mcp-2026-07-28 SKILL.md skillA
mcp-2026-07-28 from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/mcp-2026-07-28@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/mcp-server-smith/skills/mcp-2026-07-28/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Aug 2, 2026
- Size
- 5,210 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "MCP 2026-07-28", "MCP spec", "Model Context Protocol spec", "stateless MCP", "Streamable HTTP", "HTTP+SSE", "MCP transport", "MCP lifecycle", "MCP capabilities", "MCP Apps", "MCP Tasks", "versioned extensions", "protocolVersion", or building/upgrading an MCP server to the current spec. It provides the 2026-07-28 stateless core, transport, lifecycle, and versioned-extensions model.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# MCP 2026-07-28 Spec ## Purpose The MCP **2026-07-28** specification is the largest revision since the protocol launched. It moves MCP from a bidirectional, stateful protocol toward a **stateless request/response core**, so servers deploy on serverless and edge infrastructure and scale horizontally; it formalizes **versioned extensions** (MCP Apps for interactive UI, Tasks for long-running work) so capabilities can be added without touching the core; and it aligns authorization with production **OAuth 2.1 / OIDC** (covered in the `mcp-authorization` skill). This skill is the reference for the core, transport, and lifecycle so a server is shaped correctly, not merely functional. ## What changed, at a glance | Area | Before | 2026-07-28 | |---|---|---| | Transport | HTTP+SSE dual endpoint (`GET /sse` + `POST /messages`) | **Streamable HTTP**, single endpoint; HTTP+SSE removed | | Core model | Stateful, long-lived bidirectional session | **Stateless request/response** core; each request self-contained | | Deployment | Sticky, single-instance | Serverless / edge / multi-replica behind a load balancer | | Extensions | Ad-hoc | **Versioned extensions** framework (MCP Apps, Tasks) | …
Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/mcp-2026-07-28@sha256:5e26f88a456d9c28The line at the top of this page pins the label git:20260826.571bc2f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_72kbs6ltxyj2qmnr)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 2, 2026 and Aug 26, 2026, about one every 23 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 5,210 B | A | view · diff |
| git:20260802.9f9bd44 | 2026-08-02 | 9f9bd44 | 5,215 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5210 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sigistry/marketplace · 3 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_72kbs6ltxyj2qmnr GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/mcp-2026-07-28 GET https://markdownregistry.com/api/v1/blob/5e26f88a456d9c28e3c2dc2ee93d2b28f117e5bb462dee38c5b0d0d52cf6f0a2
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.