●2.2553.0 — Claude Desktop and Cowork both shipped over the weekend. Connector and extension tools no longer fail when an optional argument is left out●COMPACT — The Messages API gained a compaction parameter. Behind the compact-2026-09-04 beta header, you can now compress a conversation on your own schedule●10/07 — The old management-configuration key spellings are accepted until noon PT on October 7, sixteen days away. Move your fleet past 1.15200.0 before switching orgPluginSettings to the array form●GH.LINK — Cowork shows the GitHub integration as authenticated, yet there is no way to use it: it never registers as a connector●NEW — You are paying for Pro but no charges appear in the Console. Here is where to look●KB5129195 — September Windows updates that stopped Cowork from reaching files are fixed by Microsoft KB5129195. No Claude Desktop update is needed●2.2553.0 — Claude Desktop and Cowork both shipped over the weekend. Connector and extension tools no longer fail when an optional argument is left out●COMPACT — The Messages API gained a compaction parameter. Behind the compact-2026-09-04 beta header, you can now compress a conversation on your own schedule●10/07 — The old management-configuration key spellings are accepted until noon PT on October 7, sixteen days away. Move your fleet past 1.15200.0 before switching orgPluginSettings to the array form●GH.LINK — Cowork shows the GitHub integration as authenticated, yet there is no way to use it: it never registers as a connector●NEW — You are paying for Pro but no charges appear in the Console. Here is where to look●KB5129195 — September Windows updates that stopped Cowork from reaching files are fixed by Microsoft KB5129195. No Claude Desktop update is needed

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claude-api¹ prompt-caching¹ cache-control¹ cost-optimization¹ claude-code¹ fallbackmodel¹ automation¹ reliability¹

⬡ API & SDK/2026-06-24Advanced

My Morning Batch Was Missing the Prompt Cache Every Time — Warming Cadence and the Break-Even Math for the 1-Hour TTL

Jobs that run a few hours apart cold-miss the prompt cache even with a 1-hour TTL. Here is how to back out the right warming interval from the TTL, and how to write the break-even formula that decides whether warming pays off — with numbers from a four-site daily generation pipeline.

⟐ Claude Code/2026-06-12Intermediate

A Three-Tier fallbackModel Setup for Claude Code — Keeping Unattended Runs Alive Through Overload Mornings

How I run Claude Code with a three-tier fallbackModel chain so overnight batches survive overload errors: logging which model actually ran, measuring quality drift on fallback days, and pairing it with deny rules.