Claude Code Complete User Handbook

Abstract

Claude Code is an agentic work environment: a language model operating in a loop with filesystem access, shell execution, browser control, scheduled and cloud execution, external tool connections through the Model Context Protocol, and multi-agent orchestration. Its capability envelope now exceeds what one practitioner can supervise by attention alone, and its failure modes are systemic rather than local: an unreviewed hook, an over-scoped connector, a stale completion condition, an autonomous routine inheriting every credential on an account. This book is a task-oriented reference for operating that system safely and productively, written for practitioners accountable for the result. It advances four propositions. First, capability without a defined and observable completion condition is not productivity. Second, instruction, permission enforcement, sandboxing and operating-system isolation are four distinct layers of a control stack, only two of which are enforced, and conflating them is the most common cause of loss of control. Third, third-party skills, plugins, marketplaces, channels and MCP servers are software supply-chain dependencies and must be governed as such. Fourth, the correct unit of trust in agentic work is observed evidence, not an agent's closing statement. Thirty-four chapters run from installation to a fully verified capstone, with a governance part on managed policy, data residency and retention, observability and accessibility. Every product claim carries a citation to a primary source; an evidence ledger records where a claim in circulation was found wrong, what a later re-verification changed, and what remains unverified. Controls are mapped to seventeen external frameworks in a crosswalk, and an organisational adoption maturity model is proposed. Claims not confirmable from primary sources are labelled UNVERIFIED rather than softened.