/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add oaustegard/claude-skills/challenging@v0.13.0Pins v0.13.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- oaustegard/claude-skills
- Path
challenging/SKILL.md- Versions recorded
- 6
- Latest version
- v0.13.0, committed Oct 7, 2026
- First version recorded
- Apr 18, 2026
- Size
- 13,679 bytes
- Repository stars
- 158
- License
- MIT
Cross-context adversarial review for deliverables before shipping. Use when producing blog posts, technical recommendations, analysis briefs, code, or any artifact where accuracy matters more than speed. Triggers on "challenge this", "review before shipping", "adversarial pass", "stress test this".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Challenging — Adversarial Review Adversarial review before shipping. Three paths, each with distinct trade-offs: - **Subagent path** (Claude Code, primary). Native sub-Claude via the Task tool — zero API keys, fresh context window, same model. Best when available. - **External API path** (claude.ai, Codex, headless). Gemini (cross-model + cross-context) or Anthropic API (cross-context). Costs an incremental API call but gives genuine outside perspective. - **Self path** (any environment). The caller assistant inhabits the adversary persona in a dedicated response. Zero cost, retains full subject-matter context from the conversation. Weaker at catching same-session confabulations than fresh-context adversaries, stronger at catching local-convention and factual errors the artifact glosses over. Not a strict downgrade — a different failure-mode profile. The `adversary='auto'` resolution (default) picks gemini → claude → self based on available credentials. Callers in Claude Code still use `prepare()` + Task tool explicitly (subagent is strictly better than self in that environment, and auto-detection of Claude Code is brittle). …
Read the whole file at its exact version.
How to install
mdr add oaustegard/claude-skills/challenging@sha256:1da5e72a09afcbf5The line at the top of this page pins the label v0.13.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_63qovn2qks4cc4dt)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Apr 18, 2026 and Oct 7, 2026, about one every 34 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.13.0 latest | 2026-10-07 | d854510 | 13,679 B | A | view · diff |
| v0.12.0 | 2026-09-03 | 8823a92 | 13,679 B | A | view · diff |
| v0.11.0 | 2026-07-02 | e94a854 | 13,531 B | A | view · diff |
| v0.10.0 | 2026-05-13 | 9c4932e | 12,994 B | A | view · diff |
| v0.9.0 | 2026-04-18 | 4793204 | 10,897 B | A | view · diff |
| v0.8.2 | 2026-04-18 | 848ca46 | 7,873 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13679 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
oaustegard/claude-skills · 158 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_63qovn2qks4cc4dt GET https://markdownregistry.com/api/v1/resolve?ref=oaustegard/claude-skills/challenging GET https://markdownregistry.com/api/v1/blob/1da5e72a09afcbf55d04911d5f4fca8d52b52a9ecf68eac384832f81dfa13fc5
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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