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Your Hook Says "Blocking Error" But the File Still Changed? PostToolUse and PreToolUse Don't Actually Block the Same Way  ·  Enabled Auto Mode and Thought You Were Safe? Permission Modes and Sandbox Boundaries Are Two Different Layers — Conflating Them Is How Things Break  ·  Messages API Adds On-Demand Compaction in Beta: Developers Decide When to Compact, Not the System  ·  Claude Cowork and Chat Officially Merge, Launching Claude Docs and Claude Slides Alongside It  ·  Why a Single "hi" Can Burn 20,000+ Tokens in Claude Code: Breaking Down the Fixed Startup Overhead  ·  How to Write Your First Custom Slash Command in Claude Code: A Working Example From Scratch
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Messages API Adds On-Demand Compaction in Beta: Developers Decide When to Compact, Not the System

Compaction timing is no longer the system's call — developers now decide when history gets condensed.
Adrian Koch · September 18, 2026
The official Claude Platform release notes added an entry on September 14, 2026: the Messages API can now compact a conversation on the server side at a moment the developer chooses, currently open for testing under the compact-2026-09-04 beta header. This feature extends the Compaction API that's existed since February 2026, but explicitly hands control over the triggering moment from...
Latest News
Claude Cowork and Chat Officially Merge, Launching Claude Docs and Claude Slides Alongside It
Bring a quick question, or hand over a report — even after you close your...
Latest News
Claude Code Adds Owner-Wildcard Marketplace Controls, Letting One Rule Allow or Block an Entire GitHub Org
An allowlist policy nobody can keep up with is effectively no policy at all...
Latest News
New MCP Spec Ships: Connectors No Longer Need to Maintain Session State, Claude's Directory Passes 950 Servers
Connectors no longer having to manage their own connection state sounds...
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Starting August 14, Claude Code Defaults New Sessions to Auto Mode — You Might Not Notice the Switch
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Auto Mode doesn't remove the gatekeeping — it just...
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"Compaction timing is no longer the system's call — developers now decide when history gets condensed."
— Claude Skill Me
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