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update-config

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Use this skill to configure the Claude Code harness via settings.json. Automated behaviors ("from now on when X", "each time X", "whenever X", "before/after X") require hooks configured in settings.json - the harness executes these, not Claude, so memory/preferences cannot fulfill them. Also use for: permissions ("allow X", "add permission", "move permission to"), env vars ("set X=Y"), hook troubleshooting, or any changes to settings.json/settings.local.json files. Examples: "allow npm commands", "add bq permission to global settings", "move permission to user settings", "set DEBUG=true", "when claude stops show X". For simple settings like theme/model, suggest the /config command.

Anthropic/claude-code/skills/update-config/SKILL.md

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Nov 10, 2026
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CC0-1.0

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# Update Config Skill

Modify Claude Code configuration by updating settings.json files.

## When Hooks Are Required (Not Memory)

If the user wants something to happen automatically in response to an EVENT, they need a **hook** configured in settings.json. Memory/preferences cannot trigger automated actions.

**These require hooks:**
- "Before compacting, ask me what to preserve" → PreCompact hook
- "After writing files, run prettier" → PostToolUse hook with Write|Edit matcher
- "When I run bash commands, log them" → PreToolUse hook with Bash matcher
- "Always run tests after code changes" → PostToolUse hook
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