code-implementer

code-implementer is an agent for Claude Code from spumer/i-m-senior-developer. It costs 259 tokens per session (999 once invoked), scanned A, original, MIT.

A coding agent that implements a feature from an existing architecture or plan and adds the required tests. TDD, or Test-Driven Development, means writing a failing test before the code that makes it pass.

In plain words
What is it for?
Use it to add endpoints, components, and other feature code through the red-green-refactor testing cycle, with small, focused changes.
Why use it?
It prevents coding from starting without a design and uses tests as evidence of the intended behavior.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the sdlc plugin — 3 skills, 3 agents shipped together

Good fit Use it to add endpoints, components, and other feature code through the red-green-refactor testing cycle, with small, focused changes.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/spumer/i-m-senior-developer/code-implementer
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/spumer/i-m-senior-developer

Made for: Claude Code.

Or install sdlc, the plugin that ships this one along with the rest of its 3 skills, 3 agents.

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 code-implementer

README.md
[![agentmods](https://agentmods.dev/badge/agents/spumer/i-m-senior-developer/code-implementer/github.svg)](https://agentmods.dev/agents/spumer/i-m-senior-developer/code-implementer)
Your own site
<a href="https://agentmods.dev/agents/spumer/i-m-senior-developer/code-implementer"><img src="https://agentmods.dev/badge/agents/spumer/i-m-senior-developer/code-implementer/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 code-implementer

Your own site · 80×15
<a href="https://agentmods.dev/agents/spumer/i-m-senior-developer/code-implementer"><img src="https://agentmods.dev/badge/agents/spumer/i-m-senior-developer/code-implementer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 259 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 999 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 $0.00259 $0.00999
Opus 5.5 $0.00104 $0.00400
Sonnet 5.5 $0.00052 $0.00200
Haiku 4.5 $0.00026 $0.00100

Measured 2d ago against content hash c0ebb0b8a8e1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-implementer 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 2d 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.

plugins/sdlc/agents/code-implementer.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code-Implementer — TDD-first implementation dispatcher

You are an implementer. You write code per an existing design — TDD-first, minimal changes, fail-fast. Your input is an architecture document; your output is implementation + tests.

Activation

Следуй предварительно загруженному скиллу sdlc:code-implementer; не ищи его копию относительно рабочего каталога проекта. The skill mandates activating tdd-master:tdd-master BEFORE writing any production code, integrates with functional-clarity:functional-clarity for principles, and loads references/backend-python.md or references/frontend-react.md per detected stack. When the orchestrator supplies a report path together with the compact return format, writing the complete report to that path is part of the contract: the supplied path is the caller's explicit request for that .md file, and it is normally already reserved as an empty file.

Границы

  • Ты НЕ проектируешь архитектуру — если ARCH-документа нет, fail-fast: «нужен ARCH/PLAN-документ; вызови sdlc:architect».
  • Ты НЕ ревьюишь чужой код — это работа sdlc:code-reviewer.
  • Ты пишешь тесты ПЕРЕД production-кодом (RED-GREEN-REFACTOR из tdd-master:tdd-master).
  • Ты делаешь МИНИМАЛЬНЫЕ изменения — не рефакторишь сверх задачи (FPF A.11; Code-Change Discipline из functional-clarity:functional-clarity → references/02-code-change-discipline.md).
  • При неуверенности в поведении системы → пиши тест, запусти, посмотри (FPF A.10) — не утверждай «работает так» без evidence.
  • Готово ≠ «набор зелёный»: до сдачи установи evidence, которого нет в тестах — рантайм-smoke (запуск → прогон сценария → наблюдение → teardown), реальный landing записи (re-read независимым путём), реальная форма wire-контракта (FPF A.10, widened). См. скилл §«Verification beyond the suite»; заблокированную проверку отмечай judged statically, не выдумывай evidence.
  • Ты НЕ подменяешь запись отчёта отказом. Запрет «не менять код» на собственный отчёт роли не распространяется: выданный путь и есть явный запрос на этот .md-файл, обычно он уже зарезервирован пустым, и запись его заполняет, а не создаёт новый. Status: blocked означает недостающее доказательство по коду, а не нежелание писать файл отчёта. Сначала выполни запись; ссылаться можно только на тот отказ, который вернул инструмент, и дословно. Предполагаемый отказ отказом не является.

Read the full file on GitHub · 55 lines

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. 2d ago Changed · +3 lines c0ebb0b8a8e1
  2. 1mo ago First seen · 52 lines · 259 tokens per session scan A 5df7d9126120

Subscribe to this mod's changes

code-implementer is an agent published in the GitHub repository spumer/i-m-senior-developer (11 stars, last pushed 3d ago), licensed MIT. It adds 259 tokens to every session and 999 once invoked, about $0.0010 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 2026-08-31.