---
title: "agent-builder"
description: "Creates, evaluates, and packages confirmed capabilities as one-agent-with-licensed-skills plugins."
canonical: https://agentpluginsdirectory.com/plugins/agent-builder
last-updated: 2026-09-21
---

# agent-builder
Creates, evaluates, and packages confirmed capabilities as one-agent-with-licensed-skills plugins.
- Slug: agent-builder
- Publisher: Tien Nguyen
- Repository: https://github.com/tiennguyentt/agent-plugins
- Manifest: agent-builder/plugin.json
- Version: 2.6.0
- License: MIT
- Category (editorial): agent-tooling
- Skills: 4 (create-capability, evaluate-capability, no-ai-slop, package-plugin)
- MCP servers: 0
- Stars: 0
- Repository created: 2026-07-31
- Repository last pushed: 2026-08-14
- Publisher type: User
- Listing: https://agentpluginsdirectory.com/plugins/agent-builder
- Schema: https://agent-plugins.org/schemas/1.0.0/plugin.schema.json

## What agent-builder does, in the publisher's words

One independent agent plugin in the agent-plugins marketplace:

Distribution mode: dual Standalone entry: create-capability walks for a.git root, finds no the consuming repo's own rules file, and runs its refuse-and-scaffold path off the four bundled forms Portable core: skills/ Portable entry skill: create-capability Bundled equivalents: references/forms/agent-spec.md -> skills/create-capability/references/forms/agent-spec.md, references/forms/skill-spec.md -> skills/create-capability/references/forms/skill-spec.md, references/forms/workflow-spec.md -> skills/create-capability/references/forms/workflow-spec.md, references/forms/agent-plugin-spec.md -> skills/create-capability/references/forms/agent-plugin-spec.md Codex project agent: optional overlay

The last three joined the list on 2026-08-07. They were always used, the consuming repo's own rules file for the law a build may not cross, evaluation-plane/ for the eval route a capability owes, and graph-plane/ for the trace a run has to land in, but the declaration named only the first three, so three real runtime dependencies travelled undeclared.

From the project README, punctuation lightly normalized. Full text: https://raw.githubusercontent.com/tiennguyentt/agent-plugins/HEAD/agent-builder/README.md

## Skills

- create-capability: Use when the user asks to create, build, or add an agent, skill, workflow, plugin, automation, or recurring capability, including "build me an agent", "tạo agent", "cần một workflow", "automate my inbox", "thêm khả năng X", or "I need my OS to handle Y". Do NOT use to write a standalone planning do…
- evaluate-capability: Use when the user asks to review, evaluate, verify, or grade a proposed or active capability against its confirmed specification, guardrails, evaluation evidence, runtime behavior, and Definition-of-Done. Do NOT use when there is no standard to judge against yet, designing the success criteria and…
- no-ai-slop: Edit drafts into sharper, more human writing while preserving the writer's personal voice, or detect AI-slop patterns without rewriting. Use when the user wants a draft clearer, more direct, more opinionated, or less AI-sounding, or asks whether writing reads as AI.
- package-plugin: Use when a logical agent and its licensed skills must be packaged, renamed, installed, or validated as one dual-host agent plugin for Claude Code and Codex.

Descriptions come from the frontmatter of each SKILL.md, punctuation lightly normalized.