Codex Fable5
baskduf/FableCodex
Apply a Claude Fable 5 inspired operating style inside Codex.
Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness.
Install Prompt Improver
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improver --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/prompt-improver .claude/skills/prompt-improver && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .claude/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improverType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improver --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/.curated/prompt-improver .agents/skills/prompt-improver && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .agents/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improver --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/.curated/prompt-improver .cursor/skills/prompt-improver && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .cursor/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/jeremylongshore/tons-of-skills-marketplace.git --path skills/.curated/prompt-improver--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improver --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/.curated/prompt-improver .gemini/skills/prompt-improver && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .gemini/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improverInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/.curated/prompt-improver .github/skills/prompt-improver && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .github/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace prompt-improver --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/.curated/prompt-improver .opencode/skills/prompt-improver && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "prompt-improver" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/.curated/prompt-improver into .opencode/skills/prompt-improver/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prompt-improver", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
prompt-improver- GitHub stars
- 2.8k
- Token cost
- ~1.2k tokens
- SKILL.md length
- 392 words
- Files
- 2 (incl. references)
- Skills in repo
- 3,342
- Repo updated
- First seen
- Licence
- MIT
At a glance
Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness.
- Works in 6 steps: Identify the target — Locate the… → Read the content — Use Read tool to get… → Score each dimension on a 1-5 scale → …
- The user asks to improve a prompt
- SKILL.md covers Overview, When to Use This Skill, Instructions and Output Format, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Prompt Improver is an agent skill from jeremylongshore/tons-of-skills-marketplace. Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness. Use when the user asks to "improve a prompt", "review a skill", "enhance instructions", "make this prompt better", "optimize this command", or "audit prompt quality".
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/severity-levels.md`). Compatibility notes: Designed for Claude Code
It sits in AI & LLM Engineering, covering Prompt engineering. 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. The licence is MIT.
When your agent uses it
- The user asks to improve a prompt
- Enhance instructions
- Make this prompt better
- Optimize this command
Example prompts
- “improve a prompt”
- “review a skill”
- “enhance instructions”
- “/prompt-improver”
Requirements
- Compatibility (from SKILL.md): Designed for Claude Code
- Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Identify the target — Locate the SKILL.md, command, or agent file to analyze
- Read the content — Use Read tool to get the full file contents
- Score each dimension on a 1-5 scale
- Identify improvements — List specific weaknesses with line references
- Generate rewrites — Provide improved versions preserving original intent
- Apply changes — If requested, use Edit tool to apply improvements
What it can do on your machine
Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteEditGlobGrep
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are yaml and markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
code.claude.complatform.claude.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Compatibility
Designed for Claude Code
From compatibility in the SKILL.md frontmatter.
Context cost
Prompt Improver loads about 1.2k tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 76 tokens; SKILL.md has 392 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 392 words, ~1,171 tokens.
Download SKILL.mdSave it as
.claude/skills/prompt-improver/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- prompt-improver
- description
- Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness. Use when the user asks to "improve a prompt", "review a skill", "enhance instructions", "make this prompt better", "optimize this command", or "audit prompt quality".
- allowed-tools
- Read, Write, Edit, Glob, Grep
- compatibility
- Designed for Claude Code
- version
- 1.7.0
- author
- severity1 <severity1@intentsolutions.io>
- license
- MIT
- tags
- security, compliance
Prompt Improver
This skill automatically analyzes and improves plugin prompts, SKILL.md files, command definitions, and agent instructions.
Overview
The prompt-improver skill evaluates plugin content across five dimensions — clarity, safety, effectiveness, completeness, and conciseness — then provides scored assessments and concrete rewrites.
When to Use This Skill
This skill activates when you need to:
- Review and improve a SKILL.md file's instructions
- Enhance command or agent markdown definitions
- Audit prompt quality across a plugin
- Optimize instructions for better Claude performance
- Ensure prompts follow marketplace best practices
Instructions
- Identify the target — Locate the SKILL.md, command, or agent file to analyze
- Read the content — Use Read tool to get the full file contents
- Score each dimension on a 1-5 scale:
- Clarity (1-5): Are instructions unambiguous?
- Safety (1-5): Does it avoid encouraging dangerous operations?
- Effectiveness (1-5): Will it reliably produce intended results?
- Completeness (1-5): Are edge cases addressed?
- Conciseness (1-5): Is it free of unnecessary verbosity?
- Identify improvements — List specific weaknesses with line references
- Generate rewrites — Provide improved versions preserving original intent
- Apply changes — If requested, use Edit tool to apply improvements
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]
### Suggested Rewrite
[Full improved prompt text]Best Practices
- Preserve the original author's intent and style
- Prioritize safety improvements over stylistic ones
- Keep suggestions actionable and specific
- Reference marketplace conventions from CLAUDE.md
- Validate frontmatter fields match the 2026 spec
Examples
Example 1: Improving a vague skill description
Before:
description: Does stuff with codeAfter:
description: |
Analyze source code for common anti-patterns and suggest refactoring improvements. Use when the user asks to "review code quality", "find code smells", or "refactor this file".Example 2: Adding missing safety guidance
Before:
Delete all temporary files from the project.After:
Identify temporary files (*.tmp, *.bak, *.swp) in the project. List them for user confirmation before deletion. Never delete files outside the project root.Show full SKILL.md (158 more words)Show less
Prerequisites
- A plugin directory containing at least one SKILL.md, command, or agent markdown file
- Read access to the target plugin's
.claude-plugin/plugin.jsonfor context - Familiarity with the 2026 SKILL.md frontmatter spec
Output
The skill produces a structured analysis report containing:
- Score card: 5 dimensions rated 1-5 with notes and an overall score out of 25
- Improvement list: Specific weaknesses with file paths and line references
- Suggested rewrite: Full improved prompt text preserving original intent
Error Handling
| Error | Cause | Resolution |
|---|---|---|
| No SKILL.md found | Target path has no skill files | Verify the plugin path and check for skills/*/SKILL.md |
| Invalid frontmatter | YAML parsing failure in target file | Report the specific YAML error and suggest corrections |
| Empty skill body | File has frontmatter but no instructions | Flag as critical and generate a starter template |
Resources
- Claude Code plugins documentation — official plugin and SKILL.md spec
- Prompt engineering guide — Anthropic best practices for prompt design
- Marketplace conventions: see the repository CLAUDE.md for field requirements and structure
© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/.curated/prompt-improver of jeremylongshore/tons-of-skills-marketplace.
- SKILL.md
- references/severity-levels.md
Open the folder on GitHubat commit cfae287
Compare with similar skills
Prompt Improver next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Prompt Improver this skilljeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.2k | Automated safety check: Pass | MIT | |
| Codex Fable5baskduf/FableCodex | 437 | — | ~1.6k | Automated safety check: Pass | AGPL-3.0 | |
| Prompt Template Authoringnicobailon/pi-prompt-template-model | 321 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Context Auditundefined-ui/second-brain-os | 1k | — | ~802 | Automated safety check: Pass | MIT | |
| Asd Ste100 SkillTwiTech-LAB/devchain | 101 | — | ~1.2k | Automated safety check: Pass | MIT | |
| AI Chatwindmill-labs/windmill | 18k | — | ~672 | Automated safety check: Pass | Custom licence |
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AI Chat
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Guidance for improving the Windmill AI chat (copilot), especially global mode — tools, prompts, and context-window discipline.
Creating Kiro Agents
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Questions about Prompt Improver
What does Prompt Improver do?
Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness. Prompt Improver is an agent skill from jeremylongshore/tons-of-skills-marketplace. Analyze and improve plugin prompts, skill definitions, and command instructions for clarity, safety, and effectiveness.
When should I use Prompt Improver?
Prompt Improver fits situations like: the user asks to improve a prompt; enhance instructions; make this prompt better; optimize this command.
How do I install Prompt Improver in Claude Code?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a claude-code`. Or copy the skill folder (skills/.curated/prompt-improver in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/prompt-improver in your project. Claude Code loads it when a task matches its description.
How do I install Prompt Improver in Codex?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a codex`. Or copy the skill folder (skills/.curated/prompt-improver in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/prompt-improver in your project. Codex loads it when a task matches its description.
Can I use Prompt Improver in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill prompt-improver -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/prompt-improver, .gemini/skills/prompt-improver, .github/skills/prompt-improver and .opencode/skills/prompt-improver in your project.
What does Prompt Improver need to run?
SKILL.md names no scripts, command-line tools or credentials: Prompt Improver is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep. Compatibility (from SKILL.md): Designed for Claude Code.
Does Prompt Improver access the network?
SKILL.md names 2 domains. As links in the text: code.claude.com and platform.claude.com. This is read from the text; nothing was executed.
Is Prompt Improver safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Prompt Improver use?
Prompt Improver is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Prompt Improver use?
About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 530 tokens, read only when the agent opens those files.
What are the alternatives to Prompt Improver?
Skills that share tags, products or a category with Prompt Improver: Codex Fable5 (baskduf/FableCodex, 437 stars), Prompt Template Authoring (nicobailon/pi-prompt-template-model, 321 stars), Context Audit (undefined-ui/second-brain-os, 1k stars) and Asd Ste100 Skill (TwiTech-LAB/devchain, 101 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Prompt Improver?
jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.
Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.