Claude Code Migration Playbook

This book is part of the Claude Code Operator's Library (4 books). Through September 17, 2026, that bundle is in Leanpub's monthly sale at $14.50 for all four, against $51.96 if bought separately. Coupon link: https://leanpub.com/b/cc-operators-library/c/LeanpubMonthlySale202609010

Between March and April 2026, Claude Code subscribers on the Max ($200/mo) and Pro ($20/mo) plans lived through six weeks of stacked regressions: cache TTL shortened from sixty minutes to five, a tokenizer that charged 1.35 to 1.46 times more for the same prompts, Pro access that briefly disappeared and returned forty-eight hours later with no public explanation, and a third-party tool ban. This playbook turns that window into a decision instead of a guess. Five measurable triggers tell you which situation you are actually in. Three paths — stay and fortify, switch, or build your own stack — are laid out with a 30-day cost projection for each. A decision tree returns one specific recommendation rather than a menu, and Chapter 9 makes that decision reversible within forty-eight hours if the output turns out to be wrong. Edition 2 is 251 pages: ten decision-framework chapters, six path supplements, a decision tree expanded from three paths to six, and four appendices — source citations, a competitor grid, further reading, and an updates log. Edition 1 covered the March–April 2026 regression window; Edition 2 carries it forward through the later trigger clusters (Triggers 11 to 16, including silent regression and quota burnout, claim-reality divergence, irreversible operations, and project-scoped settings as an MCP injection vector) and the June 15 billing split, with Chapter 10 on the team performance metrics that hold up under the new economics. This book is reconstructed from public GitHub Issues, Hacker News threads, Simon Willison's measurement posts, The Register's coverage, and independent reverse-engineering. It is not affiliated with or endorsed by Anthropic.

Written by an independent operator who runs Claude Code autonomously and maintains cc-safe-setup, a free MIT-licensed collection of 914 example safety hooks: https://github.com/yurukusa/cc-safe-setup