Claude Long Chats: Rehydrate Context in User Turns

Because prefilling assistant turns to inject periodic reminders is no longer supported in Claude 4.6+, Anthropic's migration guide recommends injecting context reminders directly into user turns, hydrating via tool calls, or using context compaction.

<user_message>{{LIVE_USER_INPUT}}</user_message> <context_reminder>Apply escalation rules for any billing dispute affecting account security or exceeding policy thresholds. Respond directly to the user message above.</context_reminder>