The Agent SDK's default binary resolution picks the musl-linked native binary (claude-agent-sdk-linux-arm64-musl), which cannot execute on the Debian-based container image (glibc). Explicitly set pathToClaudeCodeExecutable to /pnpm/claude — the pnpm global symlink that resolves to the correct glibc binary regardless of architecture. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>