Celeste Python
withceleste/celeste-python
A skill your agent uses whenever writing, modifying, reviewing, or debugging code involving Celeste, celeste-ai, celeste-python, import celeste, src/celeste, or withceleste app integrations.
Design tools that agents can use effectively. An agent skill from aiskillstore/marketplace.
Install Tool Design
$ npx skills add aiskillstore/marketplace --skill tool-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace tool-design --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/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/asmayaseen/tool-design .claude/skills/tool-design && 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 "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .claude/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-designType 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 aiskillstore/marketplace --skill tool-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace tool-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/asmayaseen/tool-design .agents/skills/tool-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .agents/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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 aiskillstore/marketplace --skill tool-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace tool-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/asmayaseen/tool-design .cursor/skills/tool-design && 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 "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .cursor/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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/aiskillstore/marketplace.git --path skills/asmayaseen/tool-design--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 aiskillstore/marketplace --skill tool-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace tool-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/asmayaseen/tool-design .gemini/skills/tool-design && 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 "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .gemini/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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 aiskillstore/marketplace tool-designInstalls 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 aiskillstore/marketplace --skill tool-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/asmayaseen/tool-design .github/skills/tool-design && 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 "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .github/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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 aiskillstore/marketplace --skill tool-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace tool-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/asmayaseen/tool-design .opencode/skills/tool-design && 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 "tool-design" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/asmayaseen/tool-design into .opencode/skills/tool-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "tool-design", 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
tool-design- GitHub stars
- 430
- Used in
- 1 other repo
- Token cost
- ~3.1k tokens
- SKILL.md length
- 1,430 words
- Files
- 5 (incl. scripts, references)
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- None found
At a glance
Design tools that agents can use effectively. An agent skill from aiskillstore/marketplace.
- Works in 5 steps: Identify distinct workflows agents must… → Group related actions into comprehensive… → Ensure each tool has a clear,… → …
- Creating new tools for agents
- SKILL.md covers When to Activate, Core Concepts, Detailed Topics and Practical Guidance, plus 5 more sections
- Runs Python scripts from its folder
What it does
Tool Design is an agent skill from aiskillstore/marketplace. Design tools that agents can use effectively. Use when creating new tools for agents, debugging tool-related failures, or optimizing existing tool sets.
Its SKILL.md is about 3.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts and reference files (for example `references/best_practices.md`, `scripts/description_generator.py` and `scripts/verify.py`).
It sits in Development, covering Structured output and tool calling. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Creating new tools for agents
- Debugging tool-related failures
- Optimizing existing tool sets
Example prompts
- “/tool-design”
Requirements
- Python 3
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Identify distinct workflows agents must accomplish
- Group related actions into comprehensive tools
- Ensure each tool has a clear, unambiguous purpose
- Document error cases and recovery paths
- Test with actual agent interactions
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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.
Context cost
Tool Design loads about 3.1k tokens when it runs, and up to ~5.8k if it reads all its reference files. Until then it costs about 41 tokens; SKILL.md has 1,430 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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,430 words (~3,146 tokens).
“Tools are the primary mechanism through which agents interact with the world. They define the contract between deterministic systems and non-deterministic agents. Unlike traditional software APIs designed for developers, tool APIs must be designed for language models that reason about…”
- name
- tool-design
Files
SKILL.md and 4 other files (scripts, references) in skills/asmayaseen/tool-design of aiskillstore/marketplace.
- SKILL.md
- references/best_practices.md
- scripts/description_generator.py
- scripts/verify.py
- skill-report.json
Open the folder on GitHubat commit ad8daf7
Used in 1 other repository
We found 6 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Tool Design 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 |
|---|---|---|---|---|---|---|
| Tool Design this skillaiskillstore/marketplace | 430 | 1 repos | ~3.1k | Automated safety check: Pass | None | |
| Celeste Pythonwithceleste/celeste-python | 221 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Perfupraullenchai/Rapid-MLX | 3.9k | — | ~1.6k | Automated safety check: Notes | Custom licence | |
| Google Agents CLI Adk Codepifferologo/cloud-agents-cli | 129 | 1 repos | ~768 | Automated safety check: Pass | Apache-2.0 | |
| Lintlang Audithermes-labs-ai/lintlang | 137 | 1 repos | ~1.8k | Automated safety check: Pass | Apache-2.0 | |
| Instructor Structured LLM OutputsOrchestra-Research/AI-Research-SKILLs | 13k | 7 repos | ~4.2k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Tool Design
What does Tool Design do?
Design tools that agents can use effectively. An agent skill from aiskillstore/marketplace. Tool Design is an agent skill from aiskillstore/marketplace. Design tools that agents can use effectively.
When should I use Tool Design?
Tool Design fits situations like: creating new tools for agents; debugging tool-related failures; optimizing existing tool sets.
How do I install Tool Design in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill tool-design -a claude-code`. Or copy the skill folder (skills/asmayaseen/tool-design in aiskillstore/marketplace) into .claude/skills/tool-design in your project. Claude Code loads it when a task matches its description.
How do I install Tool Design in Codex?
Run `npx skills add aiskillstore/marketplace --skill tool-design -a codex`. Or copy the skill folder (skills/asmayaseen/tool-design in aiskillstore/marketplace) into .agents/skills/tool-design in your project. Codex loads it when a task matches its description.
Can I use Tool Design 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 aiskillstore/marketplace --skill tool-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tool-design, .gemini/skills/tool-design, .github/skills/tool-design and .opencode/skills/tool-design in your project.
What does Tool Design need to run?
Going by SKILL.md and its folder, Tool Design needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Tool Design access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Tool Design 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Tool Design use?
No licence was found for Tool Design or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Tool Design use?
About 3.1k tokens (SKILL.md is roughly 13k 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 2.7k tokens, read only when the agent opens those files.
What are the alternatives to Tool Design?
Skills that share tags, products or a category with Tool Design: Celeste Python (withceleste/celeste-python, 221 stars), Perfup (raullenchai/Rapid-MLX, 3.9k stars), Google Agents CLI Adk Code (pifferologo/cloud-agents-cli, 129 stars) and Lintlang Audit (hermes-labs-ai/lintlang, 137 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Tool Design?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.