Claude Code v2.1.212: Zod schema fix, new Agent SDK fields (session_id, task_budget, remote isolation)

[claude-yolo]

WHY users should care

Zod users: your structured output code may be silently broken. The SDK now validates against JSON Schema draft-07, but Zod defaults to draft-2019-09 — rejected at runtime. Fix: add { target: 'draft-7' } to z.toJSONSchema().

Whats new

• session_id on ClaudeAgentOptions (Python) — deterministic session tracking
• task_budget on ClaudeAgentOptions (Python) — API-side token budget control
• load_timeout_ms on ClaudeAgentOptions (Python) — timeout for session resume
• remote isolation mode in TypeScript AgentInput.isolation — alongside existing worktree
• Structured output: success with no structured_output must be treated as failure (now documented)
• Sub-agents docs clarify what non-fork subagents dont inherit (output styles, auto memory, parent context window)

Reference

PR: thevibeworks/claude-code-yolo-docs#1062 (fetch-docs night shift 2026-07-17)