implement-feature

implement-feature is a skill for Claude Code from ezBuilder/code-brain. It costs 15 tokens per session (241 once invoked), scanned A, original, Apache-2.0.

A process for implementing a requested software feature with the smallest necessary change.

In plain words
What is it for?
It is for turning requirements into checkable goals, inspecting the current code, implementing the change, and running targeted verification.
Why use it?
It helps keep feature work focused by checking existing patterns, avoiding unnecessary dependencies, and adding only needed tests.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit It is for turning requirements into checkable goals, inspecting the current code, implementing the change, and running targeted verification.

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Install with agentmods
npx agentmods add skills/ezbuilder/code-brain/implement-feature
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.

Any agent
npx skills add ezBuilder/code-brain --skill implement-feature
Clone the repo
git clone --depth 1 https://github.com/ezBuilder/code-brain

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 implement-feature

README.md
[![agentmods](https://agentmods.dev/badge/skills/ezbuilder/code-brain/implement-feature/github.svg)](https://agentmods.dev/skills/ezbuilder/code-brain/implement-feature)
Your own site
<a href="https://agentmods.dev/skills/ezbuilder/code-brain/implement-feature"><img src="https://agentmods.dev/badge/skills/ezbuilder/code-brain/implement-feature/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.

agentmods 80×15 button for implement-feature

Your own site · 80×15
<a href="https://agentmods.dev/skills/ezbuilder/code-brain/implement-feature"><img src="https://agentmods.dev/badge/skills/ezbuilder/code-brain/implement-feature.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 241 The whole file, excluding the scripts and references it only reads on demand.
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.
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 5.1 $0.00015 $0.00241
Opus 5.5 $0.00006 $0.00096
Sonnet 5.5 $0.00003 $0.00048
Haiku 4.5 $0.00002 $0.00024

Measured 1mo ago against content hash 213292606d52, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

implement-feature 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 1mo 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.

kits/global-agent-kit/.claude/skills/implement-feature/SKILL.md · 24 lines

What it actually says

기능 구현 절차:

  1. 요구사항을 검증 가능한 목표로 바꾼다.
  2. 기존 구현과 유사 패턴을 조사한다.
  3. public API, schema, UX 변경 여부를 확인한다.
  4. Code Brain이 설치된 프로젝트인지 확인하고, 있으면 검색/검증 경로에 활용한다.
  5. 무코드, 표준/플랫폼 기능, 이미 설치된 의존성, 한 줄 구현 순서로 먼저 줄인다.
  6. 필요한 테스트만 추가/수정한다.
  7. 좁은 검증부터 실행한다.
  8. 알려진 한계를 남기는 단순화는 cb-simplify: <ceiling>; revisit when <trigger>로 표시한다.
  9. 기존 동작 변경이 있으면 완료 보고에 명시한다.

금지:

  • 요청 없는 옵션/설정/확장성 추가
  • 새 dependency 추가
  • 단일 구현 abstraction/factory/wrapper 생성
  • 요청 없는 boilerplate/scaffold 추가
  • 무관한 코드 개선
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. 1mo ago First seen · 24 lines · 15 tokens per session scan A 213292606d52

Subscribe to this mod's changes

implement-feature is a skill published in the GitHub repository ezBuilder/code-brain (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 15 tokens to every session and 241 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-30.