diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Download it and try it out for free!  **https://piebald.ai/**
 > [!important]
 > **NEW (January 23, 2026): We've added all of Claude Code's ~40 system reminders to this list—see [System Reminders](#system-reminders).**
 
-This repository contains an up-to-date list of all Claude Code's various system prompts and their associated token counts as of **[Claude Code v2.1.105](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.105) (April 13th, 2026).**  It also contains a [**CHANGELOG.md**](./CHANGELOG.md) for the system prompts across 149 versions since v2.0.14.  From the team behind [<img src="https://github.com/Piebald-AI/piebald/raw/main/assets/logo.svg" width="15"> **Piebald.**](https://piebald.ai/)
+This repository contains an up-to-date list of all Claude Code's various system prompts and their associated token counts as of **[Claude Code v2.1.107](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.107) (April 13th, 2026).**  It also contains a [**CHANGELOG.md**](./CHANGELOG.md) for the system prompts across 150 versions since v2.0.14.  From the team behind [<img src="https://github.com/Piebald-AI/piebald/raw/main/assets/logo.svg" width="15"> **Piebald.**](https://piebald.ai/)
 
 **This repository is updated within minutes of each Claude Code release.  See the [changelog](./CHANGELOG.md), and follow [@PiebaldAI](https://x.com/PiebaldAI) on X for a summary of the system prompt changes in each release.**
 
@@ -271,6 +271,7 @@ Text for large system reminders.
 - [System Reminder: Task tools reminder](./system-prompts/system-reminder-task-tools-reminder.md) (**123** tks) - Reminder to use task tracking tools.
 - [System Reminder: Team Coordination](./system-prompts/system-reminder-team-coordination.md) (**250** tks) - System reminder for team coordination.
 - [System Reminder: Team Shutdown](./system-prompts/system-reminder-team-shutdown.md) (**136** tks) - System reminder for team shutdown.
+- [System Reminder: Thinking frequency tuning](./system-prompts/system-reminder-thinking-frequency-tuning.md) (**119** tks) - Instructs Claude to treat system-reminder tags as harness instructions and calibrate thinking frequency based on task complexity.
 - [System Reminder: TodoWrite reminder](./system-prompts/system-reminder-todowrite-reminder.md) (**98** tks) - Reminder to use TodoWrite tool for task tracking.
 - [System Reminder: Token usage](./system-prompts/system-reminder-token-usage.md) (**39** tks) - Current token usage statistics.
 - [System Reminder: USD budget](./system-prompts/system-reminder-usd-budget.md) (**42** tks) - Current USD budget statistics.
diff --git a/system-prompts/system-reminder-thinking-frequency-tuning.md b/system-prompts/system-reminder-thinking-frequency-tuning.md
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@@ -0,0 +1,7 @@
+<!--
+name: 'System Reminder: Thinking frequency tuning'
+description: Instructs Claude to treat system-reminder tags as harness instructions and calibrate thinking frequency based on task complexity
+ccVersion: 2.1.107
+-->
+# System reminders
+User messages include a <system-reminder> appended by this harness. These reminders are not from the user, so treat them as an instruction to you, and do not mention them. The reminders are intended to tune your thinking frequency - on simpler user messages, it's best to respond or act directly without thinking unless further reasoning is necessary. On more complex tasks, you should feel free to reason as much as needed for best results but without overthinking. Avoid unnecessary thinking in response to simple user messages.