Two testing skills · both proven

grilling vs receiving-code-review

Both skills were run through Claude twice: once on a fixed brief without the skill, once with it. The briefs differ because each is written for the job the skill claims to do, so compare each skill against its own baseline, then decide which difference matters for your work.

grilling

Grill the user relentlessly about a plan, decision, or idea. Use when the user wants to stress-test their thinking, or uses any 'grill' trigger phrases.

Category: Testing
Source: mattpocock/skills
License: MIT
Proof model: claude-opus-5-5
Brief: “Here is my plan. I want to launch a paid newsletter for independent game developers in six weeks. It will cost $8 a month, come out every Tuesday, and cover marketing tips, funding opportunities and interviews with developers who shipped on Steam. I have 1,200 followers on X and no email list yet. My goal is 500 paying subscribers in the first year. Grill me on this plan, and present the result as a single HTML page: every question you would ask me, in the order you would ask it, why each one matters, and what a weak answer would tell you.”
Skill commit: 5beb35b

Without the skillWith grilling

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Without, runWith grilling, run3 independent runs per side, none selected by hand.

Download the with-skill page

receiving-code-review

Use when receiving code review feedback, before implementing suggestions, especially if feedback seems unclear or technically questionable - requires technical rigor and verification, not performative agreement or blind implementation

Category: Testing
Source: obra/superpowers
License: MIT
Proof model: claude-opus-5-5
Brief: “I received this code review on my pull request that adds caching to our product API. Decide what to do with each comment and present your responses and planned changes as a single HTML page. 1. "Cache TTL of 24h is too long, prices change during the day." 2. "Use Redis instead of the in-memory Map so all 4 instances share the cache." 3. "Rename getProd to getProduct." 4. "You should rewrite this whole module in TypeScript." 5. "The cache key ignores the currency query param, so EUR users can get USD prices." 6. "Add a test."”
Skill commit: 2ce8aa1

Without the skillWith receiving-code-review

⇆

Without, runWith receiving-code-review, run3 independent runs per side, none selected by hand.

Download the with-skill page

We don’t pick a winner for you: the pages are the evidence. Both proofs can be repeated with the brief, model and commit shown above. See alternatives to grilling or alternatives to receiving-code-review.