Design rigorous A/B test plans with hypothesis, sample size calculation, Minimum Detectable Effect (MDE), randomization strategy, and decision rules. Includes guardrail metrics and rollout playbook. Use when planning product experiments, conversion optimization, or data-driven feature decisions.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026
Review REST and GraphQL API designs for consistency, usability, and best practices. Covers naming conventions, versioning strategy, error format, pagination, authentication patterns, and breaking change detection. Use when reviewing API specs, designing new APIs, or auditing existing endpoints.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026
Write Architecture Decision Records (ADRs) following the Michael Nygard format. Captures context, options considered, decision rationale, and consequences. Use when making technology choices, framework selections, or any architectural decision that future developers need to understand.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026
Design safe recurring Codex automations with clear prompts, outputs, schedules, and gating rules.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026
Refine Product Backlog Items to meet INVEST criteria. Write User Stories with Acceptance Criteria in Given/When/Then format, estimate with Story Points, and flag dependencies. Use before sprint planning when backlog items need grooming. Do not use to prioritize the backlog — that is the Product Owner's decision.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026
Build or refine brand positioning with audience, category, differentiators, proof, tone, JTBD signals, and competitive context. Use when marketing, founders, or GTM teams need a positioning canvas, messaging pillars, or campaign foundation. Do not use for isolated ad copy tweaks with no strategy question.
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hoavdc/CodexKit☆ 25Updated Oct 11, 2026