Claude Agent SDK 0.3.317

What's changed

• Added onFailure to hook matchers: with "block", a hook that throws or returns invalid output blocks the action
• Added a warning message in the stream when a hook callback fails
• Added a session_writes_lost system message, sent after the last result when a full disk or disk quota kept the CLI from saving the session transcript or ~/.claude.json
• Added initialize_not_first to startup_failure_reason, for a --await-initialize launch whose first stdin line is not the initialize request
• Added task.description to the TaskCreate tool's tool_use_result: the description the task was created with
• Added lossy to readFile() utf-8 answers: true when decoding replaced bytes that are not valid UTF-8
• Removed the file_unchanged variant of FileReadOutput in sdk-tools.d.ts; a repeated Read now returns the file content
• Fixed setMcpServers closing a folder's .mcp.json and local-scope MCP servers in sessions started with prewarm() and bound with SpareProcess.claim()
• Updated to parity with Claude Code v2.1.317

Update

npm install @anthropic-ai/claude-agent-sdk@0.3.317
# or
yarn add @anthropic-ai/claude-agent-sdk@0.3.317
# or
pnpm add @anthropic-ai/claude-agent-sdk@0.3.317
# or
bun add @anthropic-ai/claude-agent-sdk@0.3.317