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128128A new instruction applies to sessions started after you save it. Claude reads it in every new thread right away, keeps the old text in a thread that's already running, and picks it up at the channel's top level on the next channel message, when it replaces the channel's session (see [Attach the bundle](#attach-the-bundle)). Claude doesn't read a channel's instructions in another channel or in a DM. To confirm what a session is reading, start a new thread and ask Claude to repeat its admin instructions.
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130To let a central team write a channel's instructions from its own Slack channel, see [Manage a channel's instructions from another channel](/docs/claude-tag/admins/managed-by).
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130132### Restrict who can set channel instructions
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132134By default, anyone in a channel who is also a member of your Claude organization can edit that channel's instructions from the **Configure** link in Claude's reply footer. The **Channel member edits** setting in a scope's **Advanced** settings controls this.