All Articles
Building a Budget Circuit Breaker for Claude API in Production — Auto-Halt When Daily Token Spend Exceeds Your Cap
A practical guide to enforcing daily and monthly Claude API budget caps in production. Includes copy-paste Cloudflare Workers + KV / Durable Objects code, three response strategies (halt, degrade, alert), and the operational habits that keep the breaker honest.
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.
Stop Claude API Prompt Regressions with Golden-Dataset Testing
A complete production guide to catching the silent quality drift that hits Claude API prompts when models or prompts change — using golden datasets and LLM-as-a-Judge wired into CI.
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.
Claude API Telemetry on ClickHouse: A Production Guide to Cost, Latency, and Error Analytics
Stream per-request Claude API telemetry into ClickHouse, build sub-second dashboards with materialized views, and detect cost spikes, retry loops, and silent failures with practical SQL recipes.
Fix Claude API's 'messages.X.role must alternate' in One Minute — Common 400 invalid_request_error Patterns
A pattern-by-pattern guide to fixing the 'messages.X.role must alternate' error in Claude's Messages API — covering user/assistant alternation, tool_use and tool_result pairing, and history-trimming pitfalls with working code.
Building a Production Multilingual Translation SaaS with Claude API — Glossaries, Style, and Domain Adaptation in Practice
A practical, code-first design guide for running a translation SaaS on Claude API: glossaries, style guides, domain adaptation, quality gates, and cost controls that survive real production traffic.
Building a Production Claude API Pipeline on Cloudflare Queues: Fault Tolerance, Backpressure, and Cost Control
A practical, code-first walkthrough for routing Claude API calls through Cloudflare Queues — covering producer/consumer code, retry-vs-DLQ branching, priority lanes, and token budgeting for production workloads.
Infrastructure Requirements for Claude API Deployment: Sizing, SLA, and Compliance Decisions Before Production
Your prototype works. But what does 'production-ready' actually mean? This guide walks through how to derive infrastructure requirements from traffic, SLA, and data-residency decisions — with concrete numbers and a sizing formula.
Production Semantic Cache for Claude API — Similarity Thresholds, Pollution Defense, and What to Track
A production playbook for adding a semantic cache in front of Claude API — threshold tuning, multi-tenant isolation, pollution prevention, fallbacks, and the metrics that actually prove it works.
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.
Four Infrastructure Levers That Cut Claude API Latency Before You Touch the Model
Before you downgrade Sonnet to Haiku to chase faster responses, the network and request shape around your Claude API calls usually has more headroom. Here are four infrastructure levers — region selection, connection pooling, prompt caching, and streaming — with code and measurement notes.