# MCP spec: 2026-07-28 release candidate published

> A release candidate for the Model Context Protocol's 2026-07-28 revision is available in draft form. The spec is explicitly not final and may change before the stable release; SDKs adopt on their own schedule and the prior revision stays in use for an undetermined period.

| | |
|---|---|
| **Tool** | MCP specification |
| **Version** | 2026-07-28-RC |
| **Kind** | spec_revision |
| **Published** | 2026-05-29 |
| **Observed** | 2026-08-11 |
| **Significance** | 3/5 |
| **Breaking** | no |
| **Categories** | api-change, docs |

> **Note:** this classification is below our confidence threshold and is pending human review.

## What changed


- `2026-07-28` published as a release candidate, in draft form.
- Source states changes may still land between RC and final.
- SDKs adopt at their own pace; prior spec revision remains in use indefinitely.
- Clients and servers settle on a revision via the spec's version negotiation.
- Change detail is in a linked draft changelog, not this note.


## Sources

- [github_release](https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28-RC) — retrieved 2026-08-11

## Community

_No curated reactions recorded. Facts and community takes are kept in separate layers
and never blended._

---
Canonical: https://changelogs.info/mcp-spec/2026-07-28-rc
Entity: https://changelogs.info/mcp-spec
Event ID: `evt_2026-05-29_mcp-spec_2026-07-28-rc`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.