implement-feature

implement-feature is a skill for Claude Code, Codex from DGouron/review-flow. It costs 40 tokens per session (1,269 once invoked), scanned A, original, MIT.

An orchestrated workflow for turning a feature specification into tested code that follows Clean Architecture, a way of separating business rules from technical details.

In plain words
What is it for?
Use it with a written specification, GitHub issue, or feature description when planning and implementing a complete feature.
Why use it?
It divides planning and implementation into dedicated stages and uses tests to check the result against the specification.

Skill for Claude CodeCodex

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 skills/dgouron/review-flow/implement-feature
Any agent
npx skills add DGouron/review-flow --skill implement-feature
Clone the repo
git clone --depth 1 https://github.com/DGouron/review-flow

Made for: Claude Code, Codex.

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/dgouron/review-flow/implement-feature.svg)](https://agentmods.dev/skills/dgouron/review-flow/implement-feature)
Your own site
<a href="https://agentmods.dev/skills/dgouron/review-flow/implement-feature"><img src="https://agentmods.dev/badge/skills/dgouron/review-flow/implement-feature.svg" alt="Measured on agentmods" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,269 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 $0.00040 $0.01269
Opus 5 $0.00020 $0.00634
Sonnet 5 $0.00008 $0.00254
Haiku 4.5 $0.00004 $0.00127

Measured 4d ago against content hash 1f7dc9bd49d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 4d 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/skills/implement-feature/SKILL.md · 178 lines

How it starts

The opening of the file, as written. The whole thing — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Implement Feature — Spec-Driven Orchestrator

Role

You are the orchestrator of a spec-driven pipeline. You coordinate two specialized agents to transform a spec into tested, functional, Clean Architecture-compliant code.

You do NOT code yourself. You coordinate, present, and validate with the user.

Agents

Agent Role Skills preloaded
feature-planner Analyzes the spec, produces a structured plan clean-architecture
feature-implementer Implements with TDD, self-review, fix loop tdd, clean-architecture

Input

The user provides either:

  • A path to a spec: /implement-feature docs/specs/my-feature.md
  • A GitHub issue: /implement-feature #42
  • An inline description: /implement-feature "As a reviewer, I want to cancel a pending review"

If it's an inline description, suggest that /product-manager can produce a complete Gherkin spec and offer to use it first.


Workflow

Step 1: LOAD THE SPEC

  1. If path provided → read the file
  2. If GitHub issue → fetch with gh issue view
  3. If inline description → structure into acceptance criteria
  4. Display the spec to the user for confirmation

Step 2: PLAN

Delegate to the feature-planner agent:

  • Pass the complete spec
  • The agent has clean-architecture preloaded — it already knows the patterns
  • It reads a reference module and shared foundations
  • It returns a structured plan

Present the plan to the user:

Implementation Plan

Scope: [feature name]
Files to create: [count]

ENTITY LAYER:
  - src/entities/[domain]/[domain].ts
  - src/entities/[domain]/[domain].schema.ts
  - src/entities/[domain]/[domain].guard.ts
  - src/entities/[domain]/[domain].gateway.ts

USE CASE LAYER:
  - src/usecases/[context]/[action].usecase.ts

INTERFACE ADAPTERS:
  - src/interface-adapters/controllers/[type]/[feature].controller.ts
  - src/interface-adapters/gateways/[transport]/[domain].[platform].gateway.ts
  - src/interface-adapters/presenters/[feature].presenter.ts (if applicable)
  - src/interface-adapters/views/[feature]/ (if applicable)

WIRING:
  - src/main/routes.ts (additions)

TESTS:
  - src/tests/units/...
  - src/tests/factories/[domain].factory.ts
  - src/tests/stubs/[domain].stub.ts

Validate this plan?

Read the full file on GitHub · 178 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. 4d ago First seen · 178 lines · 40 tokens per session scan A 1f7dc9bd49d9

Subscribe to this mod's changes

implement-feature is a skill published in the GitHub repository DGouron/review-flow (42 stars, last pushed today), licensed MIT. It adds 40 tokens to every session and 1,269 once invoked, about $0.0002 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 2026-08-30.

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