Tool Use and Function Calling

Purpose: Build LLM agents that call tools reliably with correct arguments, handle failures gracefully, and produce structured results.

When to Use This Skill

• Designing tools / functions an agent will call
• Defining JSON schemas for tool arguments and structured outputs
• Enabling and tuning parallel tool calls
• Designing tool error contracts and retries
• Building MCP tools (see also mcp-server-development)

Tool Design Principles