Best Grok Build plugins for testing
We found 10 listings for testing that you can use with Grok Build. 4 of them are in xAI's official Grok Build marketplace (Browser Use, Clerk, Neon, Superpowers), so they install with grok plugin install <name> --trust. 1 are hand-checked community listings and 5 are Claude Code plugins that Grok Build can load (not tested by us).
How this list was made: every listing in the GrokStacks catalog whose name or description mentions testing terms (testing, test-driven, end-to-end testing, e2e, Playwright, Cypress, unit tests). "Best" here means "available and documented", not a ranking: we haven't benchmarked these, and there are no paid placements in this list. Order: official Grok Build marketplace listings first, then hand-checked community listings, then Claude Code compatible plugins, alphabetical within each group. This is not a ranking.
Comparison
| Name | Source | Type | Skills | MCP servers | Grok install command documented |
|---|---|---|---|---|---|
| Browser Use | Official Grok marketplace | Plugin | 1 | 1 | Yes |
| Clerk | Official Grok marketplace | Plugin | 20 | 1 | Yes |
| Neon | Official Grok marketplace | Plugin | 3 | 1 | Yes |
| Superpowers | Official Grok marketplace | Plugin | 15 | – | Yes |
| Matt Pocock Skills | Community (hand-checked) | Skill | – | – | Yes |
| 42crunch API Security Testing | Claude Code compatible | Plugin | – | – | Claude Code command |
| CodSpeed | Claude Code compatible | Plugin | – | – | Claude Code command |
| Fakechat | Claude Code compatible | Plugin | – | – | Claude Code command |
| Playwright | Claude Code compatible | Plugin | – | – | Claude Code command |
| Unreal Engine Skills For Claude Code | Claude Code compatible | Plugin | – | – | Claude Code command |
Skills and MCP server counts come from xAI's component index or Anthropic's catalog. "–" means none listed or not published in the catalog.
All 10 listings
Browser Use
Give Grok a real browser — the user's own Chrome, with their logins, or an isolated Browser Use Cloud browser. Use it whenever a task involves a website or web app: browsing, scraping and data extraction, filling forms, testing sites, taking screenshots, automating web workflows. Runs locally via uvx; no API key needed for local Chrome.
Clerk
Official Clerk integration. Add Clerk authentication and user management with framework-specific setup, organizations, billing, webhooks, and testing guidance, and manage Clerk applications, users, and instance configuration.
Neon
Neon Serverless Postgres integration (MCP Server + Skills). Get started with Neon, manage projects and databases, pick connection methods, and create branches for migration testing and isolated development.
Superpowers
Core skills library for software development: test-driven development, systematic debugging, collaboration patterns, and proven engineering workflows and techniques.
Matt Pocock Skills
Engineering-discipline skill pack: planning, test-driven development, bug diagnosis and session handoff workflows for coding agents.
42crunch API Security Testing
Automate API security directly in Claude Code with 42Crunch - automatically audit OpenAPI specs, detect vulnerabilities aligned with OWASP API Security risks (including BOLA/BFLA), and apply AI-powered fixes. Designed for AI-assisted development workflows, it provides continuous guardrails through an audit->scan->remediate->validate loop, ensuring APIs meet enterprise security standards before deployment.
CodSpeed
CodSpeed is the all-in-one performance testing toolkit. Dive into benchmarking results, flamegraphs, and performance comparisons — give Claude granular profiling context to pinpoint bottlenecks and autonomously iterate on performance via the CodSpeed MCP server.
Fakechat
Localhost web chat for testing the channel notification flow. No tokens, no access control, no third-party service.
Playwright
Browser automation and end-to-end testing MCP server by Microsoft. Enables Claude to interact with web pages, take screenshots, fill forms, click elements, and perform automated browser testing workflows.
Unreal Engine Skills For Claude Code
Control Unreal Editor directly from Claude Code via MCP. Hundreds of tools exposed via Unreal's ToolsetRegistry across 30+ toolsets: actors, blueprints, materials, Niagara, Control Rigs, Sequencer, State Trees, widgets, Gameplay Ability System, automation testing, and more.