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HomeDocsClaude Code CLI 28 Sep 2026
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How Claude Code works changedhow-claude-code-works

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#### Context Claude Code adds on its own

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119119For an interactive walkthrough of what loads and when, see [Explore the context window](/docs/en/context-window).
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121#### Context Claude Code adds on its own
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123If Claude follows a rule you didn't write, such as adding a `Co-Authored-By` trailer to a commit, the rule may have come from a [system reminder](/docs/en/glossary#system-reminder). As you work, Claude Code adds its own context to the conversation alongside your messages:
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125* Your CLAUDE.md files
126* The instructions of your [output style](/docs/en/output-styles)
127* A note when a file Claude read earlier changes on disk
128* The commit and pull request attribution lines
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130To change or remove the attribution lines, set [`attribution`](/docs/en/settings-reference#attribution). To remove Claude Code's built-in commit and pull request instructions, set [`includeGitInstructions`](/docs/en/settings-reference#includegitinstructions) to `false`. For the other switches, see [Turn off the context your agent replaces](/docs/en/agent-sdk/modifying-system-prompts#turn-off-the-context-your-agent-replaces).
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121132#### When context fills up
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123134Claude Code manages context automatically as you approach the limit. It clears older tool outputs first, then summarizes the conversation if needed. Your requests and key code snippets are preserved; detailed instructions from early in the conversation may be lost. Put persistent rules in CLAUDE.md rather than relying on conversation history.
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