Slack's current documentation names this capability the Slack MCP and Skills Plugin. It is designed to improve AI-assisted and agent-assisted Slack development by supplying coding agents with specialized Slack development skills and, on supported clients, a connection to the Slack MCP Server. The skills provide focused instructions and references for tasks such as scaffolding Slack apps, validating Block Kit objects, composing messages, calling Web API methods, and using Slack CLI functionality. The MCP Server can additionally allow supported AI tools to interact with workspace data, including searching channels, sending messages, and managing canvases. Slack documents support for tools such as Claude Code, Codex, Cursor, and other coding agents, with capabilities varying by client. It does not replace Slack CLI or exist solely for OAuth. Therefore, A is correct.