All Articles
Gemini API FAILED_PRECONDITION Error: Case-by-Case Diagnosis and Fixes
FAILED_PRECONDITION in Gemini API means 'the current system state doesn't allow this operation.' Learn to diagnose and fix all common causes: billing setup, API enablement, context cache expiry, and model access restrictions.
Implementing Structured Output with Gemini Function Calling — Multi-Tool Design Patterns
A practical guide to reliable structured output with Gemini API Function Calling — covering tool definition best practices, multi-tool coordination, and error handling.
Why Is My Gemini API Response Slow? A Practical Diagnosis Guide
Slow Gemini API responses and timeout errors can stem from 4 different causes. This guide walks you through diagnosing each one and applying targeted fixes that actually work.
Building a Type-Safe Gemini Chat Store with Drizzle ORM — Multi-Turn Persistence, Branching Threads, and Vector Search in Production
A production-grade design for persisting Gemini API multi-turn conversations with Drizzle ORM. Covers streaming saves, branching threads, function calling history, pgvector integration, and the migration strategy you actually need.
Building a Subscription SaaS on Gemini API and Cloudflare Workers — A Complete 2026 Implementation Guide
How I wire Gemini API, Stripe, and Cloudflare Workers into a subscription SaaS — with code, and with the places that actually bite: signature checks on Workers, webhook idempotency, KV access control, and the limits of a KV rate limiter.
Launching a Paid Service on Gemini API — A 2026 Roadmap
A practical 2026 roadmap for monetizing a service built on Gemini API — covering model selection, unit economics, pricing models, and the architectural decisions that decide whether your low API costs become a competitive edge or a price-war trap.
A Blueprint for Building a Profitable Indie SaaS on the Gemini API
How to take Gemini's long context, native multimodality, and generous free tier and build them into a recurring-revenue SaaS as a solo founder. Pricing tiers, cost routing rules, and a 90-day plan to your first $1,000 of MRR.
Gemini API Prepaid Billing Migration 2026 — Impact and Pre-Flight Checklist
Gemini API is moving to a prepaid billing model. Here's exactly what changes, what breaks if you ignore it, and the pre-flight checklist I used for my own production services.
Auto-Categorizing 3,000 Wallpaper Images With Gemini Vision API — A Real Production Account
Manually categorizing thousands of wallpaper images doesn't scale. This is a hands-on account of building an auto-classification pipeline with Gemini Vision API — covering design, implementation, actual cost, and the failure patterns I hit running 3,000 images through it.
Automate Contact Form Handling with Gemini API — Classification, Priority Scoring & Slack Alerts
Build a Python system that automatically classifies incoming contact form submissions using Gemini API, scores their priority, and sends structured Slack notifications — ready to deploy today.
Cut Gemini API Costs by 6x with Gemini 2.5 Flash-Lite
Gemini 2.5 Flash-Lite is now stable and generally available. This guide compares pricing against Flash and Pro with real numbers, walks through Python code examples, and explains which tasks are a perfect fit—and which aren't.
Common Gemini API Long Context Problems and How to Fix Them
Struggling with Gemini API's 1 million token context window? This guide covers the most common issues — ignored middle content, slow responses, unexpected costs, and unstable output — with practical code fixes.