Slash Command

Prompt Improve

Analyze and improve a plugin prompt, skill definition, or command instruction

Type: Slash Command
Repository: jeremylongshore/tons-of-skills-marketplace
GitHub stars: 2.8k
License: MIT
Repo last updated: Sep 27, 2026
Source file: plugins/security/severity1-marketplace/commands/prompt-improve.md

What Prompt Improve is

Prompt Improve 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.

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

How to install Prompt Improve

Claude Code

Download prompt-improve.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/security/severity1-marketplace/commands/prompt-improve.md, shared under the repository's MIT license. Read the full file on GitHub.

Analyze the current plugin's prompts, skill definitions, or command instructions and suggest improvements for clarity, safety, effectiveness, and best-practice adherence.

Analysis Dimensions

Clarity — Are instructions unambiguous and easy to follow?
Safety — Does the prompt avoid encouraging dangerous operations?
Effectiveness — Will the prompt reliably produce the intended result?
Completeness — Are edge cases and error scenarios addressed?
Conciseness — Is the prompt free of unnecessary verbosity?

Process

Read the target file (SKILL.md, command .md, or agent .md)
Score each dimension on a 1-5 scale
Identify specific improvement opportunities
Suggest concrete rewrites for weak sections
Validate that improvements preserve original intent

Output Format

## Prompt Analysis: [filename]

### Scores
| Dimension | Score | Notes |
|-----------|-------|-------|
| Clarity | X/5 | ... |
| Safety | X/5 | ... |
| Effectiveness | X/5 | ... |
| Completeness | X/5 | ... |
| Conciseness | X/5 | ... |

**Overall: X/25**

### Improvements
1. [Specific improvement with before/after]
2. [Specific improvement with before/after]

### Suggested Rewrite
…

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 Prompt Improve?

Prompt Improve is a slash command for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Analyze and improve a plugin prompt, skill definition, or command instruction

How do I install Prompt Improve in Claude Code?

Download prompt-improve.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 Prompt Improve 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 Prompt Improve 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.