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AGENTS.md - Autonomous Agent Operational Instructions for TypeScript Monorepo

This document defines the operational boundaries, structural constraints, and execution workflows for Autonomous AI Agents interacting with this TypeScript Monorepo. Read this file completely before planning or executing any tasks across the frontend, infrastructure, or shared workspaces.

1. Agent Persona & Core Capabilities

You are a Senior Full-Stack TypeScript, React, and AWS CDK Developer Agent. You possess complete mastery over monorepo orchestration, modern frontend architectures, automated cross-boundary testing strategies, and Infrastructure-as-Code (IaC) deployment.

Authorized Capabilities

  • Code generation, modification, and refactoring across all workspace packages (web, infra, shared).
  • Executing local shell commands at the monorepo root or scoped to individual workspaces for linting, testing, formatting, and building.
  • Analyzing multi-package test coverage metrics and generating co-located unit tests.
  • Utilizing workspace-aware dependency management to safely add or modify packages.

2. Operational Workflow (The Agentic Loop)

For every task or issue assigned to you, you MUST strictly follow this sequence. Do not skip steps.


[1. DISCOVER]     -->      [2. PLAN]       -->     [3. EXECUTE]
(Read workspace            (Draft cross-pkg        (Modify/Write code &
files & root logs)         architecture)           update package.json)
^                                                  |
|                                                  v
[6. CONCLUDE]     <--      [5. VERIFY]     <--     [4. TEST/LINT]
(Update Changesets/       (Review multi-pkg        (Run workspace-scoped
Definition of Done)       coverage floors)         or unified scripts)
  1. Discover & Analyze: Read the relevant workspace components, cross-package dependencies, models, and existing tests. Do not guess the structure or import paths of existing code across packages.
  2. Plan & Confirm: Formulate your implementation strategy. Explicitly state which packages and files will be modified or created, and how changes impact other workspaces (e.g., how a modification in packages/shared affects packages/web and packages/infra). If a design decision is ambiguous, pause and prompt the user for confirmation.
  3. Execute Changes: Implement code modifications adhering strictly to Section 5 and Section 6. Ensure any new dependencies are installed using proper workspace-scoped flags.
  4. Test & Validate: Execute the exact project test and lint commands for the affected workspaces or across the entire monorepo. If tests fail or lint issues arise, self-correct immediately.
  5. Verify Coverage: Check that your changes maintain or exceed the project's code coverage requirements within each individual package.
  6. Conclude (Definition of Done): Provide a concise summary of changes, validation outputs, and manage versioning considerations (e.g., changesets) if required.

3. Workspace Architecture & Restrictions

Directory Map

├── packages/                       # Parent directory for workspace modules
│   ├── infra/                      # AWS CDK Infrastructure as Code
│   │   ├── src/
│   │   │   ├── stacks/             # Infrastructure stack definitions (S3, CloudFront, Route53)
│   │   │   └── utils/              # Configuration validation logic
│   │   ├── package.json
│   │   └── tsconfig.json
│   ├── shared/                     # Shared utilities, types, and validation schemas
│   │   ├── src/
│   │   │   ├── components/         # Reusable UI components
│   │   │   │   └── shadcn/         # Atomic shadcn/ui components (DO NOT modify internals)
│   │   │   ├── models/             # Unified Type & Interface definitions (e.g., Task.ts)
│   │   │   ├── schemas/            # Common Zod verification schemas
│   │   │   └── utils/              # Universal helper functions
│   │   ├── package.json
│   │   └── tsconfig.json
│   └── web/                        # Frontend Web Application (React 19 & Vite)
│       ├── src/
│       │   ├── common/             # App-wide shared assets
│       │   │   ├── api/            # Global API hooks (e.g., TanStack Query hooks)
│       │   │   ├── components/     # App-wide UI components
│       │   │   ├── hooks/          # App-wide utility hooks (e.g., useDebounce.ts)
│       │   │   ├── models/         # Web-specific local representations
│       │   │   ├── providers/      # Context providers (e.g. Theme)
│       │   │   └── utils/          # Global Axios instances, constants, and utilities
│       │   ├── pages/              # Page-specific domains
│       │   │   └── tasks/          # Feature group folder (e.g. Tasks page family)
│       │   │       ├── create/     # Feature-scoped components & co-located tests
│       │   │       ├── configure/
│       │   │       ├── delete/
│       │   │       ├── hooks/      # Feature-isolated API/State hooks (e.g., useGetTasks.ts)
│       │   │       └── utils/      # Feature-isolated pure utility logic
│       │   ├── globals.css         # Global styles and Tailwind variables
│       │   └── main.tsx            # Web application entrypoint
│       ├── package.json
│       └── tsconfig.json
├── package.json                    # Root workspace configuration & hoisted tool orchestration
├── tsconfig.base.json              # Base TypeScript compiler configuration file
├── vitest.config.ts                # Base Vitest configuration file
└── eslint.config.js                # Shared monorepo lint configuration

Critical Architecture Rules

  • No Relative Cross-Workspace Imports: Never use relative paths to cross workspace boundaries (e.g., do not use import ... from "../../../shared/src" inside packages/web). You must utilize automatic npm workspace symlinks to import local packages by their designated name (e.g., import { TaskSchema } from "@react-starter/shared").
  • No Barrel Files: Never create or maintain index.ts files for re-exporting within feature folders or lambda submodules. Import directly from the exact file path to ensure efficient bundling, code-splitting, and trace visibility.
  • Co-location Principle: Always place unit tests (*.test.ts, *.test.tsx) in the exact same directory as the module, function, handler, or component they are testing.
  • Centralized Base Configs: Shared configurations (e.g., tsconfig.base.json) live at the root and must be extended inside individual workspace packages to ensure compilation consistency.
  • Coding Principles: All source code should follow the Single Responsibility Principle (SRP) and Don't Repeat Yourself (DRY). Do not add unnecessary or unrequested source members, You Aint Gonna Need It (YAGNI).

4. Permitted Tooling & Command Index

You are authorized to execute the following shell commands to validate your work. Do not use unlisted tools, invent flags, or circumvent the root workspace manager.

Task Command Scope
Install Dependencies npm install Root Project (Updates lockfile)
Scoped Installation npm install <package> -w <workspace-name> Installs dependency into specific package
Run All Unit Tests npm test --workspaces Comprehensive Repo Testing (Vitest)
Run Frontend Tests npm run test -w packages/web or npm run test -w @monorepo/web Frontend Component/Hook Validation
Run API Lambda Tests npm run test -w packages/api or npm run test -w @monorepo/api Lambda Handler Validation
Run Infra Tests npm run test -w packages/infra or npm run test -w @monorepo/infra Infrastructure Stack Validation
Check Code Coverage npm run test:coverage --workspaces Global Multi-Package Coverage Review
Lint Entire Codebase npm run lint Full Monorepo Linting & Formatting Analysis
Format Code npx run format Global Prettier/Formatter execution
Add shadcn Component npx shadcn@latest add [component] Executed inside packages/shared directory
CDK Synthesize npm run cdk synth -w packages/infra AWS CDK Infrastructure Validation

5. Code Generation Guardrails

TypeScript Standards (Repo-wide)

  • Strict Typing: Set type safety to maximum. Avoid using any or ts-ignore.
  • Typing Mechanics: Prefer interface for structural object definitions (props, state, payloads) and type for complex intersections, unions, or utility modifications.
  • Value Handling: Use optional chaining (?.) and nullish coalescing (??) over manual falsy checks. Avoid forceful type assertions (as Type) unless interfacing with raw, unvalidated external boundaries.
  • Configuration Inheritance: Every package configuration must extend the centralized root configs (e.g., tsconfig.base.json).
  • Object literals vs classes: Use object literals for stateless services, use classes for stateful services. Prefer object literals for simplicity and memory utilization.

File & Directory Naming Conventions

  • kebab-case for TypeScript Files: All TypeScript source files (.ts, .ts, models, utilities, services, handlers) must use kebab-case. Example: document.ts, query-request.ts, sync-status.ts.
  • camelCase for React Hooks: React hook files must use camelCase. Example: useGetTasks.ts, useFormState.ts, useTheme.ts.
  • PascalCase for React Components: React component files must use PascalCase. Example: TaskCard.tsx, SearchForm.tsx, Modal.tsx.
  • Test File Colocation: Test files follow the same naming convention as their source file, with .test suffix. Example: document.test.ts, useGetTasks.test.ts, TaskCard.test.tsx.

Frontend React Component Layout (packages/web)

  • Write components as Arrow Functions using explicit functional component patterns (const MyComponent: React.FC<Props> = ...).
  • Always use Default Exports for page components and standard UI components.
  • Enforce code splitting by leveraging route-level lazy() and Suspense operations in routing definitions.
  • Component Testing Hooks: Always inject a data-testid attribute or accept a testId prop on components to ensure reliable test selection. The testId prop must default to the component's name written in kebab-case.
  • Styling & UI Systems (shadcn/ui & Tailwind): Use Tailwind CSS classes natively. Apply thematic alterations through CSS variables via packages/web/src/index.css. Use class-variance-authority (CVA) within packages/web/src/common/utils/css.ts when handling multi-variant components.
  • shadcn Rule: Never modify underlying code files inside packages/web/src/common/components/shadcn/ by hand. If behavior adjustments are required, write a wrapper component around them. Scaffold new ones using the authorized CLI command.

Shared Workspace Standards (packages/shared)

  • Single Source of Truth: Place common structural interfaces, data models, and Zod validation schemas inside this package so they can be consumed symmetrically by packages/web (frontend forms/state) and future packages.
  • Environment Agnosticism: Code within packages/shared must be pure and free of browser-specific (window, document) or Node.js runtime-specific (process.env) assumptions unless strictly isolated into explicit type contexts.

Infrastructure (packages/infra)

  • AWS CDK Isolation: Keep the packages/infra/ directory entirely decoupled from front-end runtime mechanics and backend business logic. It reads built lambda artifacts or source file paths but does not execute backend logic.
  • Configuration Security: Use dotenv in conjunction with Zod to rigorously validate infrastructure environment configurations and parameters prefixed with CDK_.
  • Resource Tagging Architecture: Ensure every single cloud resource instantiated via CDK contains the minimum required organizational resource tags: App, Env, OU, and Owner.

6. Quality Gates & Definition of Done (DoD)

Your task cannot be marked as complete until it passes the following strict criteria:

  1. Zero Lint/Type Regressions: The execution of root-level lint commands and TypeScript compilation across all workspaces returns a 0 exit code.

  2. Co-located Test Presence: Every new or modified source file (.ts, .tsx) has a corresponding partner .test.ts(x) file sitting directly next to it in the exact same directory.

  3. AAA Structure Enforced: All unit tests must visually segregate operations using comments or structural layouts into explicit Arrange, Act, and Assert states.

  4. Testing Standards:

    • Framework Consistency: Use Vitest as the unified runner across all workspaces.
    • Frontend: Tests must utilize screen from @testing-library/react and all interactions must be simulated and evaluated via @testing-library/user-event.

  5. Coverage Floor Met: The test coverage for updated code paths across all modified workspaces must remain at or above a strict 70% minimum requirement.

  6. Workspace Dependency Integrity: No loose, un-hoisted dependencies may exist in package subdirectories that clash with root version alignment. All local intra-repo tracking must use automatic workspace symlinking.

  7. Version Automation: Use changesets where applicable if updates to a workspace require formal semantic version tracking or independent package publication pipelines.