[Course 3 Lesson 3.2] API Design Mastery - GROW by Good Combinator

Design APIs an agent can actually call: contracts, idempotency, and error surfaces.In Lesson 3.2 of GROW Course 3 (Production Agentic Systems), Doug Liles works through it with you. API design rules that make your service safe for an autonomous caller.What you'll take away- Designing for an agent caller- Contracts- IdempotencyChapters(0:00) Cold open & the promise(5:16) Designing for an agent caller(10:32) Contracts(15:49) Idempotency(21:05) Error surfaces(26:22) Versioning(31:38) The artifact & what to do MondayStudy guide, slide deck, blog companion, infographic (free)- https://fde.goodcombinator.ai/lessons/FDE_Lesson_3_2Audio companion is AI-narrated using NotebookLM. Explainer video is human-produced.Public releaseThis full FDE Certification audio lesson is available publicly as part of GROW by Good Combinator.Continue in GROW Skills Library: https://goodcombinator.com/grow/libraryEpisode metadataShow: GROW by Good CombinatorCourse: Course 3 - Production Agentic SystemsLesson: 3.2Season/Episode: 3/2Runtime: 36:55Access label: public-full-lessonSource channel: spotifySource audio: app/lessons/assets/course-3/3.2/3.2 audio podcast.m4aTaxonomy: Domain=Production Agentic Systems; Career stage=FDE; Skill level=Intermediate; Asset type=Capstone; Outcome=BuildCRM events: course_started, lesson_completed, cert_enrolledTranscript and accessibilityFinal transcript required before launch: https://goodcombinator.com/grow/courses/course-3/lesson-3.2/transcriptAccessibility requirement: reviewed audio, clear title, descriptive show notes, and transcript availability before launch.Audio companion is AI-narrated using NotebookLM and disclosed here.CreditsHost: Doug LilesProducer: Good CombinatorAudio: NotebookLM AI narration (disclosed)