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Challenge Mode Reviews · oliver-kriska | DecimalAI

code reviewby oliver-kriska

Challenge Mode Reviews

oliver-kriska/challenge

Source oliver-kriska/claude-elixir-phoenix ↗License MIT

Challenge mode reviews - rigorous questioning before approving changes.

SkillScore83Maintained

Automatic

Coding pack

Last verified 8/19/2026

What it changes

Passed 18 of 22 test cases with the skill, and 15 of 22 without it.

Without skill70%

With skill83%

Checks it passed that the model alone missed

Demands evidence for failure recovery
Requires supervised tasks or GenServers with timeouts
Requires verifying backward compatibility for active application code

3 fixed16 passed either way4 still failing0 broke

Pass-rate lift: +13 pp
Tokens: +48%
Agent turns: 0%
Response time: -9%

Model gemini-3.6-flashMeasured 8/19/2026v119 of 23 cases passed with skill · 22 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/oliver-kriska-challenge/SKILL.md https://app.decimal.ai/s/oliver-kriska-challenge/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add oliver-kriska-challenge, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/oliver-kriska-challenge/ and pins it in .decimal/skills.lock

decimalai skills add oliver-kriska-challenge

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/oliver-kriska-challenge/SKILL.md https://app.decimal.ai/s/oliver-kriska-challenge/SKILL.md

Raw file: /s/oliver-kriska-challenge/SKILL.md ↗ · machine-readable summary at /s/oliver-kriska-challenge.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 3

Prompt

We are removing the legacy_code column from the users table in our Phoenix application schema and migration. The team plans to deploy the database migration right before rolling out the app updates. Review this deployment order. Output contract: review findings.

What was checked, without and with the skill
Checked	Without skill	With skill
Highlights breaking changes during rolling deployments when old code runs against new schema	Passed	Passed
Requires verifying backward compatibility for active application code	Missed	Passed

case-06 · gemini-3.6-flash · 8/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md142 linessingle file

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

No approval without verification - Don't approve until all concerns addressed
Assume bugs exist - Look for edge cases, race conditions, missing handlers
Question everything - Even "obvious" code can hide issues
Demand proof - Ask for tests, show state transitions, verify behavior

Adversarial Lenses (Apply to ALL Modes)

"What Would Break This?" — Production failure modes under load, during deploys, with unexpected data
"Assumption Stress Test" — List every assumption; which are most fragile?
"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)?

Query Performance

Have you introduced any N+1 queries?
Are there missing indexes for new WHERE clauses?
Will this query scale with data growth?

Schema Integrity

Are all constraints enforced at database level?
What happens during rolling deployment (old code, new schema)?

Track record

Benchmark

18 / 22

test cases passed, vs 15 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

oliver-kriska / claude-elixir-phoenix

plugins/elixir-phoenix/skills/challenge/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

oliver-kriska/phx-challengeChallenge mode reviews - rigorous questioning before approving changes. Use when you want thorough scrutiny of Ecto changes, LiveView events, OTP designs, or PR readiness.Near-identical description+50 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Challenge Mode Reviews

Iron Laws - Never Violate These

Adversarial Lenses (Apply to ALL Modes)

Challenge Modes

Ecto Challenge (/phx:challenge ecto)

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills

Ecto Challenge (`/phx:challenge ecto`)