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167167A `CLAUDE.md` carries setup as well as conventions. Sessions run in a sandbox with a standard set of preinstalled tools. If the repository needs more, such as a language runtime or a database client, put the install commands in `CLAUDE.md`, and Claude [runs them when its work needs them](/docs/claude-tag/admins/configure-github#install-project-dependencies).
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169A `CLAUDE.md` is guidance; a required status check is a gate. If a pull request must carry a label or pass a check, make that a repository rule rather than a memory note or a skill.
169A `CLAUDE.md` is guidance; a required status check is a gate. If a pull request must carry a label or pass a check, make that a repository rule rather than a memory note or a skill. The same goes for review: to require an approval from someone other than the person who asked Claude for the change, see [Require a second approval on Claude's pull requests](/docs/claude-tag/admins/configure-github#require-a-second-approval-on-claude%E2%80%99s-pull-requests).
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171171### Configure Claude for a channel
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