◉CLAUDE LABJP
●2.1.296 — Subagents can set their own autoCompactWindow, and an env var pins the model used by workflow agents●AGENTS — Managed Agents gain dynamic workflows in beta: an agent can build a run for work with many pieces (Oct 9)●SONNET 4.5 — Retires on the Claude API on 11/30, 50 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: Max plan users hit usage limits almost immediately●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — Before you cut an always-loaded instruction file in half, sort it into three drawers●2.1.296 — Subagents can set their own autoCompactWindow, and an env var pins the model used by workflow agents●AGENTS — Managed Agents gain dynamic workflows in beta: an agent can build a run for work with many pieces (Oct 9)●SONNET 4.5 — Retires on the Claude API on 11/30, 50 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: Max plan users hit usage limits almost immediately●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — Before you cut an always-loaded instruction file in half, sort it into three drawers
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⬡ API & SDK/2026-07-08Advanced

Rolling Out Agent Behavior Changes Gradually with Feature Flags

When an unattended agent changes its prompt or behavior all at once, quiet regressions hide until morning. Here is a design for assigning new behavior to only a fraction of runs, keeping a control group, and adding deterministic bucketing, canary comparison, and automatic rollback.

⬡ API & SDK/2026-07-05Intermediate

Don't Let the Opus 4.7 Fast Mode Retirement (July 24) Kill Your Unattended Jobs

claude-opus-4-7 fast mode retires on 2026-07-24, and speed: fast starts throwing errors. Here's how to keep unattended pipelines from breaking silently: mechanically detect where fast mode is used, add a fail-closed runtime guard, and migrate to 4.8 with working code.