docs: recategorize Tasks as a protocol extension #3036

Where was this agreed?

Requested by maintainer David Soria Parra as part of preparing the modelcontextprotocol.io documentation for the 2026-07-28 specification release.

Description

Tasks were introduced experimentally and have moved to an official extension for the 2026-07-28 spec release. Docs still list Tasks as a core (experimental) utility.

Files to update:

• docs/docs/learn/architecture.mdx — stop listing "Tasks (Experimental)" as a core utility (line 140); link /extensions/tasks/overview
• docs/community/sdk-tiers.mdx — recategorize Tasks (line 28) as a protocol extension alongside MCP Apps

Part of the 2026-07-28 release documentation tracking (milestone: 2026-07-28 Specification Release).