Skill
Tools & function calling
LLMs that can call functions. Schema, validation, and least privilege.
Do these first
What you will be able to do
- Define a JSON schema for a tool
- Validate arguments before executing
- Keep tools sandboxed and scoped
Curated resources
Start with the pick, then branch out
Scores are LearnPath editorial opinions (clarity, cost, freshness, project density) — not an objective ranking. Every YouTube item is embedded officially after a click-to-load facade.
Official docs
LearnPath pickdocumentationintermediate
Function calling / tools (OpenAI)
OpenAI40 min
The primitive behind most ‘agents’.
Score 90
OpenProject-based
Alternativedocumentationintermediate
Build an agent (LangChain conceptual docs)
LangChain1h
Libraries churn. Learn the ideas (tools, memory, control loop), not the import paths.
Score 82
Open
28 minLearnPath pickMore curatedyoutube videointermediate
OpenAI Function Calling - Full Beginner Tutorial
Dave Ebbelaar28 min
Twenty-eight minutes that implement function calling properly: schema design, argument validation, error handling and the loop back into the model. The primitive underneath every agent framework, taught directly.
Score 78
Watch
3h 33mMore curatedyoutube courseintermediate
OpenAI Assistants API – Course for Beginners
freeCodeCamp.org3h 33m
Three and a half hours on hosted assistant APIs — tools, file search, code interpreter and threads — a different architecture from building your own loop. Still the most thorough free treatment of managed agent platforms.
Score 77
WatchApply it
Projects