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Claude Code

Claude Code: 10 Common Errors and the /doctor Cheatsheet (2026)

A senior-engineer field guide to the ten errors you will actually hit in Claude Code in 2026 — 529, 401, MCP -32000, Client Closed, plugin and skill failures, subagent timeouts, sandbox denials — plus how to read the /doctor output line by line.

· 11 min read