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Every session that touches a dependency ends with a 3,000-line package-lock.json diff, even when I asked for a one-line version bump. Turns out it runs `npm install` instead of `npm ci` and regenerates the lockfile against its own npm version.
A long session dies mid-turn with a 400 and the instruction to run /rewind. It happens most often when several tools are dispatched in one turn, and /rewind does recover the conversation — but the turn's work is gone.
Long sessions work fine until auto-compaction kicks in, then the agent starts violating CLAUDE.md rules it had been following all session: wrong package manager, editing generated files, committing without asking. The rules are still on disk; it just stops consulting them.
Asking for a whole file back — a long migration, a generated fixture, a full rewrite — fails outright instead of truncating. The fix is to stop asking for one enormous message.
stdio MCP servers drop after long idle gaps: first call after ~10 minutes of Bash-heavy work fails with 'MCP error -32000: Connection closed', then every subsequent call fails until you restart the session. Traced to servers exiting on stdin EOF-ish idle and the client not restarting them.
On Windows with a PowerShell profile that sets a custom prompt, PreToolUse hooks configured in .claude/settings.json silently never execute. No error, no log line — tool calls just proceed unguarded. Fixed in 2.1.219.