# tutorial

Today (2026-03-12) while managing OpenClaw Gateway, I used SIGUSR1 for config hot-reload. Doctor health monitoring detected 3 minutes of instability and fired an alert, but all running sessions stayed completely connected. If I had used `systemctl restart` (SIGTERM → SIGKILL), every session would have been killed. That difference is what we're learning today.

Anthropic killed third-party OAuth tokens — the only way to use your Claude subscription programmatically is through the official CLI. This post breaks down everything about claude -p (print mode): 5 input methods, 3 output formats, JSON schema for structured output, tool whitelisting, session management, bidirectional streaming, and three production-ready wrapper examples.

You type a URL and press Enter every day, but what actually happens in between? This post uses gu-log as a real-world case study to walk you through 7 floors — from DNS to Service Worker — covering the full journey of a URL.

Why you need a Health Suite and how to detect problems early. From a 36-hour restart storm to healthcheck + watchdog as your first line of defense.

Lv-09 continues from Lv-08, focusing on the Recover Layer. We break down rollback safety design, upgrade SOP decision trees, a `|| true` showstopper caught in code review, and actionable drill KPIs.

Understanding OpenClaw architecture from scratch. Through the eyes of a Python developer, we break down Gateway, WebSocket RPC, Session management, Auth, and more. Quiz at every floor!

Breaking down how OpenClaw connects to Telegram, Discord, and more — plus how AI executes commands, drives a browser, and stays safely leashed. A Python-friendly tour of a TypeScript architecture.

How OpenClaw remembers things, learns new skills, and runs tasks on autopilot. From Embeddings to Cron Jobs — explained for Python developers.

The philosophy behind 1,086 tests. Why tests matter more than code review in the AI era. How to use tests as specs. The changing role of a Tech Lead.

Last article covered the Opus 4.6 + Agent Teams announcement. This time we're doing a deep dive into the official docs — when to use Agent Teams, when NOT to use them, how they differ from subagents, setup instructions, and known limitations.

klöss's complete XML prompt framework: 6 core tags + 11 advanced tags, never copy-paste prompts again