Rules and guidelines for working with Spring Data JPA in the project. ALWAYS use this skill when adding, removing, or modifying JPA entities, repositories, or projections. Trigger on any request that involves changing entity structure, adding new entities, modifying field annotations, updating database mappings, creating or modifying Spring Data repositories, or defining query projections (interfaces, DTOs).

Three.js materials - PBR, basic, phong, shader materials, material properties. Use when styling meshes, working with textures, creating custom shaders, or optimizing material performance.

Three.js lighting - light types, shadows, environment lighting. Use when adding lights, configuring shadows, setting up IBL, or optimizing lighting performance.

Show MemPalace status — room counts, storage usage, and palace health.

This skill should be used when the user says "style explore", "arn style", "visual style", "explore styles", "UI style", "look and feel", "design direction", "pick a style", "choose colors", "theme the app", "visual direction", "style guide", or wants to explore and define the visual design direction for their project through guided conversation, producing a style brief document with implementable toolkit configuration.

This skill should be used when the user says "swift", "arness code swift", "quick change", "small change", "just do this", "quick feature", "quick implementation", "swift fix", "implement this quickly", "add this quickly", "simple change", "just implement this", "arn-code-swift", "swift mode", "quick task", or wants a lightweight, pattern-aware implementation for a small feature or enhancement (1-8 files) without going through the full Arness pipeline. Bridges the gap between raw Claude Code and the full feature-spec/plan pipeline. Includes architectural assessment, targeted testing, and pattern compliance review.

This skill should be used when the user says "catch up", "catch-up", "arness code catch up", "retroactive docs", "document old commits", "backfill artifacts", "what did I miss", "undocumented commits", "catch up on commits", "document past work", "backfill records", or wants to retroactively document commits that were made outside the Arness pipeline.

This skill should be used when the user says "spark help", "arn spark help", "greenfield status", "greenfield help", "where am I in spark", "what's next for spark", "spark pipeline", "spark status", "arn-spark-help", "show spark pipeline", "what step am I on for spark", "spark workflow", "exploration status", "show exploration pipeline", "how does spark work", "explain spark pipeline", or wants to see their current position in the Arness Spark exploration pipeline and get guidance on the next step.

Optional customization tool for infrastructure projects. This skill should be used when the user says "infra init", "arn infra init", "initialize infra", "setup infrastructure", "arn-infra-init", "configure infra", "init infra", "infrastructure setup", "set up infrastructure", "infra setup", "start infra", "configure arn infra", "add infrastructure to this project", "review infra config", "customize infra config", "infra settings", or wants to configure providers, environments, IaC tools, CI/CD platform, or review current infrastructure settings. Arness Infra auto-configures with sensible defaults on first skill invocation — this init is optional for basic usage but required for provider/environment configuration.

This skill should be used when the user says "arness code assess", "arn-code-assess", "assess codebase", "technical review", "codebase assessment", "find improvements", "what should I improve", "tech debt review", "tech debt audit", "pattern compliance check", "codebase health check", "assess the project", "improvement plan", "review my codebase", "what needs fixing", "code quality check", "audit my code", "run an assessment", or wants a comprehensive technical assessment of the codebase against stored patterns followed by prioritized improvement execution through the full Arness pipeline.

This skill should be used when the user says "standard", "standard mode", "standard implementation", "arn-code-standard", "standard change", "medium change", "standard feature", "standard fix", or wants a mid-ceremony implementation for a change that needs lightweight architectural context (spec-lite) and task-tracked execution but not the full feature-spec/plan pipeline. Bridges the gap between arn-code-swift and the full thorough pipeline. Includes spec-lite generation, structured plan, in-session execution, review-lite, and a unified change record.

This skill should be used when the user says "execute task N", "run task N", "implement task N", "re-run task N", "retry task N", "run single task", or wants to execute a single specific task from the task list with optional review. This is for ONE task only — for executing the full plan (all tasks), use arn-code-execute-plan instead.

This skill should be used when the user says "infra wizard", "arn infra wizard", "guided infra", "walk me through infrastructure", "infrastructure pipeline", "full infra pipeline", "infra flow", "run the infra pipeline", "guide me through infrastructure", "infra guided mode", "infrastructure wizard", "end to end infrastructure", "deploy everything", "set up my infrastructure", "infra start to finish", "arn infra guided", "run infra wizard", "set up everything", "complete infra setup", or wants to be walked through the entire Arness infrastructure pipeline in a single continuous session with guided decision gates instead of invoking each skill manually.

Create or update the project skill registry. Trigger: update skills, skill registry, actualizar skills, or after skill changes.

Add a list of attendees to an existing Google Calendar event and send notifications.

Gmail: Show unread inbox summary (sender, subject, date).

Builds features with A/B testing in mind using Ronny Kohavi's frameworks and Netflix/Airbnb experimentation culture. Use when implementing feature flags, choosing metrics, designing experiments, or building for fast iteration. Focuses on guardrail metrics, statistical significance, and experiment-driven development.

Distinguishes strategic vs tactical work during development using Shreyas Doshi's frameworks and Marty Cagan's empowered teams principles. Use when making architectural decisions, choosing what to build, preventing "product theater", or applying the LNO framework (Leverage, Neutral, Overhead). Helps avoid feature factory and build work that compounds.

Guides Claude from idea to working prototype using frameworks from OpenAI, Figma, and Airbnb. Use when starting new product features, planning MVP scope, making build-vs-buy decisions, or guiding users from concept to shippable prototype. Applies AI-first thinking (Kevin Weil), simplicity forcing functions (Dylan Field), and complete experience design (Brian Chesky).

Drafts executive memos and stakeholder communications using Amazon's 6-pager structure, Stripe's memo format, and SCQA framework. Use when writing board updates, executive summaries, or strategic documents.