Developer Tools

Python-based toolkit for testing local web applications using Playwright browser automation. Manages server lifecycles via `scripts/with_server.py`, supports multiple concurrent servers, and follows a reconnaissance-then-action pattern (navigate, stabilize, inspect, act).

Suite of tools for creating elaborate, multi-component Claude.ai HTML artifacts using React 18, TypeScript, Vite, Parcel, Tailwind CSS, and shadcn/ui. Initializes project scaffolds, develops components, and bundles everything into a single self-contained HTML file.

Creates new skills, modifies existing skills, and measures skill performance through structured evaluation. Workflow: draft skill, write test prompts, spawn parallel subagent runs (with-skill vs baseline), grade results, iterate, and optimize trigger descriptions.

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Covers research, implementation, testing, and evaluation across TypeScript and Python.

Reference MCP server implementing all protocol features — resources, tools, prompts, sampling, and logging. Useful for testing MCP clients.

MCP server that fetches web content and converts it to markdown. Supports HTTP requests with configurable user-agent and content size limits.

MCP server providing file system access — read, write, move, search, and get directory listings within configurable allowed paths.

MCP server for Git repository operations — clone, status, diff, log, commit, branch, and checkout across local repositories.

MCP server that provides persistent memory through a knowledge graph. Stores entities, relations, and observations in a local JSON file.

MCP server that enables dynamic, reflective problem-solving through sequential thought chains with branching, revision, and hypothesis testing.

MCP server that provides current time in various timezones and time conversion between zones using IANA timezone identifiers.

MCP server exposing tools for semantic search over Cloudflare developer documentation using Vectorize.

MCP server for Cloudflare Browser Rendering — take screenshots, generate PDFs, and extract content from web pages at the edge.

MCP server for searching and querying AWS documentation — find service guides, API references, and best practices.

MCP server for Azure DevOps — manage work items, pipelines, repos, pull requests, and boards across Azure DevOps organizations.

MCP server for Sentry — query error events, browse issues, view stack traces, and analyze crash-free rates across projects.

MCP server for GitHub — manage repositories, issues, pull requests, branches, actions, and search code across organizations.

Comprehensive React and Next.js performance optimization guidelines from Vercel Engineering covering 57 rules across 8 categories including waterfalls, bundle size, server-side performance, and data fetching.

React composition patterns that scale — compound components, state lifting, and internal composition to eliminate boolean prop proliferation in reusable component libraries.

Next.js-specific best practices covering file conventions, RSC boundaries, async APIs, data patterns, error handling, route handlers, image/font optimization, bundling, and debugging.

Teaches the Next.js 16 Cache Components feature (PPR) — use cache directive, cacheLife(), cacheTag(), revalidateTag(), and cache invalidation patterns.

Upgrades a Next.js project to the latest version — reads package.json, fetches official migration guide, runs codemods, updates dependencies, walks through breaking changes.

Code reviews following Sentry engineering practices — covers security, performance, testing, and design review for pull requests and code changes.

Creates commits following Sentry conventions with proper conventional commit format and issue references.

Creates pull requests following Sentry conventions for PR titles, descriptions, and issue references.

Finds bugs, security vulnerabilities, and code quality issues in local branch changes.

Iterates on a PR until CI passes — automates the feedback-fix-push-wait cycle for addressing CI failures and review feedback.

Analyzes a repository to generate recommended Claude Code settings.json permissions — detects tech stack, build tools, and monorepo structure.

Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality.

Django performance code review — finds N+1 queries, queryset inefficiencies, and ORM performance problems.

Finds and fixes production issues from Sentry using MCP — analyzes stack traces, breadcrumbs, traces, and context to identify root causes.

Creates Sentry alerts using the workflow engine API — supports email, Slack, PagerDuty, Discord, and other notification actions.

Full Sentry SDK setup for Next.js — error monitoring, tracing, profiling, logging, session replay, and AI monitoring for Next.js 13+ with App Router and Pages Router.

Full Sentry SDK setup for Python — error monitoring, tracing, profiling, logging, metrics, and crons for Django, Flask, FastAPI, Celery, and more.

Full Sentry SDK setup for React — error monitoring, tracing, session replay, profiling, and logging for React 16+ with Router and Redux support.

Full Sentry SDK setup for Go — error monitoring, tracing, logging, metrics, and crons with support for net/http, Gin, Echo, Fiber, and FastHTTP.

Full Sentry SDK setup for Ruby — error monitoring, tracing, logging, profiling, and crons for Rails, Sinatra, Sidekiq, and Resque.

Full Sentry SDK setup for .NET — error monitoring, tracing, profiling, logging, and crons for ASP.NET Core, MAUI, WPF, Blazor, and Azure Functions.

Full Sentry SDK setup for Svelte and SvelteKit — error monitoring, tracing, session replay, and logging.

Guide for using the Cloudflare Agents SDK to build AI agents on Cloudflare Workers, including stateful agents, durable workflows, real-time WebSocket apps, scheduled tasks, MCP servers, and React hooks.

Guide for creating and reviewing Cloudflare Durable Objects, including stateful coordination, RPC methods, SQLite storage, alarms, WebSockets, and Vitest-based testing.

Build sandboxed applications for secure code execution — AI code execution, code interpreters, CI/CD systems, and interactive dev environments.

Analyzes web performance using Chrome DevTools MCP — Core Web Vitals (FCP, LCP, TBT, CLS), render-blocking resources, layout shifts, caching issues, and accessibility gaps.

Guide for building remote MCP servers on Cloudflare Workers with tools, OAuth authentication, and production deployment.

Guide for building AI agents on Cloudflare using the Agents SDK, including state management, real-time WebSockets, scheduled tasks, tool integration, and chat capabilities.

Reviews and authors Cloudflare Workers code against production best practices — streaming, floating promises, global state, secrets, bindings, and observability.

Converts Stitch designs into modular Vite and React components using system-level networking and AST-based validation.

Expert guidance for integrating shadcn/ui components — component discovery, installation, customization, and best practices.

Teaches agents to iteratively build websites using Stitch with an autonomous baton-passing loop pattern and browser automation.

Configures Python projects with modern tooling (uv, ruff, ty) — creating projects, standalone scripts, and migrating from pip/Poetry/mypy/black.

Official OpenAI reference blueprint for building authenticated MCP servers with Python and TypeScript scaffolds for enterprise data in ChatGPT Dev Mode.

Official LangChain MCP server for LangSmith that exposes prompts, traces, datasets, experiments, and billing usage to MCP clients.

Experimental MCP server mode exposed by the GitLab CLI (`glab mcp serve`). This entry uses GitLab's official read-only GitHub mirror for repository metadata enrichment; the canonical source repository is hosted on gitlab.com.

Official Postman MCP server with hosted and local modes for workspaces, collections, environments, API workflows, and code generation.

Official OpenAI Codex skill for answering OpenAI product and API questions with the OpenAI Developer Docs MCP and official documentation sources.

Official LangChain documentation MCP server for audited llms.txt-based documentation retrieval through MCP tools.

Official LangChain integration library for loading MCP tools and resources into LangChain and LangGraph agents.

Official Elastic MCP server for indexed semantic code search, symbol analysis, and structured code investigation workflows.

Official Grafana experimental k6 MCP server for script validation, test execution, documentation browsing, and test script generation.

Official Twilio Alpha proof-of-concept MCP server for turning OpenAPI specifications into MCP tools.

Official Plaid prompt and rules bundle for AI coding assistants building Plaid integrations.

Official Docker MCP gateway and CLI plugin for managing MCP catalogs, profiles, secrets, OAuth flows, and unified gateway access to multiple MCP servers.

Official Confluent Cloud Claude Code package that bundles a Confluent infrastructure MCP server with Claude-oriented workflow helpers, distinct from the general-purpose Confluent Cloud MCP Server.

Official Cohere North reference Python SDK for building authenticated MCP servers with North-specific Streamable HTTP and identity support.

Official Shopify docs-backed local development MCP server for docs search, API schema exploration, Functions, theme validation, and current Shopify development guidance. Install via `npx -y @shopify/dev-mcp@latest`.

Official GitLab docs-backed remote MCP server in Beta for GitLab project data, issues, merge requests, API access, and GitLab-specific operations through AI assistants.

Official Clerk docs-backed remote MCP server for SDK snippets, implementation patterns, and up-to-date authentication guidance in AI coding tools.

Official Mistral docs-backed guide for using MCP clients from Mistral agent and SDK workflows.

Official Clerk docs-backed installable skills for auth setup, organizations, webhooks, testing, and Next.js implementation patterns.

Official Sourcegraph docs-backed remote MCP server for code search, navigation, commit and diff search, and Deep Search workflows.

Official JetBrains docs-backed built-in IDE MCP server. Current replacement for older plugin and proxy variants, exposing IDE tools, project inspection, run configurations, and file operations.

Official Canva docs-backed CLI development MCP server for Canva Apps and Integrations workflows, distinct from the broader Canva MCP Server for runtime design operations.

Official Datadog MCP toolset for feature flag creation, validation, and environment management workflows.