Slash Command

Snapshot Manager

Manage snapshot tests with intelligent diff analysis and updates

Type: Slash Command
Repository: jeremylongshore/tons-of-skills-marketplace
GitHub stars: 2.8k
License: MIT
Repo last updated: Sep 27, 2026
Source file: plugins/testing/snapshot-test-manager/commands/snapshot-manager.md

What Snapshot Manager is

Snapshot Manager is a slash command published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”

A slash command is a reusable prompt saved as a markdown file and run by typing its name after a slash. In Claude Code, custom commands have been merged into skills: a file in .claude/commands/ and a skill folder in .claude/skills/ both create the same kind of command, and existing command files keep working.

Snapshot Manager gives you a repeatable way to run the same instructions without retyping them, optionally with arguments.

How to install Snapshot Manager

Claude Code

Download snapshot-manager.md from the repository.
Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md.
Run it by typing / followed by its name.

Claude Cowork

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it.
In Customize → Skills, click +, then upload the ZIP.
Run it from any task with / and the skill name.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/testing/snapshot-test-manager/commands/snapshot-manager.md, shared under the repository's MIT license. Read the full file on GitHub.

Manage and update snapshot tests across your codebase with intelligent diff analysis, selective updates, and snapshot validation.

What You Do

Analyze Snapshot Failures

Review failed snapshot diffs
Identify intentional vs unintentional changes
Show side-by-side comparisons

Selective Updates

Update specific snapshots that represent intentional changes
Preserve snapshots that represent regressions
Batch update related snapshots

Snapshot Validation

Verify snapshot content is meaningful
Detect overly broad or brittle snapshots
Suggest snapshot improvements

Snapshot Organization

Organize snapshots by feature/component
Clean up orphaned snapshots
Generate snapshot documentation

Usage Pattern

When invoked, you should:

Identify the test framework (Jest, Vitest, etc.)
Locate snapshot files and failed tests
Analyze diffs to determine if changes are intentional
Provide clear recommendations for updates
Execute selective snapshot updates
Validate updated snapshots still test meaningful behavior

Output Format

## Snapshot Analysis Report

### Failed Snapshots: [N]

#### Component: [Name]
**File:** `__snapshots__/[file].snap`
**Status:** [Intentional Change / Potential Regression]

**Diff Summary:**
- Changed: [description]
- Impact: [assessment]

**Recommendation:** [Update / Review / Reject]

### Actions Taken
- Updated [N] snapshots
- Preserved [N] snapshots for review
- Cleaned [N] orphaned snapshots
…

Framework Support

Jest snapshot testing
Vitest snapshots
React Testing Library snapshots
Playwright snapshots
Storybook visual regression

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Snapshot Manager?

Snapshot Manager is a slash command for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Manage snapshot tests with intelligent diff analysis and updates

How do I install Snapshot Manager in Claude Code?

Download snapshot-manager.md from the repository. Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md. Run it by typing / followed by its name.

Can I use Snapshot Manager in Claude Cowork?

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it. In Customize → Skills, click +, then upload the ZIP. Run it from any task with / and the skill name.

Is Snapshot Manager safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.