Type-Safe Claude API Tool Calling with Zod: Patterns for TypeScript Developers
How to implement Claude API tool calling with TypeScript and Zod for full type safety. Covers schema-to-API conversion, runtime validation, and three common pitfalls with practical code examples.
Maximizing Profit Margins with Claude Haiku / Sonnet / Opus Model Switching
A complete implementation guide for dynamically routing Claude API requests to the right model based on task complexity. Includes cost calculation formulas, routing engine code, quality fallback logic, and real-world margin impact data.
Claude API × Python in Practice: Building an AI Assistant with Tool Calling and Streaming
A practical guide to combining Claude API's Tool Use and Streaming in Python. Build a working AI assistant with real tool execution, complete source code included, plus a breakdown of the tricky parts that trip up most developers.
Let Claude Diagnose Its Own Tool Errors — Building a Self-Correction Loop with the Anthropic API
Learn how to handle Tool Use failures gracefully by feeding error details back to Claude using the is_error flag, enabling self-diagnosis and automatic retry. Includes working Python code and production antipatterns to avoid.
Building a 'Think-and-Search' AI Agent — Claude API Extended Thinking × Tool Use
A deep dive into combining Claude API Extended Thinking and Tool Use. Covers frequent errors, a complete research agent implementation in Python, plus cost estimation, timeout design, and error recovery for production use.
Cancelling Claude API Streams the Right Way: AbortController, Token Billing, and Connection Hygiene
I measured 100 cancelled Claude API streams to find out what actually gets billed. The drift numbers, the $18.70/month a missing close handler costs you, the proxy buffering trap, and a ledger that never loses a usage event — Node.js and Python.
Calling Claude API from iOS Shortcuts: A Personal Setup for Reshaping Selected Text on the Fly
A personal setup guide for invoking the Claude API directly from iOS Shortcuts. Reshape selected text in seconds with a Cloudflare Workers proxy that keeps your API key off the device.
When Your Claude API Retry Logic Made Rate Limits Worse — The Retry-After Header You Forgot to Read
If 429 errors went up after you added retry logic to your Claude API client, the cause is almost always the same: ignoring the Retry-After header and using exponential backoff without jitter. Here is how to diagnose and fix it.
Why "The requested model does not exist" Won't Go Away — Claude API Naming and Access Pitfalls
The model_not_found error in the Claude API is almost always a typo or a stale model alias — not a permissions issue. Here are the current model IDs as of April 2026 and a clear order for narrowing down the cause.
Claude API × Inngest — Durable AI Workflows with Retries, Idempotency, and Human Approval
A production-grade pattern for combining Claude API with Inngest. Build TypeScript-first durable AI workflows that retry safely, stay idempotent, gate dangerous calls behind human approval, and run on Vercel or Cloudflare Workers.
Diagnosing Claude API Prompt Cache Misses — How to Read the usage Field
If your Claude API prompt cache isn't reducing your bill, the usage field is where to start. This guide walks through the five most common reasons cache_read_input_tokens stays at zero and how to fix each one.
Production Infrastructure for Claude API — 8 Things You Need Between 'It Works' and 'It Holds Up'
There is a much bigger gap than you'd think between a working Claude API call on your laptop and a service that survives real users. Here are the eight pieces of infrastructure I now consider non-negotiable, learned the hard way.