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AI IntelligenceSep 18, 2026Practical Tip
Article

Claude Code users can save costs by extending sub-agent prompt cache TTL to one hour

Frontier EditorialSource: Reddit r/ClaudeAI
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Source Brief

Claude Code users can save costs by extending sub-agent prompt cache TTL to one hour

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Practical Tip

1. Open your Claude configuration file located at ~/.claude/settings.json.
2. Add or update the setting "subagentPromptCacheTtl": "1h" in the JSON file.
3. Save the file to extend the sub-agent prompt cache lifetime from 5 minutes to 1 hour.
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