API / SDK
Developer guides for the Claude API and SDKs — auth, streaming, tool use, cost control, and agent building, with working code and production-ready patterns.
Building a Text-to-SQL Intelligent Agent with Claude API — Schema Inference, Query Optimization, and Secure Execution for Production
Learn how to build an intelligent agent that converts natural language to SQL using the Claude API. Covers schema inference, query optimization, security hardening, and production-grade implementation patterns.
Production Voice Agents with Claude API: Latency Budgets, Cost, and Fallbacks
Orchestrating Whisper/Deepgram, Claude API, and TTS into a voice agent that survives production — latency budgets measured on Cloudflare Workers and Cloud Run, per-session cost math, three-tier fallbacks, and barge-in handling.
Claude API Production Resilience Patterns — Model Routing, Circuit Breakers, and Fallback Strategies for Indie Teams
Production resilience patterns for Claude API: circuit breakers, intelligent model routing, fallback chains, exponential backoff with jitter, and disaster recovery — with TypeScript implementations and operational notes from an indie developer.
Building LLM Evaluation Pipelines with Claude API — Claude-as-Judge, Prompt A/B Testing, and Quality Scoring Patterns
Designing and implementing LLM evaluation pipelines on the Claude API — Claude-as-Judge, prompt A/B testing, quality scoring, and regression testing for production applications.
Building AI Application Observability with Claude API and OpenTelemetry
Learn how to integrate OpenTelemetry with your Claude API applications for unified tracing, metrics, and logging. Covers token usage visualization, latency monitoring, cost alerting, and distributed tracing for agent workflows.
Build a PDF Analysis and Summarization App with Claude API — Vision plus Extended Thinking
Learn how to build a PDF analysis and summarization application using Claude API's Vision capabilities and Extended Thinking, with step-by-step Python implementation.
Claude API Cost Optimization Production Guide — Combining Batch API, Prompt Caching, and Adaptive Thinking for Up to 90% Savings
Learn practical implementation patterns to cut Claude API costs by up to 90%. Covers Batch API, Prompt Caching, and Adaptive Thinking strategies, plus production monitoring and budget management.
Building Automated Agentic Loops with Claude SDK Tool Runner
Learn how to use Claude SDK's Tool Runner and Tool Helpers to build automated tool-calling loops (agentic loops) with practical code examples in Python and TypeScript.
Claude API Real-time Multimodal Agent Architecture: Design Patterns & Implementation
Master building real-time multimodal agents combining Vision and Tool Use. Learn streaming pipelines, production error handling, and cost optimization patterns with TypeScript and Python examples.
Building Edge AI Microservices with Claude API and Cloudflare Workers
Low-latency, highly scalable AI microservices built from Claude API and Cloudflare Workers — edge design patterns with production-ready code.
Claude API Token Counting Guide — How to Estimate Token Usage and Optimize Costs Before Sending Requests
Learn how to use the Claude API Token Counting endpoint to estimate token usage before sending messages. Covers cost management, context window optimization, and production implementation patterns.
Claude API Usage & Cost API: Programmatic Cost Monitoring and Optimization
Learn how to use Anthropic's Usage & Cost Admin API to programmatically monitor, analyze, and optimize your Claude API spending with practical code examples.
Claude Files API Guide — Upload Once, Reference Anywhere in Your API Calls
Learn how to use the Claude Files API to upload PDFs, images, and text once and reference them across calls. Includes Python and TypeScript examples, a production-grade retry helper, real token cost estimates, and hard-won operational tips.
Claude API Programmatic Tool Calling (PTC) Production Guide — 10x Faster Multi-Tool Workflows
Master Programmatic Tool Calling (PTC) in the Claude API to dramatically reduce latency and token costs in multi-tool workflows. Learn production patterns combining PTC with Tool Search and Input Examples.
First Claude API Call Failing? Common Error FAQ
Claude API beginner's error resolution guide. Covers 401 authentication errors, 429 rate limiting, 400 bad requests, empty responses, streaming failures, tool_use errors, context window exceeded, tool_result submission, and Spanner temporarily unavailable issues.
Claude Code × SaaS Development — Building a Monthly Revenue Pipeline as a Solo Developer
Complete pipeline for developing SaaS products with Claude Code and generating monthly revenue through Stripe subscriptions. From idea validation through MVP construction, payment implementation, and marketing automation.
Claude API Advanced Tool Use: Tool Search, Programmatic Tool Calling, and Tool Use Examples
A working walkthrough of Claude API's Tool Search Tool, Programmatic Tool Calling, and Tool Use Examples — starting with the beta header that everything depends on, plus how to read Anthropic's published reduction figures and when to skip each feature.
Claude Code Analytics API: Building a Team Productivity Dashboard
A hands-on guide to building a custom productivity dashboard using the Claude Code Analytics Admin API—covering authentication, full pagination, aggregation, cost allocation, and production security.
Build a SaaS with Claude API × Stripe— to AI Subscription Monetization
Build and monetize an AI SaaS combining Claude API with Stripe. Covers architecture design, billing models, webhook implementation, and churn prevention.
Building an AI Chatbot with Claude API — Streaming, Conversation History & Cost Optimization
A record of building a chatbot on the Claude API from a minimal script upward: conversation history, streaming, a FastAPI endpoint, cost trimming, LINE/Telegram/Discord, and PII masking. The retry logic was rebuilt around measured jitter and the retry-after header.
Claude Haiku 3 Deprecation (April 19, 2026): Complete Migration Guide to Claude Haiku 4.5
Claude Haiku 3 (claude-3-haiku-20240307) is being retired on April 19, 2026. This guide covers the deprecation timeline, what changes, and how to migrate to Claude Haiku 4.5 with ready-to-use code examples.
Claude API Streaming & Tool Use in Production — Patterns for Parallel Calls, Error Handling, and Retry Strategies
Master production-grade streaming and tool use patterns with Claude API. Learn parallel tool calling, intelligent error handling, resilient retry strategies, and resource optimization.
Multimodal Input Guide — Working with Images and PDFs in the Claude API
How to send images and PDFs to the Claude API, when to reach for the Files API, and the cost and speed lessons you only learn by running it in production — with real measurements.
Claude API Error Handling and Retry Strategies
Learn about Claude API error codes, retry strategies, and rate limit handling. Best practices for building robust API integrations in production.
Claude API Rate Limits — Designing Automation That Doesn't Stall on 429s
Understand how Claude API rate limits (RPM, TPM, TPD) work, and learn practical patterns — token optimization, request queuing, batch processing, and Retry-After-aware retries — drawn from running multiple sites on automation.
Implementing Streaming Responses — Real-time Responses with the Claude API
Implement streaming responses with the Claude API using working Python and TypeScript examples — SSE format, event handling, error recovery, and UI patterns, in the order I verified them.
Claude API Quickstart — Your First API Call in 5 Minutes
Get started with the Claude API. From your API key to your first Python and TypeScript request, plus error handling and cost estimates — a 5-minute quickstart.