A workflow that creates a detailed implementation plan in docs/specs/ based on the selected architecture and earlier development decisions.

Use it after architecture selection to read the workflow context, create the specifications directory, write the plan, and update the workflow state.

It turns design decisions into an ordered plan before coding begins. This makes the work easier to split into concrete implementation steps.

dev:plan — Skill for Claude Code by atournayre

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 atournayre/claude-marketplace --skill plan

Clone the repo

git clone --depth 1 https://github.com/atournayre/claude-marketplace

Made for: Claude Code.

Or install dev, the plugin that ships this one along with the rest of its 25 skills, 8 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/atournayre/claude-marketplace/plan/github.svg)](https://agentmods.dev/skills/atournayre/claude-marketplace/plan)

Your own site

<a href="https://agentmods.dev/skills/atournayre/claude-marketplace/plan"><img src="https://agentmods.dev/badge/skills/atournayre/claude-marketplace/plan/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/atournayre/claude-marketplace/plan"><img src="https://agentmods.dev/badge/skills/atournayre/claude-marketplace/plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 867 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.

Model	Per session	Once invoked
Fable 5.1	$0.00023	$0.00867
Opus 5	$0.00012	$0.00434
Sonnet 5	$0.00005	$0.00173
Haiku 4.5	$0.00002	$0.00087

Measured 12d ago against content hash 752978055b33, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

dev:plan 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 12d 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.

dev/skills/plan/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Objectif

Phase 4 du workflow de développement : générer un plan d'implémentation détaillé basé sur l'architecture choisie.

Instructions

Instructions à Exécuter

IMPORTANT : Exécute ce workflow étape par étape :

1. Créer les tâches de planification

Utiliser TaskCreate pour chaque étape :

TaskCreate #1: Lire le contexte du workflow
TaskCreate #2: Créer le répertoire docs/specs
TaskCreate #3: Générer le plan d'implémentation
TaskCreate #4: Afficher le résumé
TaskCreate #5: Mettre à jour le workflow state

Important :

Utiliser activeForm (ex: "Lisant le contexte", "Générant le plan")
Chaque tâche doit être marquée in_progress puis completed

Pattern d'exécution pour chaque étape :

TaskUpdate → tâche en in_progress
Exécuter l'étape
TaskUpdate → tâche en completed

2. Lire le contexte

🔄 Progression : TaskUpdate → tâche #1 en in_progress

Lire .claude/data/.dev-workflow-state.json pour récupérer :
- La feature description
- Les décisions de clarification
- L'architecture choisie
Si phases précédentes non complétées, rediriger vers la phase manquante

🔄 Progression : TaskUpdate → tâche #1 en completed

3. Créer le répertoire si nécessaire

🔄 Progression : TaskUpdate → tâche #2 en in_progress

mkdir -p docs/specs

🔄 Progression : TaskUpdate → tâche #2 en completed

4. Générer le plan

🔄 Progression : TaskUpdate → tâche #3 en in_progress

Créer le fichier docs/specs/feature-{nom-kebab-case}.md avec la structure complète du plan

🔄 Progression : TaskUpdate → tâche #3 en completed

5. Afficher le résumé

🔄 Progression : TaskUpdate → tâche #4 en in_progress

Présenter le plan généré.

🔄 Progression : TaskUpdate → tâche #4 en completed

6. Mettre à jour le workflow state

🔄 Progression : TaskUpdate → tâche #5 en in_progress

Mettre à jour .claude/data/.dev-workflow-state.json

🔄 Progression : TaskUpdate → tâche #5 en completed

Read the full file on GitHub · 112 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.

12d ago First seen · 112 lines · 23 tokens per session scan A 752978055b33

Subscribe to this mod's changes

dev:plan is a skill published in the GitHub repository atournayre/claude-marketplace (9 stars, last pushed 6mo ago), licensed MIT. It adds 23 tokens to every session and 867 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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