◉CLAUDE LABJP
●2.1.302 — Fork subagents are now on by default in claude -p, the Agent SDK and the desktop app. Turn them off with CLAUDE_CODE_FORK_SUBAGENT=0 (10/16)●2.1.301 — Unattended retries now stop on their own when a usage limit is hit instead of waiting (10/15). Latest is 2.1.304 (10/19)●SONNET 4.5 — Retires on the Claude API on 11/30, 40 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…●2.1.302 — Fork subagents are now on by default in claude -p, the Agent SDK and the desktop app. Turn them off with CLAUDE_CODE_FORK_SUBAGENT=0 (10/16)●2.1.301 — Unattended retries now stop on their own when a usage limit is hit instead of waiting (10/15). Latest is 2.1.304 (10/19)●SONNET 4.5 — Retires on the Claude API on 11/30, 40 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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⬡ API & SDK/2026-05-26Advanced

Stabilizing Claude API Structured Responses in Production — Notes on tool_use, JSON Schema, and Layered Validation

Getting Claude to return JSON takes a few lines. Keeping that JSON usable in production is a different problem. Here is the layered design I landed on after running a wallpaper classification pipeline through Claude API, built around tool_use, JSON Schema, and domain validation.

⬡ API & SDK/2026-05-09Advanced

A Five-Layer Preflight Design for Claude API — How I Cut Hundreds of 400/422/529 Errors to Zero

A production-tested five-layer preflight design that catches Claude API failures before the network call — schema, token budget, model capability, content policy, and spend cap — with full TypeScript implementation and one month of operational numbers.