◉CLAUDE LABJP
●2.1.309 — Sandbox and permission checks are tighter, and hooks and PowerShell on Windows are fixed (10/22)●2.1.307 — Fixes MCP failing to reconnect after sleep or a keychain lock (10/21). 2.1.306 also fixed the false claude -p login message●SONNET 4.5 — Retires on the Claude API on 11/30, 37 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST MODE — Opus 5.5 fast mode is out of research preview and no longer needs the beta header (10/15)●NEW — I Put a Ten-Line Promise File at the To…●2.1.309 — Sandbox and permission checks are tighter, and hooks and PowerShell on Windows are fixed (10/22)●2.1.307 — Fixes MCP failing to reconnect after sleep or a keychain lock (10/21). 2.1.306 also fixed the false claude -p login message●SONNET 4.5 — Retires on the Claude API on 11/30, 37 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST MODE — Opus 5.5 fast mode is out of research preview and no longer needs the beta header (10/15)●NEW — I Put a Ten-Line Promise File at the To…
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Scheduled jobs

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⬡ API & SDK/2026-06-25Advanced

When the Previous Run Hasn't Finished and the Next One Starts: Leases and Fencing Tokens for Scheduled Agents

A scheduled agent that runs on a fixed clock can overtake itself and start twice. From the moment a naive lock breaks to leases, fencing tokens, and bounded catch-up — worked through with the implementation I actually run.

⬡ API & SDK/2026-06-24Advanced

What I Decided the Day the Ceiling Doubled: A Headroom Budget for Scheduled Jobs on One Shared API Key

Why I did not compress my intervals when the rate limit doubled, and how to design a headroom budget for running several scheduled jobs on one shared API key, with measurement and working code.

⬡ API & SDK/2026-06-16Advanced

Confirm Your Model Actually Responds Before a Scheduled Run Begins

A model you configured can be gone before your nightly job even wakes up. Tell retirement, withdrawal, and regional restriction apart with a single startup probe, then rewrite the run config to an eligible model — with complete, working TypeScript.