# Git Performance Issue Investigator

> When the user needs to investigate performance issues in a Git repository by finding specific code changes, identifying responsible commits, and contacting authors. This skill is triggered by requests involving finding commits containing specific variables or code patterns, identifying earliest/introducing commits, extracting author information (name, email), and communicating about performance issues. It provides capabilities for searching Git history for specific code patterns using git log -S, retrieving full commit details with git show, extracting author metadata, and generating formatted communications using templates.

- Skill: `majiayu000/git-performance-issue-investigator` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/git-performance-issue-investigator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/git-performance-issue-investigator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/git-performance-issue-investigator

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# Instructions

## Overview
This skill investigates performance issues in Git repositories by tracing code changes to specific commits, identifying responsible authors, and generating communications.

## Core Workflow

### 1. Initialize Investigation
- Identify the target Git repository path in the workspace
- Confirm the specific code pattern or variable name to search for (e.g., `remove_caching_layer`)
- Locate any communication templates in the workspace (e.g., `template.txt`)

### 2. Find Introducing Commit
Use `git log` with the `-S` flag to search for the earliest commit containing the specified code pattern: