Claude Agent SDK April Updates: Python Gets MCP Tool Annotations, TypeScript Gets Progress Summaries and Task Budgets

GitHub / Anthropicmedium signal

Anthropic's Claude Agent SDK received notable updates across both language SDKs. Python SDK now supports MCP tool annotations via @tool decorator (readOnlyHint, destructiveHint, idempotentHint, openWorldHint), fixed silent failures for large agent definitions by routing payloads through stdin, and added version validation for Claude Code 2.0.0+. TypeScript SDK adds agentProgressSummaries for periodic AI-generated progress updates on running subagents, taskBudget for API-side token budget awareness, getSettings() with runtime-resolved model/effort values, reloadPlugins() for live plugin refresh, and MCP elicitation hook types for programmatic server input handling.

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Claude Agent SDK April Updates: Python Gets MCP Tool Annotations, TypeScript Gets Progress Summaries and Task Budgets | MindPattern