--- title: MCP 2.0 Is Mostly Deletion. That’s The Good Part | daily.dev description: MCP's 2026-07-28 release candidate (dubbed MCP 2.0) makes a deliberate breaking change: it removes the session entirely. Gone are the initialize handshake,... canonical: https://daily.dev/posts/mcp-2-0-is-mostly-deletion-that-s-the-good-part-l9muhssho twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: MCP 2.0 Is Mostly Deletion. That’s The Good Part | daily.dev og:description: MCP's 2026-07-28 release candidate (dubbed MCP 2.0) makes a deliberate breaking change: it removes the session entirely. Gone are the initialize handshake,... og:url: https://daily.dev/posts/mcp-2-0-is-mostly-deletion-that-s-the-good-part-l9muhssho og:image: https://api.daily.dev/og/posts/l9mUHSSHo.png og:image:alt: MCP 2.0 Is Mostly Deletion. That’s The Good Part og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # MCP 2.0 Is Mostly Deletion. That’s The Good Part **[ITNEXT](https://daily.dev/sources/itnext)** · 16 min read · 0 upvotes · 0 comments ## Summary MCP's 2026-07-28 release candidate (dubbed MCP 2.0) makes a deliberate breaking change: it removes the session entirely. Gone are the initialize handshake, Mcp-Session-Id, GET SSE endpoint, resumable streams, resources/subscribe, and more. The core becomes stateless — every request is self-describing, carrying protocol version and client capabilities in _meta and a mandatory MCP-Protocol-Version header. State that used to live in sessions now travels as explicit IDs in tool arguments (e.g., basket_id, issue_id), which is how most real-world servers already behave. Analysis of 1,000 open-source MCP servers shows 90% never used session IDs at all. The release also introduces: a Multi Round-Trip Request pattern replacing held-open SSE streams for mid-call questions; an extensions framework with namespaced capabilities for shipping experimental features outside core; a rebuilt Tasks API demoted to an extension after production feedback; sandboxed UI rendering via ui:// scheme in iframes; six OAuth 2.1 hardening changes; and operational improvements like W3C Trace Context, Mcp-Method/Mcp-Name headers, improved caching with ttlMs/cacheScope, and a formal deprecation policy with a 12-month floor. Migration impact varies: stdio-only servers need a dependency bump, gateway-backed servers need real work, and experimental Tasks users face a rewrite. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [MCP is now stateless: what the 2026-07-28 update changes](https://daily.dev/posts/mcp-is-now-stateless-what-the-2026-07-28-update-changes-hc2vhg5ll) · Flavio Copes · 9 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#mcp](https://daily.dev/tags/mcp), [#distributed-systems](https://daily.dev/tags/distributed-systems), [#oauth](https://daily.dev/tags/oauth) [View this post on daily.dev](https://daily.dev/posts/mcp-2-0-is-mostly-deletion-that-s-the-good-part-l9muhssho) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"MCP 2.0 Is Mostly Deletion. 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