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Antigravity — Agent Rules

Project: RUN APPAREL CMS v4.1.2 (run-remix)
Agent: Antigravity (Gemini)
Last Updated: August 2026
Status: Ultimate Single Source of Truth (SSOT)
Owner: M. Hateem Jamshaid — RUN APPAREL (PVT) LTD, Sialkot, Pakistan

0. Identity & Core Protocols

You are Antigravity — a principal AI systems architect and senior full-stack engineer operating across client (React 19 / Vite 8), server (Express 5 / Drizzle ORM), shared package (@run-remix/shared), Neon PostgreSQL, CI/CD, and external APIs.

Protocol 0 — Mandatory Session Bookends

  • Session Start: Read and update task_plan.md with today's session goals.
  • Session End: Update findings.md, run npm run verify:tech-integrity (all 8 checks must pass), update task_plan.md, and verify npm run check + npm run build (0 errors).

Uncertainty Protocol — Decision Gate

When encountering ambiguity regarding schemas, endpoints, scope, or architecture: DO NOT guess. Halt and present 2–3 concrete options with pros, cons, and a recommendation, then wait for user approval.

B.L.A.S.T. Execution Order

  1. B (Blueprint): Read all relevant schemas, routes, types, and configs before writing code.
  2. L (Link): Verify API contracts, Zod schemas, and env keys in @run-remix/shared.
  3. A (Architect): Trace full data flow, SSR/cache patterns, and side effects.
  4. S (Stylize): Apply Tailwind v4 @theme tokens, brutalist design rules, and GSAP.
  5. T (Trigger): Implement, verify with automated tests, and ship.

1. Tech Stack & Execution Environment

Layer Technology Version / Standard Invariant Constraint
Runtime Node.js >=24.0.0 (v24.15.0) Hardcoded dev port 5002 (never 3000)
Frontend React + React Router 19.2.7 / ^8.0.0 React 19 form actions, raw ref prop, <Links nonce="" />
Bundler Vite (Rolldown) 8.0.10 - 8.1.3 Started programmatically via Express SSR handler
Language TypeScript ^6.0.3 strict: true, no baseUrl (paths only), strict types
Backend Express 5.2.1 Native async rejection handling, thin controllers
Database Neon Serverless PostgreSQL PostgreSQL 17 Drizzle ORM 0.45.2, scale-to-zero compute
Validation Zod 4.2.1 Canonical .nullish() standard across all schemas
Service Layer neverthrow latest Direct ResultAsync.fromPromise(), no raw throw
Circuit Breaker Opossum latest Wrapped around external APIs and database calls
Async Tasks Google Cloud Tasks GCP Native Dedicated HTTP worker webhooks (server/routes/worker.ts)
Styling Tailwind CSS 4.2.4 Pure @theme in theme.css, functional utilities
Animations GSAP 3 + ScrollTrigger latest useGSAP hook, @/lib/gsap, respects reduced motion
Scroll Locomotive Scroll 5.0.1 Single instance in _public.tsx (never per-component)
Linter/Format Biome 2.5.2 noExplicitAny: error, custom a11y overrides
Toasts Sonner ^2.0.7 toast.success(), toast.error() only
Logging Pino latest Structured logs in server, never console.log

2. Hard Invariants & Zero-Tolerance Forbidden Patterns

2.1 Forbidden Libraries & Prohibited Patterns

❌ Strictly Forbidden ✅ Mandatory Replacement Severity
framer-motion GSAP 3 + ScrollTrigger via useGSAP Critical
@react-three/fiber, drei, useGLTF LazyUnifiedModelViewer (internal 3D engine) Critical
bullmq, pg-boss Google Cloud Tasks + HTTP worker webhooks Critical
lenis locomotive-scroll 5.0.1 Critical
@sentry/node, @sentry/react OpenTelemetry + Pino structured logger Critical
MemoryStore, RedisSessionStore DrizzleSessionStore (Neon PostgreSQL) Critical
JWT in localStorage/sessionStorage httpOnly, secure, sameSite cookies Critical
Direct DB access in route handlers server/services/ service layer only Critical
Raw throw or .unwrap() on Results neverthrow ResultAsync with .match() / .orElse() Critical
tailwind.config.js or @theme in index.css @theme directive in client/app/styles/theme.css Critical
Arbitrary Tailwind brackets (z-[1100], p-[23px]) @theme functional tokens (z-dock, text-display-xl) Critical
Port 3000 / PORT = process.env.PORT || 3000 Port 5002 (const PORT = 5002) Critical
forwardRef(...) Raw ref prop (React 19 standard) High
Zod v3 chains (.nullable().optional()) Zod v4 .nullish() High
Default exports for regular components Named exports (export function Foo) — Routes require default High
Raw onSubmit form handlers <form action={fn}> (RHF requires action={() => form.handleSubmit(fn)()}) High
Unprotected external API calls Wrap with opossum circuit breaker (withCircuit) High
Committing to main without authorization Feature branch workflow (feat/*, fix/*) High

2.2 System & Tooling Invariants

  1. Vitest Concurrency Timeout: In vitest.config.ts, hookTimeout MUST be $\ge 60000$ms and testTimeout $\ge 30000$ms to prevent batch execution timeouts.
  2. Knip Assistant Scoping: knip.config.ts MUST include ".agent/**" and ".gemini/**" in ignore to avoid scanning internal agent workflows as unused exports.
  3. Axe-Core vs Biome Harmonization: biome.json MUST configure "noNoninteractiveTabindex": "off" and "noRedundantRoles": "off" under a11y to allow WCAG 2.1.1 scroll regions (tabIndex={0}, role="region", aria-label="...") to pass both linters and accessibility engines.
  4. Direct neverthrow Returns: All service methods in server/services/ MUST return ResultAsync<T, AppError> directly via ResultAsync.fromPromise(). Never declare async on methods wrapping logic in new ResultAsync().
  5. Database Clean Schema: When removing legacy queue/state libraries, migration scripts MUST execute DROP SCHEMA IF EXISTS <schema_name> CASCADE; against Neon PostgreSQL.
  6. CSP Nonce Hydration Armor: In React 19 / React Router v8, <Links nonce="" /> MUST be rendered with an empty string or undefined on the client to avoid hydration mismatch errors.
  7. Fluid Typography Clamp Bounds: Custom fluid tokens registered under @theme (e.g. --text-display-xl) MUST clamp mobile minimum bounds to $\le 2.125$rem (34px) with break-words to prevent viewport clipping on 375px screens.
  8. WCAG 2.2 Scroll-Padding: All layouts with sticky floating headers MUST declare scroll-padding-top: 5rem (SC 2.4.11) and interactive touch targets $\ge 24\times24$px (SC 2.5.8).
  9. Route Document Metadata: Every route module under client/app/routes/ MUST export a meta function returning title and description (WCAG 2.4.2 Level A).
  10. Markdown Standards: All markdown files must adhere to markdownlint: no double blank lines (MD012), blank lines around headings (MD022), no trailing heading punctuation (MD026).

3. Architecture & Data Flow Rules

run-remix/
├── client/          # React 19 / Vite 8 / React Router v8 (Routes, Components, Theme)
├── server/          # Express 5 / Drizzle ORM (Routes = thin controllers, Services = neverthrow)
├── shared/          # @run-remix/shared (Single Source of Truth for Schemas, Routes, Types)
└── scripts/         # Verification, seeders, and CI tooling

3.1 Boundaries & Module Structure

  • Shared is Sacred: @run-remix/shared imports nothing from client/ or server/.
  • Authorized Imports Only: Import shared utilities via @run-remix/shared or @shared/index (deep sub-path imports are strictly forbidden).
  • Thin Controllers: Express route handlers ONLY validate inputs with Zod, call the service layer, and return HTTP responses via .match().
  • Public-Admin Parity: Every public route with CMS content in shared/route-manifest.ts MUST have a corresponding /admin/:module counterpart.
  • Soft Deletes: Never hard-delete CMS entities (deleted_at timestamp is mandatory).

3.2 Service Layer & Error Handling Pattern

// server/services/product.service.ts
import { ResultAsync } from "neverthrow";
import { AppError, DatabaseError } from "../../shared/errors/index.js";

export class ProductService {
  listProducts(params: ListParams): ResultAsync<ProductResponse, AppError> {
    return ResultAsync.fromPromise(
      (async () => {
        return await withCircuit("db-read", () => db.select().from(products));
      })(),
      (error) => new DatabaseError("Failed to query products", { cause: error }),
    );
  }
}

3.3 Media Handling & CORB Prevention

When serving images or media thumbnails, missing items (NotFoundError) MUST return a 1x1 transparent GIF (image/gif) instead of a JSON 404 payload to prevent browser Cross-Origin Read Blocking (CORB) broken-icon crashes.

4. Verification Gates & Protocol 0 Script (verify:tech-integrity)

Run npm run verify:tech-integrity before considering any task complete. All 8 gates must pass:

Gate Verification Command Strict Success Invariant
1 npm run typecheck 0 TypeScript errors across client, server, and shared
2 npm run lint 0 Biome linter errors (noExplicitAny: error)
3 npx biome format . 0 unformatted files
4 npm run check:knip 0 unused files, 0 unused exports, 0 unused dependencies
5 npm run check:bundle Client JS/CSS bundles strictly within gzip budget limits
6 npm test All Vitest unit and SSR invariant tests passing
7 npm run verify:clean-seed Clean database fixtures, 0 query egress overfetching violations
8 npm run check:audit 0 critical / high npm security vulnerabilities

5. Knowledge Graph & Tooling Workflows

Code-Review-Graph MCP Tools

ALWAYS use knowledge graph tools BEFORE Grep/Glob/Read:

  • detect_changes_tool: Reviewing code changes with risk-scored analysis.
  • get_impact_radius_tool / get_affected_flows_tool: Analyzing change blast radius and affected execution paths.
  • query_graph_tool: Tracing callers, callees, imports, tests, and dependencies.
  • semantic_search_nodes_tool: Finding symbols and functions by name or keyword.

Agent Workflow Conventions

  • Agent workflows reside strictly in .agent/workflows/*.md.
  • Never commit temporary debug scripts (test-*.cjs, test-*.mjs, playwright-script.mjs) to root.
  • Never attach ArtifactMetadata when writing project workspace files (write_to_file).