Agent Skills: Build Custom Claude Code Sub-Agents

Create custom Claude Code sub-agents with specialized expertise and tool access. Use when you need to build reusable agents for specific tasks like code review, debugging, data analysis, or domain-specific workflows.

UncategorizedID: resolve-io/.prism/agent-builder

Install this agent skill to your local

pnpm dlx add-skill https://github.com/resolve-io/.prism/tree/HEAD/plugins/prism-devtools/skills/agent-builder

Skill Files

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plugins/prism-devtools/skills/agent-builder/SKILL.md

Skill Metadata

Name
agent-builder
Description
Create custom Claude Code sub-agents with specialized expertise, limited tools, and reusable prompts.

Build Custom Claude Code Sub-Agents

Build reusable agents with focused expertise, scoped tool access, and project or user scope.

Steps

  1. Define agent purpose, trigger conditions, and required tools (single responsibility)
  2. Create .md file in .claude/agents/ (project) or ~/.claude/agents/ (user)
  3. Write frontmatter: name, description, tools, model fields
  4. Write focused system prompt with specific instructions and constraints
  5. Test automatic and explicit invocation; commit project agents to version control

For detailed instructions, see instructions.md.