Dev.to tutorial Tutorials Nov 2

Claude Code Custom System Prompts in 2026: Overriding Defaults, Appending Instructions, and What You Cannot Change

by jsmanifest

Developers discover that Claude Code ignores custom instructions because they set them in the wrong layer. Learn the three ways to shape Claude Code behavior, what the system prompt actually controls, and which parts remain locked no matter what you

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Anthropic

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Devto Id
4960587
Reading Time Minutes
13

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