Connect Tools and MCP Servers to CrewAI Agents

Give an agent working tools - custom Python, prebuilt crewai_tools, or MCP servers - without the 0.x-era mistakes that fail silently.

Verified against crewai 1.15.22 and 1.15.23 on 2026-10-01. Live-tested on CrewAI AMP and real LLMs on 2026-10-01. Run crewai version first; if the major/minor differs from 1.15, re-verify version-sensitive rows with the ask-docs skill before trusting them.

1. Pick the mechanism