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Agent skill

Personal Tool Builder

by sickn33 in sickn33/agentic-awesome-skills

Expert in building custom tools that solve your own problems first.

MITAuto-check passed

Install Personal Tool Builder

skills CLI
$ npx skills add sickn33/agentic-awesome-skills --skill personal-tool-builder -a claude-code

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

GitHub CLI
$ gh skill install sickn33/agentic-awesome-skills personal-tool-builder --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/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/personal-tool-builder .claude/skills/personal-tool-builder && 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
personal-tool-builder
GitHub stars
47k
Used in
2 other repos
Token cost
~874 tokens
SKILL.md length
315 words
Files
2 (incl. references)
Skills in repo
1,354
Repo updated
First seen
Licence
MIT

At a glance

Expert in building custom tools that solve your own problems first.

  • SKILL.md covers Detailed Guide, Security in Personal Tools, When to Use and Limitations
  • Needs API_KEY

What it does

Personal Tool Builder is an agent skill from sickn33/agentic-awesome-skills. Expert in building custom tools that solve your own problems first. The best products often start as personal tools - scratch your own itch, build for yourself, then discover others have the same itch.

Its SKILL.md is about 870 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/detailed-guide.md`).

The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.

Example prompts

  • “/personal-tool-builder”

Requirements

  • A credential in API_KEY
  • A credential in MY_API_KEY

What it can do on your machine

Read from SKILL.md and the folder at commit ec02547. 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 javascript).

    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 these keys or tokens, usually read from environment variables:

    • API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Personal Tool Builder loads about 874 tokens when it runs, and up to ~4.6k if it reads all its reference files. Until then it costs about 56 tokens; SKILL.md has 315 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~874
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.6k

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 sickn33/agentic-awesome-skills at commit ec02547, republished under its MIT licence (© sickn33). 315 words, ~874 tokens.

Download SKILL.mdSave it as .claude/skills/personal-tool-builder/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
personal-tool-builder
description
Expert in building custom tools that solve your own problems first. The best products often start as personal tools - scratch your own itch, build for yourself, then discover others have the same itch.
risk
critical
source
vibeship-spawner-skills (Apache 2.0)
date_added
2026-02-27

Personal Tool Builder

Expert in building custom tools that solve your own problems first. The best products often start as personal tools - scratch your own itch, build for yourself, then discover others have the same itch. Covers rapid prototyping, local-first apps, CLI tools, scripts that grow into products, and the art of dogfooding.

Role: Personal Tool Architect

You believe the best tools come from real problems. You've built dozens of personal tools - some stayed personal, others became products used by thousands. You know that building for yourself means you have perfect product-market fit with at least one user. You build fast, iterate constantly, and only polish what proves useful.

Expertise
  • Rapid prototyping
  • CLI development
  • Local-first architecture
  • Script automation
  • Problem identification
  • Tool evolution

Detailed Guide

Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.

Security in Personal Tools

Common Mistakes
RiskMitigation
API keys in codeUse env vars or config file
Tool exposed on networkBind to localhost only
No input validationValidate even your own input
Logs contain secretsSanitize logging
Git commits with secrets.gitignore config files
Credential Management
javascript
// Never in code
const leakedToken = '[redacted API key]'; // BAD

// Environment variable
const API_KEY = process.env.MY_API_KEY;

// Config file (gitignored)
import { readFileSync } from 'fs';
const config = JSON.parse(
  readFileSync(join(homedir(), '.mytool', 'config.json'))
);
const API_KEY = config.apiKey;
Localhost-Only Servers
javascript
// If your tool has a web UI
import express from 'express';
const app = express();

// ALWAYS bind to localhost for personal tools
app.listen(3000, '127.0.0.1', () => {
  console.log('Running on http://localhost:3000');
});

// NEVER do this for personal tools:
// app.listen(3000, '0.0.0.0') // Exposes to network!
Before Sharing
Checklist:
[ ] No hardcoded credentials
[ ] Config file is gitignored
[ ] README mentions credential setup
[ ] No personal paths in code
[ ] No sensitive data in repo
[ ] Reviewed git history for secrets

When to Use

  • User mentions or implies: build a tool
  • User mentions or implies: personal tool
  • User mentions or implies: scratch my itch
  • User mentions or implies: solve my problem
  • User mentions or implies: CLI tool
  • User mentions or implies: local app
  • User mentions or implies: automate my
  • User mentions or implies: build for myself

Limitations

  • Use this skill only when the task clearly matches the scope described above.
  • Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
  • Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

© sickn33, 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/personal-tool-builder of sickn33/agentic-awesome-skills.

  • SKILL.md
  • references/detailed-guide.md

Open the folder on GitHubat commit ec02547

Used in 2 other repositories

We found 8 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Personal Tool Builder 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.

Personal Tool Builder compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Personal Tool Builder this skillsickn33/agentic-awesome-skills47k2 repos~874Automated safety check: PassMIT
Personal Tool Builderdavila7/claude-code-templates32k3 repos~1.8kAutomated safety check: PassMIT
Team Builderaffaan-m/ECC275k1 repos~1.8kAutomated safety check: PassMIT
Team Builderaffaan-m/ECC275k1 repos~808Automated safety check: PassMIT
Dashboard Builderaffaan-m/ECC275k—~221Automated safety check: PassMIT
Dashboard Builderaffaan-m/ECC275k—~279Automated safety check: PassMIT

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Questions about Personal Tool Builder

What does Personal Tool Builder do?

Expert in building custom tools that solve your own problems first. Personal Tool Builder is an agent skill from sickn33/agentic-awesome-skills. Expert in building custom tools that solve your own problems first.

How do I install Personal Tool Builder in Claude Code?

Run `npx skills add sickn33/agentic-awesome-skills --skill personal-tool-builder -a claude-code`. Or copy the skill folder (skills/personal-tool-builder in sickn33/agentic-awesome-skills) into .claude/skills/personal-tool-builder in your project. Claude Code loads it when a task matches its description.

How do I install Personal Tool Builder in Codex?

Run `npx skills add sickn33/agentic-awesome-skills --skill personal-tool-builder -a codex`. Or copy the skill folder (skills/personal-tool-builder in sickn33/agentic-awesome-skills) into .agents/skills/personal-tool-builder in your project. Codex loads it when a task matches its description.

Can I use Personal Tool Builder 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 sickn33/agentic-awesome-skills --skill personal-tool-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/personal-tool-builder, .gemini/skills/personal-tool-builder, .github/skills/personal-tool-builder and .opencode/skills/personal-tool-builder in your project.

What does Personal Tool Builder need to run?

Going by SKILL.md and its folder, Personal Tool Builder needs credentials named API_KEY. Our summary lists: A credential in API_KEY; A credential in MY_API_KEY.

Does Personal Tool Builder 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 Personal Tool Builder 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 Personal Tool Builder use?

Personal Tool Builder is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Personal Tool Builder use?

About 874 tokens (SKILL.md is roughly 3.5k 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 3.7k tokens, read only when the agent opens those files.

What are the alternatives to Personal Tool Builder?

Skills that share tags, products or a category with Personal Tool Builder: Personal Tool Builder (davila7/claude-code-templates, 32k stars), Team Builder (affaan-m/ECC, 275k stars), Team Builder (affaan-m/ECC, 275k stars) and Dashboard Builder (affaan-m/ECC, 275k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Personal Tool Builder?

sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,343 GitHub stars. The repository holds 1,354 skills in this directory. The repository was last updated on October 7, 2026.

Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.