challenge SKILL.md skillA
challenge from oliver-kriska/claude-elixir-phoenix is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add oliver-kriska/claude-elixir-phoenix/challenge@git:20260929.c08ad14Pins git:20260929.c08ad14 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- oliver-kriska/claude-elixir-phoenix
- Path
plugins/elixir-phoenix/skills/challenge/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260929.c08ad14, committed Sep 29, 2026
- First version recorded
- Mar 19, 2026
- Size
- 4,849 bytes
- Repository stars
- 569
- License
- MIT
Challenge mode reviews - rigorous questioning before approving changes. Use when you want thorough scrutiny of Ecto changes, LiveView events, OTP designs, or PR readiness.
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
# Challenge Mode Reviews Rigorous, critical review patterns inspired by Boris Cherny's "Grill me" approach. Push beyond first solutions to ensure quality. ## Iron Laws - Never Violate These 1. **No approval without verification** - Don't approve until all concerns addressed 2. **Assume bugs exist** - Look for edge cases, race conditions, missing handlers 3. **Question everything** - Even "obvious" code can hide issues 4. **Demand proof** - Ask for tests, show state transitions, verify behavior ## Adversarial Lenses (Apply to ALL Modes) 1. **"What Would Break This?"** — Production failure modes under load, during deploys, with unexpected data 2. **"Assumption Stress Test"** — List every assumption; which are most fragile? 3. **"Contradictions Finder"** — Find contradictions between tests/implementation, docs/behavior, or within the changeset ## Challenge Modes ### Ecto Challenge (`/phx:challenge ecto`) Grill the developer on database changes: **Migration Safety** - Will this migration lock the table in production? - What happens to existing records without the new field? - Is the migration reversible? - Are there any unsafe operations (column removal, type change)? …
Read the whole file at its exact version.
How to install
mdr add oliver-kriska/claude-elixir-phoenix/challenge@sha256:d9d33c4b43c1b35eThe line at the top of this page pins the label git:20260929.c08ad14, 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_f7xvnb7ziqv37s75)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Mar 19, 2026 and Sep 29, 2026, about one every 39 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260929.c08ad14 latest | 2026-09-29 | c08ad14 | 4,849 B | A | view · diff |
| git:20260724.918f809 | 2026-07-24 | 918f809 | 4,846 B | A | view · diff |
| git:20260508.b30a152 | 2026-05-08 | b30a152 | 4,850 B | A | view · diff |
| git:20260325.d20c8dd | 2026-03-25 | d20c8dd | 4,837 B | A | view · diff |
| git:20260321.4e9d9e9 | 2026-03-21 | 4e9d9e9 | 5,267 B | A | view · diff |
| git:20260319.1bc28c7 | 2026-03-19 | 1bc28c7 | 5,254 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 (4849 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
oliver-kriska/claude-elixir-phoenix · 569 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_f7xvnb7ziqv37s75 GET https://markdownregistry.com/api/v1/resolve?ref=oliver-kriska/claude-elixir-phoenix/challenge GET https://markdownregistry.com/api/v1/blob/d9d33c4b43c1b35e1e245d409dbdfe8f2b4ff9d8f2e7feba07f926a8a5ba8e44
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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