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Tools are how AI agents interact with the world. An agent skill from benjaminasterA/antigravity-awesome-skills.
Install Agent Tool Builder
$ npx skills add benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install benjaminasterA/antigravity-awesome-skills agent-tool-builder --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/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/agent-tool-builder .claude/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .claude/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builderType 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 benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install benjaminasterA/antigravity-awesome-skills agent-tool-builder --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/agent-tool-builder .agents/skills/agent-tool-builder && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .agents/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install benjaminasterA/antigravity-awesome-skills agent-tool-builder --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/agent-tool-builder .cursor/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .cursor/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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/benjaminasterA/antigravity-awesome-skills.git --path skills/agent-tool-builder--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 benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install benjaminasterA/antigravity-awesome-skills agent-tool-builder --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/agent-tool-builder .gemini/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .gemini/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 benjaminasterA/antigravity-awesome-skills agent-tool-builderInstalls 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 benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/agent-tool-builder .github/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .github/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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 benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install benjaminasterA/antigravity-awesome-skills agent-tool-builder --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/benjaminasterA/antigravity-awesome-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/agent-tool-builder .opencode/skills/agent-tool-builder && 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 "agent-tool-builder" agent skill from https://github.com/benjaminasterA/antigravity-awesome-skills/tree/main/skills/agent-tool-builder into .opencode/skills/agent-tool-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-tool-builder", 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
agent-tool-builder- GitHub stars
- 372
- Used in
- 1 other repo
- Token cost
- ~371 tokens
- SKILL.md length
- 157 words
- Files
- 1
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- MIT
At a glance
Tools are how AI agents interact with the world. An agent skill from benjaminasterA/antigravity-awesome-skills.
- Databases work in your project
- SKILL.md covers Capabilities, Patterns, Anti-Patterns and Related Skills, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Agent Tool Builder is an agent skill from benjaminasterA/antigravity-awesome-skills. Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessar...
Its SKILL.md is about 370 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Databases. The repository describes itself as: antigravity-awesome-skills. The licence is MIT.
When your agent uses it
- Databases work in your project
Example prompts
- “Use the agent-tool-builder skill to tool are how AI agents interact with the world. An agent skill from benjaminasterA/antigravity-awesome-skills”
- “/agent-tool-builder”
What it can do on your machine
Read from SKILL.md and the folder at commit 0dcad8a. 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.
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
Agent Tool Builder loads about 371 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 157 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 benjaminasterA/antigravity-awesome-skills at commit 0dcad8a, republished under its MIT licence (© benjaminasterA). 157 words, ~371 tokens.
Download SKILL.mdSave it as
.claude/skills/agent-tool-builder/SKILL.md (or your agent's skills folder).- name
- agent-tool-builder
- description
- Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessar...
- source
- vibeship-spawner-skills (Apache 2.0)
- risk
- unknown
Agent Tool Builder
You are an expert in the interface between LLMs and the outside world. You've seen tools that work beautifully and tools that cause agents to hallucinate, loop, or fail silently. The difference is almost always in the design, not the implementation.
Your core insight: The LLM never sees your code. It only sees the schema and description. A perfectly implemented tool with a vague description will fail. A simple tool with crystal-clear documentation will succeed.
You push for explicit error hand
Capabilities
- agent-tools
- function-calling
- tool-schema-design
- mcp-tools
- tool-validation
- tool-error-handling
Patterns
Tool Schema Design
Creating clear, unambiguous JSON Schema for tools
Tool with Input Examples
Using examples to guide LLM tool usage
Tool Error Handling
Returning errors that help the LLM recover
Anti-Patterns
❌ Vague Descriptions
❌ Silent Failures
❌ Too Many Tools
Related Skills
Works well with: multi-agent-orchestration, api-designer, llm-architect, backend
When to Use
This skill is applicable to execute the workflow or actions described in the overview.
© benjaminasterA, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/agent-tool-builder of benjaminasterA/antigravity-awesome-skills.
Open the folder on GitHubat commit 0dcad8a
Used in 1 other repository
We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in benjaminasterA/antigravity-awesome-skills, which our catalogue first saw on October 9, 2026.
Compare with similar skills
Agent 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Agent Tool Builder this skillbenjaminasterA/antigravity-awesome-skills | 372 | 1 repos | ~371 | Automated safety check: Pass | MIT | |
| Keeper Stress AnalysisClickHouse/ClickHouse | 50k | — | ~4.7k | Automated safety check: Pass | Apache-2.0 | |
| Perf ComparisonClickHouse/ClickHouse | 50k | — | ~3.9k | Automated safety check: Notes | Apache-2.0 | |
| Patch Release CheckClickHouse/ClickHouse | 50k | — | ~4k | Automated safety check: Notes | Apache-2.0 | |
| Evolving The Data ModelTriliumNext/Trilium | 38k | — | ~2.1k | Automated safety check: Pass | AGPL-3.0 | |
| Hybrid Cloud Outboxesgetsentry/sentry | 46k | — | ~4.8k | Automated safety check: Pass | Custom licence |
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Questions about Agent Tool Builder
What does Agent Tool Builder do?
Tools are how AI agents interact with the world. An agent skill from benjaminasterA/antigravity-awesome-skills. Agent Tool Builder is an agent skill from benjaminasterA/antigravity-awesome-skills. Tools are how AI agents interact with the world.
When should I use Agent Tool Builder?
Agent Tool Builder fits situations like: databases work in your project.
How do I install Agent Tool Builder in Claude Code?
Run `npx skills add benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a claude-code`. Or copy the skill folder (skills/agent-tool-builder in benjaminasterA/antigravity-awesome-skills) into .claude/skills/agent-tool-builder in your project. Claude Code loads it when a task matches its description.
How do I install Agent Tool Builder in Codex?
Run `npx skills add benjaminasterA/antigravity-awesome-skills --skill agent-tool-builder -a codex`. Or copy the skill folder (skills/agent-tool-builder in benjaminasterA/antigravity-awesome-skills) into .agents/skills/agent-tool-builder in your project. Codex loads it when a task matches its description.
Can I use Agent 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 benjaminasterA/antigravity-awesome-skills --skill agent-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/agent-tool-builder, .gemini/skills/agent-tool-builder, .github/skills/agent-tool-builder and .opencode/skills/agent-tool-builder in your project.
What does Agent Tool Builder need to run?
SKILL.md names no scripts, command-line tools or credentials: Agent Tool Builder is instructions for the agent only.
Does Agent 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 Agent 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 Agent Tool Builder use?
Agent 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 Agent Tool Builder use?
About 371 tokens (SKILL.md is roughly 1.5k 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 Agent Tool Builder?
Skills that share tags, products or a category with Agent Tool Builder: Keeper Stress Analysis (ClickHouse/ClickHouse, 50k stars), Perf Comparison (ClickHouse/ClickHouse, 50k stars), Patch Release Check (ClickHouse/ClickHouse, 50k stars) and Evolving The Data Model (TriliumNext/Trilium, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Agent Tool Builder?
benjaminasterA (a GitHub user) maintains it in benjaminasterA/antigravity-awesome-skills, which has 372 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 8, 2026.
Source: benjaminasterA/antigravity-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.