api-service-planning

api-service-planning is a skill for Claude Code, Codex from masayan1126/masayan-uni-code-plugins. It costs 40 tokens per session (834 once invoked), scanned A, original, MIT.

An API service planning skill for designing a backend service that other software can use through defined requests and responses.

In plain words
What is it for?
Use it to brainstorm API services, define REST, GraphQL, or gRPC endpoints, plan authentication and traffic limits, design deployment, and create a project roadmap.
Why use it?
It turns an early idea into a concrete plan covering the API shape, system structure, infrastructure, security, scaling, and delivery steps.

Skill for Claude CodeCodex

Part of the project-planner plugin — 5 skills, 5 commands shipped together

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/masayan1126/masayan-uni-code-plugins/api-service-planning
Any agent
npx skills add masayan1126/masayan-uni-code-plugins --skill api-service-planning
Clone the repo
git clone --depth 1 https://github.com/masayan1126/masayan-uni-code-plugins

Made for: Claude Code, Codex.

Or install project-planner, the plugin that ships this one along with the rest of its 5 skills, 5 commands.

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 api-service-planning

README.md
[![agentmods](https://agentmods.dev/badge/skills/masayan1126/masayan-uni-code-plugins/api-service-planning.svg)](https://agentmods.dev/skills/masayan1126/masayan-uni-code-plugins/api-service-planning)
Your own site
<a href="https://agentmods.dev/skills/masayan1126/masayan-uni-code-plugins/api-service-planning"><img src="https://agentmods.dev/badge/skills/masayan1126/masayan-uni-code-plugins/api-service-planning.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 834 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 $0.00834
Opus 5 $0.00020 $0.00417
Sonnet 5 $0.00008 $0.00167
Haiku 4.5 $0.00004 $0.00083

Measured 3d ago against content hash e1cea12745f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-service-planning 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 3d 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/project-planner/skills/api-service-planning/SKILL.md · 75 lines

What it actually says

APIサービス企画スキル

あなたは、バックエンドAPIサービスの企画を専門とするアーキテクトです。新しいAPIサービスのアイデアをゼロから企画し、API設計、アーキテクチャ設計、インフラ設計まで包括的にサポートします。

目的

  • 実現可能なAPIサービスのアイデアを創出する
  • 利用者(開発者/システム)のニーズを分析する
  • API設計(REST/GraphQL/gRPC)を行う
  • 適切なアーキテクチャとスケーリング戦略を設計する
  • インフラ・デプロイ戦略を策定する

スキル構成

このスキルは以下のファイルで構成されています:

  • SKILL.md (このファイル): スキルの概要と基本情報
  • WORKFLOW.md: 詳細な実行手順
  • TEMPLATES.md: 企画書のフォーマットテンプレート
  • BEST_PRACTICES.md: ベストプラクティスと実行例

クイックスタート

基本的な使い方

  1. ユーザーからAPIサービスアイデアをヒアリング
  2. アイデアブレインストーミング(3〜5パターン提案)
  3. 類似APIの調査(WebSearchツール活用)
  4. API設計(エンドポイント、スキーマ)
  5. アーキテクチャ・インフラ設計
  6. 開発ロードマップ作成
  7. 企画書をapi-service-plans/に保存
  8. 次のステップを提案

必要な情報

必須項目
  • サービスのテーマ・分野: どのような領域のAPIか
  • 提供する機能: どんな機能を外部に提供するか
  • 利用者: 誰が(どのシステムが)APIを利用するか
  • 想定リクエスト量: 初期・将来の規模感
オプション項目
  • API形式(REST/GraphQL/gRPC)
  • 認証要件(API Key/OAuth/JWT)
  • SLA要件(可用性、レスポンスタイム)
  • 既存システムとの連携

詳細な実行手順は WORKFLOW.md を参照してください。

企画書の保存先

企画書はapi-service-plans/[service-name].mdに保存されます。 詳細なフォーマットは TEMPLATES.md を参照してください。

ベストプラクティス

  • API設計: RESTful原則、適切なHTTPステータスコード
  • セキュリティ: 認証・認可、レート制限、入力検証
  • スケーラビリティ: 水平スケーリング、キャッシュ戦略
  • ドキュメント: OpenAPI/Swagger仕様書

詳細は BEST_PRACTICES.md を参照してください。


それでは、APIサービスのアイデアや企画したい内容を教えてください。

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 75 lines · 40 tokens per session scan A e1cea12745f5

Subscribe to this mod's changes

api-service-planning is a skill published in the GitHub repository masayan1126/masayan-uni-code-plugins (5 stars, last pushed 5mo ago), licensed MIT. It adds 40 tokens to every session and 834 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 2026-08-31.

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