◉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)●2.1.307 — 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, 38 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)●2.1.307 — 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, 38 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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Programmatic Tool Calling

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Claude API2Tool Use1advanced1tool use1agents1production1
⬡ API & SDK/2026-03-23Advanced

Claude API Programmatic Tool Calling (PTC) Production Guide — 10x Faster Multi-Tool Workflows

Master Programmatic Tool Calling (PTC) in the Claude API to dramatically reduce latency and token costs in multi-tool workflows. Learn production patterns combining PTC with Tool Search and Input Examples.

⬡ API & SDK/2026-03-19Advanced

Claude API Advanced Tool Use: Tool Search, Programmatic Tool Calling, and Tool Use Examples

A working walkthrough of Claude API's Tool Search Tool, Programmatic Tool Calling, and Tool Use Examples — starting with the beta header that everything depends on, plus how to read Anthropic's published reduction figures and when to skip each feature.