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### System prompt ### System reminder

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311311Learn more: [Platforms and integrations](/docs/en/platforms)
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313### System prompt
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315The instructions Claude Code sends ahead of your conversation on every request, covering how Claude uses tools, behaves safely, and formats its responses. You can add to the system prompt with `--append-system-prompt` or replace it with `--system-prompt`. The system prompt is the first layer of the [prompt cache](/docs/en/prompt-caching#how-the-cache-is-organized).
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317Your [CLAUDE.md](#claude-md) files and the instructions of your [output style](#output-style) aren't part of the system prompt. Claude Code delivers them in the conversation as [system reminders](#system-reminder).
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319Learn more: [System prompt flags](/docs/en/cli-reference#system-prompt-flags)
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321### System reminder
322 
323A message that Claude Code, as the [harness](#agentic-harness), adds to the conversation to give Claude context. You don't send system reminders yourself. Claude Code inserts them as a session runs, for example when the session starts, when a hook returns text, or when a file changes on disk. Claude reads them alongside your messages. The following all reach Claude as system reminders:
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325* Your [CLAUDE.md](#claude-md) files
326* The instructions of your [output style](#output-style)
327* Text a [hook](#hook) returns as `additionalContext`
328* The list of available [skills](#skill)
329* A note that a file Claude read earlier has changed on disk
330* The commit and pull request attribution lines
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332In a logged API request, a system reminder appears wrapped in `<system-reminder>` tags inside a user message, or on some models as a separate message with the `system` role.
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334Learn more: [Context Claude Code adds outside the system prompt](/docs/en/agent-sdk/modifying-system-prompts#context-claude-code-adds-outside-the-system-prompt)
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313336## T
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315338### Teleport
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