writing-dev-diary

writing-dev-diary is a skill for Claude Code, Codex from syou6162/agent-skills. It costs 47 tokens per session (2,947 once invoked), scanned A, original, MIT.

A controlled way to create or update development diary entries in esa, a team documentation service. It uses a fixed local YAML file and requires diary content to be organized with bullet points.

In plain words
What is it for?
Use it when creating or updating an esa development diary, including recording decisions, task progress, implementation details, and completion changes.
Why use it?
It helps update the correct diary entries while following access restrictions and keeping the work history complete and self-contained.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Claude Code.

Good fit Use it when creating or updating an esa development diary, including recording decisions, task progress, implementation details, and completion changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/syou6162/agent-skills/writing-dev-diary
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 syou6162/agent-skills --skill writing-dev-diary
Clone the repo
git clone --depth 1 https://github.com/syou6162/agent-skills

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 writing-dev-diary

README.md
[![agentmods](https://agentmods.dev/badge/skills/syou6162/agent-skills/writing-dev-diary/github.svg)](https://agentmods.dev/skills/syou6162/agent-skills/writing-dev-diary)
Your own site
<a href="https://agentmods.dev/skills/syou6162/agent-skills/writing-dev-diary"><img src="https://agentmods.dev/badge/skills/syou6162/agent-skills/writing-dev-diary/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 writing-dev-diary

Your own site · 80×15
<a href="https://agentmods.dev/skills/syou6162/agent-skills/writing-dev-diary"><img src="https://agentmods.dev/badge/skills/syou6162/agent-skills/writing-dev-diary.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,947 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 $0.00047 $0.02947
Opus 5 $0.00023 $0.01473
Sonnet 5 $0.00009 $0.00589
Haiku 4.5 $0.00005 $0.00295

Measured 9d ago against content hash 8479486315b2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

writing-dev-diary 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 9d 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.

skills/writing-dev-diary/SKILL.md · 256 lines

How it starts

The opening of the file, as written. The whole thing — 256 lines — stays where its author put it; the contents beside it link to each section on GitHub.

esa開発日誌の作成・更新

esaに開発日誌を投稿・更新するスキルです。esa-llm-scoped-guard CLIを使用して、許可されたカテゴリ配下の記事のみを安全に編集します。

禁止事項

  • YAMLファイルは必ず.claude_work/dev_diary.yamlに作成すること(ファイル名固定
  • esa MCPのツール(create_esa_post, update_esa_post, read_esa_post, read_esa_multiple_posts, search_esa_posts)は使用禁止。既存記事の取得には必ず esa-llm-scoped-guard fetch コマンドを使用すること
  • サブエージェントへの指示: Plan modeでサブエージェントや探索用エージェントを起動して開発日誌を確認させる場合、必ず esa-llm-scoped-guard fetch で取得した .claude_work/dev_diary.yaml を参照するよう指示すること。esa MCPツールで直接取得させてはいけない
  • YAMLスキーマは必ずesa-llm-scoped-guard -helpで確認してから生成すること
  • Planモードでも投稿可能: .claude_work/.gitignore の対象であり、リポジトリの変更にならないため、Planモードでも書き込みが許可されている。esa-llm-scoped-guard コマンドの実行も同様。「Planモードだからできない」と拒否してはいけない

出力品質ルール

  • 箇条書きによる構造化を必ず行うこと: 長い文章の羅列は禁止。情報は必ず箇条書き(ネストも活用)で構造化する
  • 内容を省略・要約しないこと: ユーザーが提供した情報や調査結果をbodyに記載する際は省略せず、完全な形で記載する。「キーメッセージ」「要点のみ」への圧縮は禁止。ただし、タスクのdescriptionフィールドの更新(スコープ追記等)はこのルールの対象外
  • 開発日誌に直接書くこと: 別ファイル(summary.md等)に書き出さず、開発日誌のbodyに直接記載する
  • タスクのstatus変更時は整理も行うこと: タスクが完了・削除された場合、開発日誌の記載も見やすく整理し直す
  • self-containedにすること: 開発日誌だけを読めば作業の全体像・背景・決定事項が把握できるようにする。外部の会話コンテキストに依存しない記述を心がける
  • コード関連の記載はコードフェンスで囲むこと: ファイル名、関数名、コマンド、エラーメッセージなどコード関連の内容は、インラインコード(`xxx`)またはコードブロック(```)で囲む

良い例(箇条書き・ネスト活用・情報完全):

tasks:
  - description: BigQueryクエリ最適化
    status: completed
    details:
      背景: 月次集計クエリが30分以上かかっている
      アプローチ:
        - パーティションプルーニングの適用
        - 不要カラムの除外(SELECT * → 必要カラムのみ)
        - マテリアライズドビューの検討
      結果: 実行時間を30分→5分に短縮

悪い例(構造化不足・省略):

BigQueryクエリを最適化した。パーティションプルーニングの適用と不要カラムの除外により、月次集計クエリの実行時間を改善した。マテリアライズドビューも検討した。

使用タイミング

以下のトリガーワードで発動します:

  • 「開発日誌を作って」: 新規作成
  • 「開発日誌を更新」+ esaのURL: 指定されたURLの記事を更新
  • 「開発日誌を更新」(URLなし): ユーザーに開発日誌のURLを確認

実行手順

手順1: YAMLスキーマを確認

最初に必ず最新のYAMLスキーマを確認してください:

esa-llm-scoped-guard -help

手順2: トリガーによる条件分岐

Read the full file on GitHub · 256 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. 9d ago First seen · 256 lines · 47 tokens per session scan A 8479486315b2

Subscribe to this mod's changes

writing-dev-diary is a skill published in the GitHub repository syou6162/agent-skills (11 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 2,947 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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