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Glossary · Learn more

System prompt

The instructions sends before your conversation. See what it is, how it works, how it is used and what to watch for, with pictures and examples.

Back to the glossary Claude Code
A purple instruction scroll stands at the front of a conveyor belt, placed before every message envelope.

What it is

The is the set of instructions puts in front of your conversation on every request. It tells how to use tools, how to act safely and how to format answers. You never type it yourself, but it shapes every reply. By default, Claude Code builds it once on the first request of a conversation and keeps using that recorded copy until the conversation is compacted.

How it works

  1. You start Claude Code
  2. Claude Code builds the default
  3. Your flags add or replace text
  4. Every request sends it first

How to use it

  1. --append-system-prompt

    adds your text to the end of the default prompt, for example claude --append-system-prompt "Always use TypeScript".

  2. --append-system-prompt-file

    adds the contents of a file, good for long rules.

  3. --system-prompt

    replaces the whole default prompt, for an that is not a assistant.

  4. --system-prompt-snapshot off

    rebuilds the prompt on every request while you test new wording across --continue runs.

Watch out

Replacing the prompt drops the default tool guidance and safety instructions, so you must add back what your task still needs. Appending is the safer choice when Claude should stay a coding assistant. CLAUDE.md and output style instructions are not inside the system prompt; they reach Claude as system reminders.

Original and official docs

This page explains the term in plain words. The original is the authority: if they differ, follow the original.