Ranked by AI agent readiness across MCP, API, CLI, Skills, and Docs.
Realtime pub/sub with MCP built into CLI (ably mcp start-server), dual REST APIs with OpenAPI specs, @ably/cli with --json, official agent-skills repo (2 skills + Claude Code plugin), and llms.txt + copy-as-markdown + AI Transport quickstart
Communication APIs with official MCP server (alpha), comprehensive REST API with OpenAPI spec, powerful CLI with JSON output, and llms.txt support
WhatsApp Business API with hosted MCP (22+ tools), REST API with 3 OpenAPI specs, 3 agent skills, but no CLI