Outcome
Expose APIs, code sandboxes, and MCP tools to models with schemas that are safe, understandable, and debuggable.
Building Blocks · Days 40-45
Tool Use and Integrations
Tool use turns a model from a text generator into an operator. Learn schema design, parallel tool calls, MCP, sandboxed execution, API wrappers, and tool result formatting.
Intermediate 6 subtopics 6 daily blocks
Practice builds
MCP-powered dev assistantSandboxed code runnerAPI wrapper toolkit
What to learn
Tool and function schema design: names, descriptions, parameters
Parallel tool calling
Model Context Protocol: servers, clients, resources, prompts
Sandboxed code execution: E2B, Modal, Daytona, Cloudflare sandboxes
API wrappers as tools
Tool result formatting for LLM consumption
Daily study plan
Day 40: Design schemas for three small tools and test model selection.
Day 41: Add parameter validation and tool error messages.
Day 42: Execute multiple read-only tools in parallel and merge results.
Day 43: Build or connect a tiny MCP server.
Day 44: Add sandboxed code execution with strict output limits.
Day 45: Format tool results for compact, reliable model consumption.