Claude Code config not taking effect? Four steps to trace sources, overrides and errors

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If Claude Code still behaves the same after a config change, the key itself may not be the problem, so repeatedly swapping credentials or retrying the same error is unhelpful. The guide recommends first checking which settings sources are loaded, using /status to view the Setting sources, rather than guessing which file should apply. It lays out the local settings files and the documented precedence order, noting that list-type keys merge while environment variables must be checked pair by pair against the official docs. It also advises running claude doctor to find settings that were rejected, since strict JSON errors can be silently skipped in non-interactive mode, and recording non-sensitive request details before seeking help.

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