Works with the AI Agents you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+21 more

    Maintainable Web Code Handbook

    1

    Turns messy TypeScript, React, and Node code into readable, testable, low-refactor-risk code with concrete, review-ready rules.

    Free

    1 useSecurity scanned
    Maintainable Web Code Handbook

    Maintainable Web Code Handbook

    Example session with this skill installed

    Refactor src/features/checkout in our React + Node repo before Friday's release. CheckoutPage.tsx is 420 lines and does fetching, validation, and analytics at once; the order API returns inconsistent error shapes; and there are any types all over api/checkout-client.ts. Apply our maintainability standards: split the component into focused pieces, move reusable logic into hooks, add zod validation at the route boundary, introduce structured errors mapped to HTTP codes, and make response shapes consistent everywhere. List every file you touched, report before/after metrics, and flag anything you would defer to a follow-up PR.

    • Read your context and instructions
    • Compiled the maintainable web code
    • Generated the UI component

    Summary

    Reviewed 11 files in src/features/checkout and the order API route, applying the maintainability rules: split the 420-line mega-component, narrowed loose types, validated inputs at the edge, and standardized error handling.

    MetricBeforeAfter
    Largest componentCheckoutPage.tsx, 420 lines3 focused components, max 95 lines
    any usages14 in checkout-client.ts0 (zod schemas, unknown at the edge)
    Error shapes4 ad-hoc formats{ error: { code, message } } everywhere
    Awaits in create flow3 sequential1 Promise.all (parallel, ~380ms saved)
    Silent failures2 bare catchesNotFoundError / ValidationError mapped to 404/422

    Files touched: CheckoutPage.tsx, useCheckoutFlow.ts (new), PaymentForm.tsx, api/checkout-client.ts, server/routes/orders.ts, server/errors.ts (new).

    Next steps

    • Add unit tests for useCheckoutFlow state transitions.
    • Migrate features/accounts to the same slice pattern.
    • Replace offset pagination on /api/orders with cursor pagination.

    CheckoutPage.tsx

    TSX · React component

    Generated

    Example file from a real run - the skill writes it into your workspace.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Stop fighting technical debt and unreadable PRs. This skill enforces a practical standard for TypeScript, React, and Node.js codebases that prioritizes long-term maintainability over clever abstractions. It helps you build systems where data contracts are validated at the boundaries, errors are structured, and components have clear responsibilities.

    What it does

    • Refactors messy logic by applying guard clauses, discriminated unions, and pipeline patterns to simplify complex functions.
    • Enforces data integrity using Zod-style validation at API and environment boundaries to catch runtime errors early.
    • Optimizes React architecture by deriving state, extracting custom hooks, and ensuring effects have proper cleanup and stable dependencies.
    • Standardizes API design using resource-based routing, consistent response shapes, and cursor-based pagination.
    • Improves testability by decoupling service logic from transport layers and focusing on behavior-driven assertions.

    How it works

    1. Analyze: Provide a code snippet, component, or API route for a maintainability audit.
    2. Refactor: Request specific improvements like "narrow these types" or "separate transport from service logic."
    3. Review: Use the built-in checklist to evaluate a pull request for naming clarity, error handling, and state ownership.

    Frameworks & tools

    Primary support for TypeScript and JavaScript. Optimized for React, Node.js, Zod, and RESTful API patterns. Works with standard testing libraries like Jest or Vitest.

    Why this beats prompting it yourself

    Generic prompts often suggest "clean code" that is too abstract or overly academic. This skill uses concrete, production-tested rules specifically tuned for the intersection of frontend UIs and backend services.

    Use cases

    • Refactoring a bloated React component that handles too much local state and side effects.
    • Designing a new Node.js service layer that needs to be independent of its HTTP entry points.
    • Hardening an API endpoint with proper input validation and structured error responses.
    • Performing a high-signal code review focused on readability and refactor-risk.

    Known limitations

    Does not provide mass formatting or linting fixes. Focuses on architectural and logical patterns rather than CSS or aesthetic design.

    Guidance only: it does not run your test suite or linter, so mechanical enforcement still needs your own tooling. Examples assume a modern stack (React hooks, zod, Fetch API) and may need adapting for older codebases.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

    Reviews

    No reviews yet

    Be one of the first to try it. Every listed skill goes through the trust checks below.

    Security scanned

    Checked by our 8-point scan before listing

    1 use

    Times used to date

    Free to use

    No account required to browse

    Trust & safety

    Security scan

    Security scan passed 1 month ago

    • Free with an Agensi account

    Requires

    Node.js

    Permissions

    Network Access
    Environment Variables
    Read Files
    Write Files

    File Scopes

    src/**
    *.ts
    *.tsx
    *.js
    *.jsx

    Read and write access to source files is needed so the agent can review, refactor, and restructure TypeScript/JavaScript code in your repository.

    Listed1 month ago

    What's inside

    Frequently Asked Questions

    This skill provides specific architectural guidance for TypeScript and React, moving beyond generic "clean code" to enforce production-ready patterns like discriminated unions, Zod validation, and decoupled service layers.

    Yes, while it excels at React and Node.js, the core principles of data integrity, guard clauses, and pipeline patterns apply to any modern TypeScript or JavaScript project.

    The skill works best by analyzing specific code snippets, components, or API routes you provide; it will then offer refactoring suggestions or a structured maintainability audit based on its internal handbook.

    It focuses on logical architecture and type safety rather than visual styling; it will not fix your CSS, but it will help you refactor the state and logic that powers your components.

    The skill is compatible with any major AI agent platform that supports custom instructions or tool integration, requiring no complex installation beyond a standard setup within your preferred workspace.

    Your agent reviews and refactors TypeScript, React, and Node files per the handbook rules, but changes land as normal edits or diffs you approve — review them in git before committing.

    TypeScript and JavaScript codebases using React UIs, Node services, and HTTP APIs. Examples use zod and the Fetch API; the rules themselves are library-agnostic.

    No — it targets readability, reliability, and structure (naming, types, error handling, file layout), not formatting, so it complements your existing linter and style tooling.

    New in Code Quality & Review

    Free