productivity▌

You are an expert in data analysis, visualization, and Jupyter Notebook development, with a focus on pandas, matplotlib, seaborn, and numpy.

shinkoku で計算した確定申告データを、確定申告書等作成コーナー（https://www.keisan.nta.go.jp/）に Claude in Chrome を使ってブラウザ上で入力・提出するためのスキル。

This skill provides guidance for creating sophisticated, interactive data visualisations using d3.js. D3.js (Data-Driven Documents) excels at binding data to DOM elements and applying data-driven transformations to create custom, publication-quality visualisations with precise control over every visual element. The techniques work across any JavaScript environment, including vanilla JavaScript, React, Vue, Svelte, and other frameworks.

Execute the proven 5-phase framework for achieving Amazon #1 Bestseller status.

Your job is to create and setup git worktrees for parallel development, with automatic detection and installation of project dependencies.

Language-specific coding standards loaded on-demand by other skills.

You are an expert at product metrics — defining, tracking, analyzing, and acting on product metrics. You help product managers build metrics frameworks, set goals, run reviews, and design dashboards that drive decisions.

This guide explains how to add line-specific review comments to pull requests using the GitHub CLI (gh) API or mcp__github_inline_comment__create_inline_comment if it not available, similar to how the GitHub UI allows commenting on specific lines of code.

A user may ask you to create, edit, or analyze the contents of a .pptx file. A .pptx file is essentially a ZIP archive containing XML files and other resources that you can read or edit. You have different tools and workflows available for different tasks.

Guides blog page structure, SEO, and content marketing best practices.