A Claude Code session confabulated a nonexistent Python file, persisted against five truthful "does not exist" errors, then self-diagnosed as corrupted tool output. A reconstruction from the raw transcript, a corpus scan across 3,001 sessions on whether the failure is worse in Opus 4.8, and a model-independent mitigation.
#claude-code
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Claude Code silently kills stdio MCP servers during idle periods, forcing manual reconnection. How I converted a fragile stdio bridge into a persistent Starlette HTTP reverse proxy — and the obscure SDK crash that followed.
A complete beginner's guide to setting up every safety layer from the Coding Safer with LLMs post: pre-commit hooks, local review agents, CI workflows, and CLAUDE.md — starting from scratch.