Claude Code Fork Subagents: A Headless Migration Runbook
Claude Code fork subagents now reach headless and SDK lanes by default. Test inherited context, nested waits, permissions and failure evidence before promotion.
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Playbooks
Claude Agent SDK Hook Rewrites: Prove the Input That Executes
Claude Agent SDK hook rewrites now undergo input validation. Use migration fixtures to verify executable arguments, preserve approvals and record outcomes.
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OpenAI Legacy User API Keys Shut Off Oct 22: A Key-Migration Drill for Agent Fleets
OpenAI legacy user API keys are reported to stop working Oct 22. Inventory every key your agents read, rotate, canary-prove and revoke by Oct 20, with dates.
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DeepSeek V4 Migration Guide: Life After V3 and R1
DeepSeek deprecated V3 and R1 on July 24, 2026. Migrate to DeepSeek V4 Pro or Flash with real config swaps, an eval-first sequence, and a rollback plan.
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