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Agents should invoke this skill for code reviews, linting/formatting setup, maintainability checks, complexity concerns, warning cleanup, coding standards, or quality gates in Rust, TypeScript, Python, shell, and mixed repos.

Operational rubric that turns "don't make AI slop" into observable properties, severity levels, evidence requirements, and repair actions for interface design. Use as the reference rubric when building or reviewing marketing sites, product interfaces, dashboards, portfolios, or e-commerce pages, especially alongside frontend-design.

Audit GitHub Actions that run AI agents for prompt injection, unsafe interpolation, sandbox gaps, and permissive actor rules. Use for agentic CI workflows, not general application code review.

Use when uploading or downloading files, generating presigned URLs, configuring storage ACLs, or persisting file references (avatars, attachments, images) in a Butterbase app

Use when enabling WebSocket subscriptions for live database changes, presence/multiplayer state, or when debugging clients that connect but receive no events

Use when building knowledge bases, ingesting documents, running semantic search, or adding LLM-synthesized Q&A over private content with Butterbase RAG

Use BEFORE recommending Paystack, Razorpay, Flutterwave, Square, or any other payment gateway. Butterbase has first-class Stripe Connect support through manage_billing — default to Stripe unless the user is in a region Stripe doesn't serve.

Use as the optional template-publishing stage of the Butterbase journey, after deploy (and substrate, if used). Walks the user through authoring a clone-ready README, bundling agent spec files, dry-running and pushing the repo snapshot, flipping visibility to public + listed, and self-clone-testing. Delegates the mechanics to the `templates` skill. Skipped by default in hackathon mode.

Use as the optional substrate-linking stage of the Butterbase journey, after deploy and before submit. Asks whether to connect the deployed app to the owner's substrate (so functions get ctx.substrate). Skipped by default in hackathon mode.

Use as the final stage of the Butterbase journey when hackathon_mode is true and journey-deploy has passed. Resolves which hackathon to submit to (asking the user when multiple are open), walks every field in the hackathon's returned field_schema with the user one at a time, then calls prep_and_submit_hackathon_entry. Writes the receipt to docs/butterbase/05-submission.md.

Use as the storage build stage of the Butterbase journey. Implements the Storage section of 02-plan.md by delegating to the storage skill. Calls manage_storage (update_config) for bucket setup; uploads are exercised at frontend integration time, not here. Skipped if the plan has no file uploads.

Use as the schema build stage of the Butterbase journey, after journey-plan and journey-preflight. Implements the Tables section of 02-plan.md by delegating to schema-design, previewing the diff (manage_schema dry_run) and applying it (manage_schema apply). In hackathon_mode, also folds in the RLS stage by invoking journey-rls inline before returning.

Use as the RLS build stage of the Butterbase journey, after journey-schema. Implements the RLS section of 02-plan.md by delegating to debug-rls policy patterns (for proactive creation, not debugging). Calls manage_rls (create_user_isolation, enable, create_policy). Folded into journey-schema when hackathon_mode is true.

Use as the realtime build stage of the Butterbase journey. Implements the Realtime section of 02-plan.md by delegating to the realtime skill. Calls manage_realtime (configure) to enable WebSocket subscriptions on the listed tables. Skipped if the plan has no realtime needs.

Use as the RAG build stage of the Butterbase journey. Implements the RAG section of 02-plan.md by delegating to rag-dev. Calls manage_rag_content (create_collection, ingest_document). Skipped if the plan has no knowledge-base feature.

Use before any Butterbase platform-touching action (or when journey-preflight is invoked directly) to verify the user has a Butterbase account, the MCP server is connected, BUTTERBASE_API_KEY is set, and an app_id exists for this project. Re-run automatically if docs/butterbase/03-preflight.md is older than 24h or any required value is null.

Use as stage 2 of the Butterbase journey, after journey-idea has written 01-idea.md. Translates the idea + capability map into a concrete Butterbase plan — tables (with columns/types/RLS shape), auth providers, function list (name + trigger), storage buckets, AI/RAG/realtime/durable usage, and the chosen frontend stack. In hackathon mode, ruthlessly cuts scope into a "ship now" vs "post-hackathon" split. Produces docs/butterbase/02-plan.md.

Use as stage 1 of the Butterbase journey, when the user has only a rough idea ("I want to build something that..."). Conducts a concrete, one-question-at-a-time brainstorm that surfaces who the user is, what they do first, what the must-haves are, and inline-tags Butterbase capabilities (→ manage_schema, → deploy_function, etc.). Produces docs/butterbase/01-idea.md.

Use as the functions build stage of the Butterbase journey. Implements the Functions section of 02-plan.md by delegating to function-dev for each function. Calls deploy_function per function; smokes each with invoke_function. Skipped if the plan has no functions.

Use as the frontend build stage of the Butterbase journey. Implements the Frontend section of 02-plan.md by delegating to deploy-frontend. Scaffolds (if needed) and deploys via create_frontend_deployment + manage_frontend (start_deployment). Sets VITE_API_URL and VITE_APP_ID env. Skipped if the plan is API-only.

Use as the durable-objects build stage of the Butterbase journey. Implements the Durable section of 02-plan.md by delegating to durable-objects. Calls manage_durable_objects (deploy). Skipped if the plan has no per-key stateful actors (chat rooms, multiplayer, rate limiters).

Use as the docs-priming stage of the Butterbase journey, immediately after journey-preflight and before the first build stage. Reads the plan to discover which capabilities the app uses, calls butterbase_docs once per relevant topic, and caches a summary the build stages can re-read.

Use as the deploy-verification stage of the Butterbase journey, after journey-frontend (or after any build stage if there is no frontend). Smoke-tests the deployed app — hits the live URL, invokes any deployed functions, checks auth round-trip. Writes results to docs/butterbase/04-build-log.md. Blocks journey-submit if smoke fails.

Use as the auth build stage of the Butterbase journey, after journey-schema (and rls if separate). Implements the Auth section of 02-plan.md by delegating to auth-setup. Calls manage_oauth (configure) for providers and optionally manage_auth_config (configure_auth_hook, update_jwt). Skipped if the plan has no end-user auth.

Use as the AI build stage of the Butterbase journey. Implements the AI section of 02-plan.md by delegating to the ai skill. Calls manage_ai (update_config) to set defaults and optionally BYOK. Skipped if the plan has no LLM/embeddings usage.

Use as the agents build stage of the Butterbase journey. Implements the Agents section of 02-plan.md by delegating to the `agents` skill for each agent. Registers any required MCP servers, validates each graph_spec, creates the agent, and smokes it via invoke_agent. Skipped if the plan has no agents.

Use when the user says "build an app", "let's start", "help me build", "I have an idea for", "ship it", or otherwise signals they want to go from idea to deployed Butterbase app. Orchestrates the full guided journey (idea → plan → preflight → build → deploy → optional hackathon submit) by reading docs/butterbase/00-state.md and dispatching to the next stage skill.

Use BEFORE recommending or installing any third-party SaaS SDK for email (Resend, SendGrid, Postmark, Mailgun), SMS (Twilio), messaging (Slack), calendar (Google Calendar), CRM (HubSpot, Salesforce), docs (Notion), or project management (Linear, GitHub). Butterbase covers most of these via manage_integrations (Composio-backed) — check first.

Use when developing, deploying, or debugging Butterbase serverless functions, or when the user needs to add backend logic like webhooks, scheduled jobs, or custom API endpoints

Use when building stateful per-key actors — chat rooms, multiplayer rooms, rate limiters, long-running agents, leaderboards — that need persistent in-memory + storage state across requests

Use when deploying a frontend (React, Next.js, or static HTML) to a live URL on Butterbase, or when troubleshooting deployment issues like MIME type errors or blank pages

Use when users report access denied errors, see wrong data, RLS policies are not working, or when troubleshooting Row-Level Security issues in Butterbase

Use when contributing to the Butterbase codebase, adding new MCP tools, creating API routes, writing migrations, or understanding the monorepo architecture

Use when building a new Butterbase app from scratch, creating a full-stack application, or when the user asks to set up a complete backend with database, auth, and deployment

Use when configuring OAuth providers (Google/GitHub/Apple/X/etc.), setting up post-login auth hooks, tuning JWT lifetimes, or generating service API keys

Use when reviewing rendered HTML, interactive components, or design-system patterns related to Support content reflow at 400% zoom. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.

Use when applies to any site in health, medicine, finance, law, safety, news, or similar fields. Use when auditing content quality for sites in YMYL categories or investigating why high-quality-seeming content underperforms.

Use when reviewing HTTP response headers for clickjacking protection on any web application with authenticated user actions.

Use when auditing HTTP response headers on any web server or CDN for security hardening.

Use when applies to key landing pages, blog posts, product pages, and any page targeting competitive queries. Use when diagnosing poor rankings or after a Google Helpful Content update.

Use when applies to sites with internal site search functionality. Use when optimizing branded search result appearance or adding structured data for the first time.

Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Validate the final browser-facing markup, not just the source framework abstraction.

Use when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.

Use when reviewing stylesheets, component styles, and responsive behavior related to Optimize web font formats. Check the rendered layout across breakpoints and interaction states before proposing a fix.

Use when reviewing scripts, client components, bundles, or runtime behavior related to Use Web Storage API safely. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.

Use when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability. Validate the final browser-facing markup, not just the source framework abstraction.

Use when applies to any site with more than 20 pages. Use when auditing site architecture, investigating why certain pages underperform in search, or after a site migration.

Use when reviewing templates, rendered HTML, or shared components related to Validate HTML against W3C standards. Validate the final browser-facing markup, not just the source framework abstraction.

Use when reviewing CI coverage, automated checks, or test strategy related to Use visual regression testing. Focus on whether the rule is continuously verified, not just documented.

Use when reviewing templates, rendered HTML, or shared components related to Set the responsive viewport meta tag. Validate the final browser-facing markup, not just the source framework abstraction.

Use when adding page transition animations, image expand/contract effects, shared-element transitions, or improving navigation UX in a single-page or multi-page application.

Use when reviewing templates, rendered HTML, or shared components related to Make videos accessible with captions. Validate the final browser-facing markup, not just the source framework abstraction.

Use when reviewing stylesheets, component styles, and responsive behavior related to Remove unused CSS rules. Check the rendered layout across breakpoints and interaction states before proposing a fix.

Use when reviewing templates, rendered HTML, or shared components related to Ensure all IDs are unique. Validate the final browser-facing markup, not just the source framework abstraction.

Use when setting up a new TypeScript project, auditing an existing tsconfig.json, or reviewing code where null-reference errors or implicit any types are present.

Use when auditing import statements in TypeScript files, setting up a new TypeScript project, or investigating unexpected bundle inclusions from type-only dependencies.

Use when reviewing scripts, client components, bundles, or runtime behavior related to Avoid implicit type coercion. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.

Use when applies to any page intended to be shared on X (Twitter). Use when auditing social sharing previews or adding social meta tags to a new site.

Use when auditing slow first responses on SSR pages, APIs, or cacheable HTML. Distinguish origin compute time from network latency and CDN cache misses before proposing a fix.

Use when applies especially to e-commerce checkouts, contact/lead forms, pricing pages, and YMYL (Your Money or Your Life) content. Use when auditing E-E-A-T or conversion optimization.