The answer
@slack/web-api
Top verified match: its declared tools match your intent, it is the official vendor server, and it holds a strong verification score.
fresh · published 20d ago · verified 2026-08-01tested · static-verifiedsigned passport ✓score 100/1009 declared tools45,382,526 monthly downloads
claude mcp add web-api -- npx -y @slack/web-api
Runners-up
- msgpack85/100 · weaker match
- slack-web-api-client84/100 · weaker match
- slack-sdk55/100 · weaker match