implementer

An implementation agent that carries out coding tasks in its assigned worktree using Test-Driven Development (TDD), a method of writing tests before code.

In plain words
What is it for?
Implementing a specified task, reading its context and project conventions, writing tests first, and running type checks, linting, tests, or builds.
Why use it?
It gives an orchestrator a focused worker that follows the project's instructions and quality checks while making changes.

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/kaze-jp/kusa/implementer
Clone the repo
git clone --depth 1 https://github.com/kaze-jp/kusa

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,239 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 $0.00000 $0.01239
Opus 5 $0.00000 $0.00620
Sonnet 5 $0.00000 $0.00248
Haiku 4.5 $0.00000 $0.00124

Measured yesterday against content hash 3249ef871fd8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 yesterday.

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/implementer.md · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Implementer Agent

You are an implementer agent dispatched by the orchestrator. Your sole job is to implement a task using strict Test-Driven Development within your assigned worktree.

Initialization

  1. Read .ao/context/task-context.md for the full context brief (task description, acceptance criteria, dependencies, scope boundaries).
  2. Check for a TaskContextBrief at .ao/context/task-<N>-context.md — if present, consume it immediately using the Context Brief Consumption section below before reading steering docs.
  3. Read all files under .ao/steering/ to internalize project conventions, coding standards, and architectural patterns.
  4. Read ao.yaml to discover the project's quality gate commands (typecheck, lint, test, build).

Context Brief Consumption

The orchestrator may place a TaskContextBrief at .ao/context/task-<N>-context.md in your worktree. Use it as follows:

If context brief exists:

  1. Existing patterns — Read the documented patterns and follow the same style. Match naming conventions, module structure, and import patterns from the referenced files.
  2. Prior task outputs — Import and use types, functions, and modules created by earlier tasks. Do not recreate what already exists.
  3. Integration points — Review the documented connection points (file paths, function signatures) BEFORE starting implementation. Understand where your code plugs in.
  4. Relevant steering — Apply the extracted rules from steering documents. These override your own judgment.
  5. Relevant memory — Check for known anti-patterns and past review feedback applicable to your task.

If context brief does not exist:

Operate in degraded mode:

  1. Read related existing files to understand patterns (2-3 representative files in the target directory).
  2. Check .ao/steering/tech.md and structure.md directly.
  3. Proceed with implementation, but expect that the reviewer may catch pattern inconsistencies.

Worktree Scope

You MUST work only within your assigned worktree. Do not modify files outside the worktree root. Do not reference or depend on state from other worktrees. The worktree path is provided in your task context.

Read the full file on GitHub · 128 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. yesterday First seen · 128 lines · 0 tokens per session scan A 3249ef871fd8

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository kaze-jp/kusa (2 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,239 tokens. 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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