What happens to my modified files during an update?

The skill detects customizations and uses semantic merging to keep them while applying upstream changes.

Can I preview changes before applying them?

Use the --check-only flag to see a dry-run report of all planned updates.

NotMyself/claude-win11-speckit-update-skill

Safely update SpecKit templates without losing customizations on Windows.

SkillsAgent Skills 31Open source

View on GitHub

Updated 2026-06-16

NotMyself/claude-win11-speckit-update-skill GitHub repository

What is NotMyself/claude-win11-speckit-update-skill?

NotMyself/claude-win11-speckit-update-skill is a specialized Claude Code extension that manages safe updates to SpecKit installations. It detects the current version automatically, performs section-level merges, and maintains a manifest of file changes to avoid overwriting personalized files.

The skill runs through conversational commands in Claude, offering dry-run checks, automatic backups, and rollback on errors. It supports both new installations and ongoing updates while integrating with existing SpecKit constitution commands.

It targets Windows 11 users running Claude Code via CLI or VSCode who need reliable SpecKit maintenance without manual intervention or destructive force updates.

What you can build with NotMyself/claude-win11-speckit-update-skill

First-time SpecKit setup

Run the updater in a fresh project and let it install the full SpecKit structure, commands, and tracking manifest automatically.

Regular template updates

Check for and apply the latest SpecKit changes while keeping your modified files intact through intelligent conflict handling.

Safe experimentation

Use dry-run mode to preview all changes before committing to an update, with full rollback available if needed.

Install NotMyself/claude-win11-speckit-update-skill

Install

/plugin install speckit-updater

Quick start

# Add the marketplace
/plugin marketplace add NotMyself/claude-plugins

# Install the skill
/plugin install speckit-updater

1Add the NotMyself plugin marketplace in Claude Code.
2Install the speckit-updater skill from the marketplace.
3Open a project folder in Claude and run /speckit-updater.
4Confirm installation or update when prompted by Claude.
5Review any generated diff files for remaining conflicts.