What is building-agents?

A reference and authoring tool for designing prompts for AI agents built with Claude, GPT, or Gemini APIs. It also helps create project instruction files such as CLAUDE.md and AGENTS.md.

Use it to improve agent prompts and write project rules that guide coding agents working in a repository.

It helps keep an agent's instructions consistent and makes prompt design easier to manage across AI systems.

building-agents — Plugin for Claude Code by shaharsha/claude-skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/shaharsha/claude-skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/shaharsha/claude-skills/building-agents/github.svg)](https://agentmods.dev/plugins/shaharsha/claude-skills/building-agents)

Your own site

<a href="https://agentmods.dev/plugins/shaharsha/claude-skills/building-agents"><img src="https://agentmods.dev/badge/plugins/shaharsha/claude-skills/building-agents/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/shaharsha/claude-skills/building-agents"><img src="https://agentmods.dev/badge/plugins/shaharsha/claude-skills/building-agents.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 3 skills cost 653 tokens a session between them.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

building-agents scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json#building-agents · 11 lines

What it actually says

{
  "name": "building-agents",
  "description": "Expert prompt-engineering reference for AI agents on Claude, GPT, Gemini, Kimi, and Grok APIs, plus authoring CLAUDE.md / AGENTS.md project-instruction files",
  "source": "./",
  "strict": false,
  "skills": [
    "./skills/prompt-engineer",
    "./skills/writing-project-instructions",
    "./skills/reviving-sessions"
  ]
}

Contents

What it installs

The manifest is a name and a version. 3 skills travel with it, and installing the plugin installs all of them — 653 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

1 file beside marketplace.json#building-agents in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

marketplace.json 4.9 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago Changed 2e894d38348b
2mo ago First seen · 11 lines scan A c4fa4f30a2d6

Subscribe to this mod's changes

building-agents is a plugin published in the GitHub repository shaharsha/claude-skills (6 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Building agents Writing and docs

building-agents next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
building-agentsshaharsha/claude-skills	Plugin	6	today	MIT	A	—	Claude Code
humanizerblader/humanizer	Plugin	65k	10d ago	MIT	A	—	Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-official	Plugin	46k	yesterday	Apache-2.0	A	—	Claude Code
nextjsvercel/next.js	Plugin	143k	yesterday	MIT	A	—	Claude Code
themes-examplegoogle-gemini/gemini-cli	Plugin	109k	yesterday	Apache-2.0	A	—	Gemini CLI
knowledge-work-plugins marketplaceanthropics/knowledge-work-plugins	Plugin	35k	3d ago	Apache-2.0	A	—	Claude Code
code-modernizationanthropics/claude-plugins-official	Plugin	46k	yesterday	Apache-2.0	A	—	Claude Code