A catalog of ChatGPT & Codex plugins, sorted by people.
Best MCP servers & Codex plugins for testing
31 plugins in our catalog say they help with testing. Here are the top 12, editor's picks first, then by GitHub stars. Most of them sit in Review & Testing and Agent Workflows.
How to choose
- Match the host first: Codex and Claude Code install commands differ, and the install line below shows which one each project targets.
- Check where it runs. Hosted MCP endpoints are quicker to set up but send your requests to someone else's server.
- Prefer a recent push and a real license (MIT or Apache-2.0) for anything you'll use at work.
- Stars tell you how many people looked, not whether it works. Read the code before you install.
The list
1. Brooks Lint Editor's pick
AI code reviews grounded in six classic engineering books — decay risk diagnostics with book citations, severity labels, and four analysis modes (PR review, architecture audit, tech debt, test quality).
★ 1,577 · MIT · pushed 2026-11-15 (this week) · plugin · by hyhmrright
/plugin marketplace add hyhmrright/brooks-lint
2. e2e
Write, run, and debug end-to-end tests for web and mobile apps with agent skills and an MCP server.
★ 13,906 · Apache-2.0 · pushed 2026-11-15 (this week) · MCP server, skills · by tester-army
3. LinkedIn Skills
Codex-ready LinkedIn marketing bundle with a native .codex-plugin manifest and 10 skills: post writing with 16 tested hook formulas, AI-tell humanizer, pre-publish audit, comment and reply drafting, hook extraction, content planning, profile optimization, engager analytics, and thread monitoring; also works in Claude Code.
★ 5,930 · MIT · pushed 2026-11-10 (this week) · plugin, skills · by sergebulaev
codex plugin marketplace add sergebulaev/linkedin-skills
4. sandbox-mcp
MCP server and CLI that automate Windows Sandbox, giving your coding agent fresh, throwaway Windows machines to test apps in.
★ 433 · MIT · pushed 2026-11-12 (this week) · MCP server · by Scott Hanselman
5. Superloopy
Evidence-gated Codex loop harness with specialist skills, including near-pixel authorized website cloning backed by screenshots, assets, build output, and visual QA.
★ 114 · MIT · pushed 2026-10-29 (last 30 days) · plugin, skills · by beefiker
codex plugin marketplace add https://github.com/beefiker/superloopy
6. Hera Agent Unity
Controls and verifies a live Unity Editor through a low-token CLI, with scene, asset, Inspector, Play Mode, test, screenshot, and runtime C# workflows for Codex and other coding agents.
★ 30 · Apache-2.0 · pushed 2026-10-29 (last 30 days) · plugin · by NotNull92
codex plugin marketplace add NotNull92/hera-agent-unity --ref main
7. RepoPilot
Snapshots each Codex session and stops the agent when it weakened tests, suppressions, or CI gates, once per signal; local and deterministic.
★ 24 · Apache-2.0 · pushed 2026-11-10 (this week) · plugin · by MykytaStel · alternatives
/plugin marketplace add MykytaStel/repopilot
8. WorkMagic agent plugin
Ask your WorkMagic marketing data anything (attribution, lift tests and budget plans) from Claude, ChatGPT, Codex, Cursor, Copilot and Gemini.
★ 23 · MIT · pushed 2026-11-13 (this week) · plugin · by WorkMagic
/plugin marketplace add workmagicio/workmagic-agent-plugin
9. Codex How To
Engineering-first Codex curriculum and plugin with 9 skills, measured token-efficiency experiments, bounded orchestration, testing, review, and living knowledge maintenance.
★ 21 · MIT · pushed 2026-11-13 (this week) · skills · by Phelan164
npx skills add Phelan164/codex-howto --skill engineering-loop -g -a codex -y
10. Codex Agenteam
Specialist AI agents (researcher, PM, architect, developer, QA, reviewer) orchestrated as a configurable team pipeline.
★ 15 · MIT · pushed 2026-07-06 (132 days ago) · plugin · by yimwoo · alternatives
11. Hera Agent Godot
Drives a live Godot 4.x editor through the low-token Hera CLI — scene, node, and signal edits, play control, and runtime QA with verifiable compact JSON output, with the companion addon published on the official Godot Asset Store.
★ 11 · MIT · pushed 2026-10-23 (last 30 days) · plugin · by NotNull92
/plugin marketplace add NotNull92/hera-agent-godot
12. since-cutoff
Finds the pinned Python dependency APIs that changed after the model's training cutoff, tests which ones the model actually gets wrong, and writes one-line AGENTS.md notes that are kept only if their example type-checks.
★ 10 · MIT · pushed 2026-10-25 (last 30 days) · plugin · by MohammadHijjawi97
/plugin marketplace add MohammadHijjawi97/since-cutoff
Matched by keywords in each project's own name and description. The topic comes from what people actually type into Google and Bing search boxes.
All comparisons and use cases →
Data from GitHub and each project's README, checked 2026-11-15. We haven't installed or audited these, and stars measure attention, not quality. Paid placements never change this page. Spot a mistake? hello@pickaplugin.com
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