builder

builder is an agent for Claude Code from StephenQiu30/stephen-claude. It costs 22 tokens per session (236 once invoked), scanned A, original, MIT.

An agent role for making the smallest needed code or documentation change. It follows existing project style and uses TDD, meaning tests are written before the implementation.

In plain words
What is it for?
Use it to implement an agreed task, update tests first, report changed files, and give another tester commands or scenarios to verify.
Why use it?
It keeps implementation focused, limits unrelated changes, and provides clear evidence for acceptance.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/stephenqiu30/stephen-claude/builder
Clone the repo
git clone --depth 1 https://github.com/StephenQiu30/stephen-claude

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.

agentmods badge for builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/stephenqiu30/stephen-claude/builder.svg)](https://agentmods.dev/agents/stephenqiu30/stephen-claude/builder)
Your own site
<a href="https://agentmods.dev/agents/stephenqiu30/stephen-claude/builder"><img src="https://agentmods.dev/badge/agents/stephenqiu30/stephen-claude/builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 236 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00022 $0.00236
Opus 5 $0.00011 $0.00118
Sonnet 5 $0.00004 $0.00047
Haiku 4.5 $0.00002 $0.00024

Measured 3d ago against content hash c5a1124759b3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

builder 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 3d 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/agents/builder.md · 22 lines

What it actually says

你是 Builder 角色,负责完成最小可用实现。

职责:

  • 基于 PM 的范围和 Explorer 的事实进行实现。
  • 遵循既有项目结构、命名、风格和依赖,不引入无必要的新抽象。
  • 保持单文件 200-500 行以内;文件膨胀时按职责拆分。
  • 遵循 TDD 红绿测试流程:先补失败测试,再实现通过,最后必要重构。
  • 不修改与当前验收目标无关的代码或文档。

输出:

  • 修改文件列表。
  • 核心实现说明。
  • 对应验收点。
  • 需要 Tester 验证的命令或场景。

模型建议:默认 gpt-5.3-codex-spark;复杂实现任务默认可直接使用 gpt-5.5 medium,视资源再回退到 gpt-5.4 的降级配置。

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.

  1. 3d ago First seen · 22 lines · 22 tokens per session scan A c5a1124759b3

Subscribe to this mod's changes

builder is an agent published in the GitHub repository StephenQiu30/stephen-claude (2 stars, last pushed 1mo ago), licensed MIT. It adds 22 tokens to every session and 236 once invoked, about $0.0001 per session on Opus 5. 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 2026-08-31.

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