CrewAI 1.15.8 adds WaitTool for long-running agent jobs

Full analysis

CrewAI released version 1.15.8, introducing a WaitTool that allows agents to pause execution while waiting for long-running background jobs to complete — a useful primitive for agentic workflows that need to coordinate with slow external processes. The release also fixes the FileWriterTool and marks the E2B_API_KEY (used for sandboxed code execution via the E2B platform) as a required environment variable for E2B-based tools, tightening configuration validation.