The current Model Context Protocol (MCP) version is 2026-07-28, and the official changelog for that revision marks HTTP+SSE as deprecated, with Streamable HTTP as the direction for implementations. A guide that presents HTTP+SSE as the current remote transport is out of date on that point. The guide at the center of this question, identified in a published article as guide #133, was not inspected here, so its specific claims are reported as the article makes them.
What the version identifier tells you
MCP’s official versioning documentation names 2026-07-28 as the current protocol version. Version identifiers use the YYYY-MM-DD format and record the date of a backwards-incompatible change. Backwards-compatible updates do not, by themselves, produce a new identifier.
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Two consequences follow for anyone maintaining a guide. First, a page that names an older date, or names no version at all, cannot be assumed to reflect the current revision. Second, a feature’s lifecycle label is separate from the revision number. Deprecated features stay in the specification during a deprecation window and are scheduled for eventual removal, so a deprecation notice is a signal to change guidance even though the feature still exists in the spec text.
The transport correction
The official 2026-07-28 changelog lists HTTP+SSE among the deprecated features and directs implementations toward Streamable HTTP. For a guide, the practical checks are:
- Does the transport section name Streamable HTTP as the remote transport, or does it describe HTTP+SSE as the default?
- If HTTP+SSE is mentioned, is it labelled as deprecated, with a pointer to the replacement?
- Do setup steps, endpoint paths, or sample code assume the older transport?
A guide that names HTTP+SSE as current is wrong on the official record, not merely behind on wording. That is the strongest claim in the article, and it is the one that can be checked directly against the changelog.
Why a transport label is not the whole update
Replacing a transport name does not finish the job. The same changelog describes changes to the protocol’s session model and handshake, and those changes affect code examples and architectural explanations. The maintainers, David Soria Parra and Den Delimarsky, summarized the release in the official release announcement dated July 28, 2026: “The 2026-07-28 Model Context Protocol specification is out, bringing a stateless protocol core, Multi Round-Trip Requests, header-based routing, cacheable list results, authorization hardening, a formal extensions framework, and updated Tier 1 SDKs.”
Rank #2
The changelog’s specific items are summarized below, with what a maintainer should look for in older guidance.
| Area | What the 2026-07-28 changelog says | What to check in an older guide |
|---|---|---|
| Protocol-level sessions | Removed from Streamable HTTP, including the Mcp-Session-Id header |
Examples that create, store, or send a session ID, or that explain connection-scoped state as a protocol feature |
| Initialization | The initialize / notifications/initialized exchange is removed |
Walkthroughs that start with a handshake before any request |
| Version and capabilities | Carried in _meta on every request |
Text that says version or capabilities are negotiated once per connection |
| Deprecated features | Roots, Sampling, Logging, HTTP+SSE, and selected includeContext values are marked deprecated |
Whether each deprecated feature is presented as current, and whether a replacement is named |
The practical lesson is that an update should review examples and assumptions, not only the transport label. A guide can name Streamable HTTP correctly and still teach a session flow that the revision no longer uses.
Rank #3
What the article says about guide #133
The article that matches this title, by Robert and posted on dev.to on September 24, 2026 (originally published at neuragrowth.co), reports that a product freshness check flagged guide #133 for three changes across sections 2 and 9. Two are described as material. The article’s transport allegation is that the guide still presents HTTP/SSE as current. Robert writes:
When the MCP spec replaces a transport, any guide, codebase or README that names the old one as current becomes actively misleading rather than just outdated.
Three limits apply to these claims:
- The transport status of HTTP+SSE is confirmed by the official changelog. The guide’s exact wording and section numbers are reported only by the article.
- The article’s second material point and its section references are likewise reported only by the article, and cannot be independently confirmed from the official MCP documentation.
- The article also says the guide is sold on Etsy and Gumroad and carries an update-needed status that triggers targeted rewriting and an “Updated” note. These are the article’s statements about a commercial product, not verified details of a live listing or its current contents.
The n8n max-iterations claim is unresolved
The article’s third issue concerns a different kind of claim. It says the guide recommends a max-iterations range of 3–5 and that this conflicts with n8n’s current guidance. The article does not state what n8n now recommends, or when that guidance changed, so the available evidence does not establish a current number or a date.
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A maintenance checklist for MCP guides
- Record the protocol version the guide targets. If it does not name a revision, add one and check it against the versioning documentation.
- Search for every mention of HTTP+SSE and confirm each one is labelled deprecated or removed. Replace default-transport language with Streamable HTTP guidance.
- Search for
Mcp-Session-Id, session creation, and theinitializeexchange. Rewrite examples so they match the stateless core and the_metaplacement. - Check every use of Roots, Sampling, Logging, and
includeContextagainst the deprecation list in the changelog. - For any recommendation drawn from outside the MCP specification, such as a product’s iteration limit, attach a dated primary source. If none exists, say so instead of presenting the number as current.
- Re-check the version and deprecation status when a later revision is published, since protocol versions and feature labels change over time.
The release announcement, changelog, and versioning page are the three official references for the MCP side of this audit. Each guide’s own claims still need checking against them one line at a time.
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