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Agent Skill Marketplace

A production-minded SaaS platform for the full lifecycle of reusable agent skills. Users browse categorized skills with eval scores and run counts, test them in a live browser sandbox with permissioned execution and detailed trace events (latency, cost, blocked commands), build and publish new skills, compare versions with SKILL.md diffs, run evaluation suites with regression detection, and one-click export/install skills directly into Codex, Claude, Antigravity, OpenCode, Grok, and VS Code. Built as a Next.js App Router application with a Prisma-backed data model on Postgres.

Next.js App RouterTypeScriptTailwind CSSPrismaPostgresVercel

Problem

What it solves.

AI agent capabilities are currently locked inside individual monolithic codebases, making them difficult to discover, trust, safely test, version, or share across teams. The marketplace turns skills into portable, evaluated, sandbox-testable SKILL.md packages with clear governance, execution traces, and easy installation into popular developer tools.

What I built

The specific parts I implemented.

›Marketplace discovery, filtering & skill cards UI
›In-browser sandbox runner with live traces & permission approvals
›Skill builder with validation, preview, test run & publish flow
›Version history with SKILL.md comparison & diffing
›Evaluation suites + regression indicators
›One-click install/export adapters for multiple AI tools & editors

What I owned

My responsibility surface.

Product direction & marketplace positioning

Full-stack implementation (Next.js App Router + Prisma)

Sandbox runtime semantics, trace model & permission system

Skill packaging standards & export/install flows

Developer experience & UI/UX

Architecture

How data moves through the system.

run / tracelive tracesNext.js Marketplace UI(cards, filters, builder)API routes + server actionsBrowser Sandbox Runner(traces, permissions, cost/latency)Skill Builder + Validator+ preview & test runSKILL.md Registry+ versioning & diffsPostgres (Prisma ORM)Install/Export Adapters(Codex, Claude, VS Code, etc.)

Next improvements

Known gaps & next moves.