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Glossary · Learn more

System reminder

adds to the conversation for . 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
Purple sticky notes drift into a stack of letters on a desk, tucked between them as hints.

What it is

A system reminder is a message that , as the , adds to the conversation to give . You never send one yourself. Claude Code inserts them while a session runs, for example when the session starts, when a hook returns text, or when a file changes on . Claude reads them next to your messages, and Claude Code tells Claude they come from the application, not from you.

How it works

  1. Something happens in the session
  2. Claude Code writes a short note
  3. The note joins the conversation
  4. Claude reads it with your message

How to use it

  1. CLAUDE.md

    your project instructions reach Claude as a reminder, introduced with a line saying they override default behavior.

  2. additionalContext

    text a hook returns arrives as a reminder.

  3. and — the list of names and descriptions Claude can call comes this way.

  4. File-changed notes — Claude learns that a file it read earlier was changed on disk.

Watch out

Reminders are not part of the , so most of them still arrive even when you replace the system prompt. You cannot see them in the message stream; to check them, log the requests Claude Code sends. In a logged request a reminder appears inside <system-reminder> tags in a user message, or on some as a separate message with the system role.

Original and official docs

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