Claude Agent SDK 0.3.299

What's changed

• Added an optional nextFireAt (epoch ms of the next run) to the CronCreate and CronList tool outputs
• Added property_order to the elicitation control request: a form's field names in the order the MCP server listed them, for hosts whose transport keeps no JSON object key order
• Fixed rewind_conversation answering "target not found" for a message stopped during its prompt hooks or plugins: until a reply or input follows, it answers rewound: true with a null prefillText
• Fixed in-process SDK MCP servers named constructor or toString being silently dropped when a prewarm() process is claimed with SpareProcess.claim()
• Fixed queued user messages with content-block arrays running together without a line break when merged into one turn
• Fixed origin.body on a user message that merges several queued peer messages (from other sessions or agents) carrying only the first message's text; it is now omitted
• Changed initialize, mcp_set_servers and claim_session to refuse the reserved MCP server names __proto__, __defineGetter__, __defineSetter__, __lookupGetter__, __lookupSetter__
• Updated to parity with Claude Code v2.1.299

Update

npm install @anthropic-ai/claude-agent-sdk@0.3.299
# or
yarn add @anthropic-ai/claude-agent-sdk@0.3.299
# or
pnpm add @anthropic-ai/claude-agent-sdk@0.3.299
# or
bun add @anthropic-ai/claude-agent-sdk@0.3.299