SkillsBento: Free Plugin Marketplace for Codex and Claude Code

Melvin Vivas · X post · 2026-10-01 · Open on X

Topics: AI Dev Tools & Productivity, AI Agents, Tool Use & MCP · Level: intermediate

Summary

Melvin Vivas announces SkillsBento, a free, open-source plugin marketplace for agent skills. You add it once to Codex or Claude Code, then install new plugins as he publishes them. The first plugin available is 'Devil's Advocate'.

Key points

• SkillsBento is a plugin and skills marketplace that works with both OpenAI Codex and Claude Code.
• You only add the marketplace once in your coding agent. After that, you can download new plugins as they come out.
• The 'Devil's Advocate' plugin can already be downloaded.
• The source is open on GitHub at donvito/skillsbento, and the website is skillsbento.com.
• Plugin marketplaces are a way to share reusable agent skills across coding assistants.

Resources mentioned

• skillsbento · website · skillsbento.com · free
  Melvin Vivas's GitHub plugin and skills marketplace for Codex and Claude Code, which includes the devils-advocate plugin.
  Also in: Countering AI Sycophancy with a Devil's Advocate Plugin for Codex & Claude (Melvin Vivas on X · notes), Agent Skill to Analyze Your X (Twitter) Analytics Export (Melvin Vivas on X · notes), Melvin Vivas's open-source AI tools, built with Codex (Melvin Vivas on X · notes), skillsbento: Free Open-Source Agent Skills for Claude (Melvin Vivas on X · notes) and 2 more
• Devil's Advocate (SkillsBento plugin) · tool · skillsbento.com · free
  A plugin whose skill challenges your ideas and shows other perspectives, to counter AI sycophancy.
  Also in: Countering AI Sycophancy with a Devil's Advocate Plugin for Codex & Claude (Melvin Vivas on X · notes)
• Claude Code · tool · code.claude.com · paid · recommended by both Bashiri Smith & Melvin Vivas
  Build agents and pipelines from the terminal; the guide's main agentic coding tool.
  Also in: Create Claude Code Plugins with /plugin-authoring (Melvin Vivas on X · notes), Claude Code mods: customize behavior and UI with plugins (Melvin Vivas on X · notes), AI Engineer Roadmap Overview: From ML Foundations to RAG, Agents & Ops (Bashiri Smith on Facebook · notes), Countering AI Sycophancy with a Devil's Advocate Plugin for Codex & Claude (Melvin Vivas on X · notes) and 101 more
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more

Try this

• Add the SkillsBento marketplace to your Codex or Claude Code setup.
• Install the Devil's Advocate plugin from SkillsBento.
• Write your own agent skill or plugin and publish it in a marketplace for Claude Code or Codex.