davila7
Install Agent Tool Builder
Pick your agent. Every command is ready to paste.
npx skills add davila7/claude-code-templates --skill agent-tool-builderThe open skills CLI detects your agents (Claude Code, Cursor, Codex and 70+ more) and installs to the right folder. Add -g to install globally.
01
Install it
Run the command above, or upload the folder in Claude.
02
Ask naturally
Describe the task. Your agent loads agent-tool-builder when the request matches its description.
03
Name it if needed
If it does not trigger, say “use the agent-tool-builder skill”. In Codex, type $agent-tool-builder.
The skill itself
SKILL.md
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
Tips for Agent Tool Builder
- • Start a fresh session after installing so your agent picks up the new skill.
- • It is part of a pack with 40 skills. Install only the ones you need with --skill to keep triggers precise.
- • If two skills overlap, mention the one you want by name.
Questions about Agent Tool Builder
What does the Agent Tool Builder skill do?
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 necessary. This skill covers tool design from schema to error handling. JSON Schema best practices, description writing that actually helps the LLM, validation, and the emerging MCP standard that's becoming the lingua franca for AI tools. Key insight: Tool descriptions are more important than tool implementa
How do I install Agent Tool Builder?
Run "npx skills add davila7/claude-code-templates --skill agent-tool-builder" in your project. The skills CLI installs it for Claude Code, Cursor, Codex and 70+ other agents. In Claude on the web, upload the skill folder as a ZIP under Customize > Skills.
Does Agent Tool Builder work in Cursor and Codex?
Yes. Agent Tool Builder uses the open SKILL.md format, so it works in Claude Code, Claude, Cursor, OpenAI Codex, Gemini CLI, GitHub Copilot and other agents that support agent skills.
Is Agent Tool Builder free?
Agent Tool Builder is open source on GitHub under the MIT license. It is free to install; check the license before commercial use.
Who made Agent Tool Builder?
Agent Tool Builder is published by davila7 in the davila7/claude-code-templates repository, together with 39 other skills.
