Agent Tool Builder is an AI Engineering skill for Claude Code, published by simbajigege in book2skills.
Agent Tool Builder helps define agent tools with a fail-closed pattern that keeps schema, security metadata, and execution together. Use it when creating a new tool or adding validation and permission checks to an existing one.
Agent Tool Builder is cataloged under AI Engineering on DirSkills. Agent Tool Builder comes from a repository tagged agent-skills, agentskills, anthropic, anthropic-claude and book2skills.
Documentation
Helps define agent tools using the fail-closed design pattern: a unified class that co-locates identity, schema, security properties, and execution logic, with fail-closed defaults so new tools are safe by default.
This is the opening of the README. Read the full README on GitHub.
Agent Tool Builder is one of 25 skills that DirSkills catalogs from simbajigege/book2skills, the repository it ships in. Its siblings there include Agent Memory Implementation, Business Adventures Analysis and Common Sense Index Investing. Each one is a separate skill with its own page in this directory, installs the same way Agent Tool Builder does, and is maintained by simbajigege in that same repository. The rest of the collection is listed on the simbajigege/book2skills page.
Agent Tool Builder ranks #3404 by stars among the 3670 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Agent Tool Builder against them. Open each page to compare what they document and how they install.
Agent Tool Builder is one of 25 skills cataloged on DirSkills from simbajigege/book2skills.
Agent Tool Builder is one of 3670 AI Engineering skills cataloged on DirSkills, ranked #3404 by stars among them.