agent-tool-builder▌
sickn33/antigravity-awesome-skills · updated Apr 8, 2026
Design LLM-facing tool schemas that prevent hallucination, silent failures, and token waste.
- ›Focuses on JSON Schema design, input examples, and error handling patterns that help LLMs use tools correctly
- ›Emphasizes explicit documentation and clear descriptions over implementation details, since LLMs only see the schema
- ›Identifies anti-patterns like vague descriptions, silent failures, and tool overload that cause agent failures
- ›Covers function-calling, MCP tools, and tool validatio
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.
Discussion
Product Hunt–style comments (not star reviews)- No comments yet — start the thread.
Ratings
4.8★★★★★41 reviews- ★★★★★James Ndlovu· Dec 20, 2024
agent-tool-builder is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
- ★★★★★Charlotte Brown· Dec 16, 2024
We added agent-tool-builder from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
- ★★★★★Pratham Ware· Dec 4, 2024
agent-tool-builder reduced setup friction for our internal harness; good balance of opinion and flexibility.
- ★★★★★Dev Thompson· Dec 4, 2024
agent-tool-builder fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
- ★★★★★Yash Thakker· Nov 23, 2024
I recommend agent-tool-builder for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
- ★★★★★Isabella Johnson· Nov 23, 2024
agent-tool-builder fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
- ★★★★★Isabella Okafor· Nov 11, 2024
Solid pick for teams standardizing on skills: agent-tool-builder is focused, and the summary matches what you get after install.
- ★★★★★Dhruvi Jain· Oct 14, 2024
Useful defaults in agent-tool-builder — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
- ★★★★★Henry Garcia· Oct 14, 2024
We added agent-tool-builder from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
- ★★★★★Chinedu Chawla· Oct 2, 2024
agent-tool-builder has been reliable in day-to-day use. Documentation quality is above average for community skills.
showing 1-10 of 41