# Erk Diff Analysis > Internal skill for commit message generation. Only load when explicitly requested by name or invoked by commands. Use when this capability is needed. - Skill: `tomevault-io/erk-diff-analysis` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/erk-diff-analysis` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/erk-diff-analysis/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/erk-diff-analysis --- # Diff Analysis This skill provides the commit message generation prompt used by PR submission commands. ## When to Use Only load this skill when: - Explicitly requested by name (`erk-diff-analysis`) - Invoked by commands like `/erk:git-pr-push` ## Usage Load `references/commit-message-prompt.md` when analyzing a diff, then apply its principles to generate output. ## Key Principles - Be concise and strategic - focus on significant changes - Use component-level descriptions - reference modules/components, not individual functions - Highlight breaking changes prominently - Note test coverage patterns - Use relative paths from repository root --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/dagster-io) — claim your Tome and manage your conversions.