●2.1.289 — Claude Code 2.1.289 (Oct 3) fixes deny/ask rules on nested parts of compound shell commands, a terminal freeze, and Read deny through symlinks●10/07 — 1 day left until the old spellings of Claude Desktop / Cowork managed-config keys stop being accepted. After the cutoff they fail closed●ACCOUNTS — A request to switch between multiple accounts in Claude Desktop has gathered over 200 comments on GitHub. How far today's workarounds go is the real question●NEW — When Claude Code committed despite a no-commit instruction, I separated the cause with a deny rule and a PreToolUse hook●COMPARE — A Zenn post compares Opus 5.5 and Sonnet 5.5 with numbers. The real question is where to draw the line per job●SONNET5.5 — Code written for Sonnet 5 can break on 5.5 in five ways. Thinking settings and forced tool_choice are the places to check first●2.1.289 — Claude Code 2.1.289 (Oct 3) fixes deny/ask rules on nested parts of compound shell commands, a terminal freeze, and Read deny through symlinks●10/07 — 1 day left until the old spellings of Claude Desktop / Cowork managed-config keys stop being accepted. After the cutoff they fail closed●ACCOUNTS — A request to switch between multiple accounts in Claude Desktop has gathered over 200 comments on GitHub. How far today's workarounds go is the real question●NEW — When Claude Code committed despite a no-commit instruction, I separated the cause with a deny rule and a PreToolUse hook●COMPARE — A Zenn post compares Opus 5.5 and Sonnet 5.5 with numbers. The real question is where to draw the line per job●SONNET5.5 — Code written for Sonnet 5 can break on 5.5 in five ways. Thinking settings and forced tool_choice are the places to check first

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model-availability

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claude-api² fallback² error-handling² troubleshooting¹ production¹

⬡ API & SDK/2026-05-22Intermediate

Designing a Model-Selection Fallback That Survives this model is currently unavailable on Claude API

When Claude API answers 'this model is currently unavailable', treating it like a 529 Overloaded or a rate limit sends you the long way round. Here is how I tell the rejections apart by SDK exception class, switch model IDs per request, and the assumptions I had to fix along the way.

⬡ API & SDK/2026-06-28Advanced

A Silent Drop to a Weaker Model Is Scarier Than an Error: Designing a Capability Floor for Claude API Fallback

When a model becomes unavailable in an unattended pipeline, automatically dropping to a weaker model is dangerous. Drawing on years of running automated indie pipelines, this is how to use per-task capability contracts and a degradation budget to decide where to stop.