Claude Code gains parallel execution, workflow orchestration, and MCP integrations

According to GitHub repositories, developers are building infrastructure extending Claude Code with new capabilities: Shikigami enables parallel execution of multiple coding agent instances using Git worktrees for concurrent feature and bug development; gpt-workflow provides deterministic multi-agent workflows with control flow and task delegation; and domain-specific integrations like a Pexels API skill and effort-router plugin are emerging. An effort-router tool automatically adjusts reasoning level per request to optimize token usage.