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Agent skill

Tool Design

by aiskillstore in aiskillstore/marketplace

Build tools that agents can use effectively, including architectural reduction patterns

No licenceAuto-check passed

Install Tool Design

skills CLI
$ npx skills add aiskillstore/marketplace --skill tool-design -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install aiskillstore/marketplace tool-design --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sickn33/tool-design .claude/skills/tool-design && rm -rf skills-src

Use ~/.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/

Facts

Skill name
tool-design
GitHub stars
430
Used in
5 other repos
Token cost
~3.9k tokens
SKILL.md length
1,824 words
Files
2
Skills in repo
1,044
Repo updated
First seen
Licence
None found

At a glance

Build tools that agents can use effectively, including architectural reduction patterns

  • Works in 4 steps: File systems are a proven abstraction… → Standard tools have predictable,… → The agent can chain primitives flexibly… → …
  • SKILL.md covers When to Use This Skill, When to Activate, Core Concepts and Detailed Topics, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Tool Design is an agent skill from aiskillstore/marketplace. Build tools that agents can use effectively, including architectural reduction patterns

Its SKILL.md is about 3.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).

The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.

Example prompts

  • “/tool-design”

Requirements

  • Python 3

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. File systems are a proven abstraction that models understand deeply
  2. Standard tools have predictable, well-documented behavior
  3. The agent can chain primitives flexibly rather than being constrained to predefined workflows
  4. Good documentation in files replaces the need for summarization tools

What it can do on your machine

Read from SKILL.md and the folder at commit 755bc35. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are python).

    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 3.9k tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 1,824 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~25
When it runs · the whole SKILL.md, loaded when a task matches
~3.9k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,824 words (~3,922 tokens).

“Build tools that agents can use effectively, including architectural reduction patterns”

— opening of SKILL.md by aiskillstore
name
tool-design
source
https://github.com/muratcankoylan/Agent-Skills-for-Context-Engineering/tree/main/skills/tool-design
risk
safe

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in skills/sickn33/tool-design of aiskillstore/marketplace.

  • SKILL.md
  • skill-report.json

Open the folder on GitHubat commit 755bc35

Used in 5 other repositories

We found 14 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 5 other GitHub owners. 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.

Tool Design compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Tool Design this skillaiskillstore/marketplace4305 repos~3.9kAutomated safety check: PassNone
Architecture Patternswshobson/agents40k—~2kAutomated safety check: PassMIT
Android Clean Architectureaffaan-m/ECC276k4 repos~2.2kAutomated safety check: PassMIT
Architecture Patternsdavila7/claude-code-templates32k4 repos~483Automated safety check: PassMIT
Architecture Docs Writerprisma/orm48k—~1.6kAutomated safety check: PassApache-2.0
Architecture Decision Recordsaffaan-m/ECC276k4 repos~1.8kAutomated safety check: PassMIT

Similar skills

  • Architecture Patterns

    wshobson/agents

    Implement proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design.

    40k GitHub stars~2k tokensUpdated 4 days ago
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  • Android Clean Architecture

    affaan-m/ECC

    Applies Clean Architecture to Android and Kotlin Multiplatform projects: module layout, dependency rules, UseCases, Repositories and data layer patterns.

    276k GitHub starsUsed in 4 repos~2.2k tokens
    DevelopmentAuto-check passed

  • Architecture Patterns

    davila7/claude-code-templates

    Master proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design to build maintainable, testable, and scalable systems.

    32k GitHub starsUsed in 4 repos~483 tokens
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  • Architecture Docs Writer

    prisma/orm

    Official

    Guides writing and rewriting architecture subsystem docs, ADRs and reference pages so they make sense to a developer with no prior project context.

    48k GitHub stars~1.6k tokensUpdated today
    DevelopmentAuto-check passed

  • Architecture Decision Records

    affaan-m/ECC

    Capture architectural decisions as numbered ADR markdown files in docs/adr/ with context, alternatives considered, consequences, and an index README.

    276k GitHub starsUsed in 4 repos~1.8k tokens
    DevelopmentAuto-check passed

  • Architecture

    JanDeDobbeleer/oh-my-posh

    Cross-language architecture and clean-code principles for this project: Clean Code, Object Calisthenics, SOLID, guard clauses, hot-path cost, and the code review checklist.

    24k GitHub stars~1.5k tokensUpdated yesterday
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More from aiskillstore/marketplace

All 1,044 skills in this repo

  • Code Stats

    aiskillstore/marketplace

    Analyze codebase with tokei (fast line counts by language) and difft (semantic AST-aware diffs).

    430 GitHub starsUsed in 1 repo~697 tokens
    Auto-check: notes

  • Data Processing

    aiskillstore/marketplace

    Process JSON with jq and YAML/TOML with yq. An agent skill from aiskillstore/marketplace.

    430 GitHub starsUsed in 1 repo~720 tokens
    Auto-check: notes

  • Doc Scanner

    aiskillstore/marketplace

    Scans for project documentation files (AGENTS.md, CLAUDE.md, GEMINI.md, COPILOT.md, CURSOR.md, WARP.md, and 15+ other formats) and synthesizes guidance.

    430 GitHub starsUsed in 1 repo~644 tokens
    Auto-check: notes

  • File Search

    aiskillstore/marketplace

    Modern file and content search using fd, ripgrep (rg), and fzf.

    430 GitHub starsUsed in 1 repo~598 tokens
    Auto-check: notes

  • Find Replace

    aiskillstore/marketplace

    Modern find-and-replace using sd (simpler than sed) and batch replacement patterns.

    430 GitHub starsUsed in 1 repo~527 tokens
    Auto-check: notes

  • Project Planner

    aiskillstore/marketplace

    Detects stale project plans and suggests session commands. An agent skill from aiskillstore/marketplace.

    430 GitHub starsUsed in 1 repo~504 tokens
    Auto-check passed

Questions about Tool Design

What does Tool Design do?

Build tools that agents can use effectively, including architectural reduction patterns. Tool Design is an agent skill from aiskillstore/marketplace.

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/sickn33/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/sickn33/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?

SKILL.md names no scripts, command-line tools or credentials: Tool Design is instructions for the agent only. 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. Review the folder before installing.

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 3.9k tokens (SKILL.md is roughly 16k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Tool Design?

Skills that share tags, products or a category with Tool Design: Architecture Patterns (wshobson/agents, 40k stars), Android Clean Architecture (affaan-m/ECC, 276k stars), Architecture Patterns (davila7/claude-code-templates, 32k stars) and Architecture Docs Writer (prisma/orm, 48k 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 1,044 skills in this directory. The repository was last updated on October 9, 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.