High-level changelog

Author: jspahrsummers

docs/specification/2025-03-26/architecture/_index.md

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 The Model Context Protocol (MCP) follows a client-host-server architecture where each

docs/specification/2025-03-26/basic/_index.md

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 {{< callout type="info" >}} **Protocol Revision**: 2025-03-26 {{< /callout >}}

docs/specification/2025-03-26/changelog.md

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+---
+title: Key Changes
+type: docs
+weight: 5
+---
+
+This document lists changes made to the Model Context Protocol (MCP) specification since
+the previous revision, [2024-11-05]({{< ref "../2024-11-05" >}}).
+
+## Major changes
+
+1. Added a comprehensive **[authorization framework]({{< ref "basic/authorization" >}})**
+   based on OAuth 2.1 (PR
+   [#133](https://github.com/modelcontextprotocol/specification/pull/133))
+1. Replaced the previous HTTP+SSE transport with a more flexible **[Streamable HTTP
+   transport]({{< ref "basic/transports#streamable-http" >}})** (PR
+   [#206](https://github.com/modelcontextprotocol/specification/pull/206))
+1. Added support for JSON-RPC **[batching](https://www.jsonrpc.org/specification#batch)**
+   (PR [#228](https://github.com/modelcontextprotocol/specification/pull/228))
+1. Added comprehensive **tool annotations** for better describing tool behavior, like
+   whether it is read-only or destructive (PR
+   [#185](https://github.com/modelcontextprotocol/specification/pull/185))
+
+## Other schema changes
+
+- Added `message` field to `ProgressNotification` to provide descriptive status updates
+- Added support for audio data, joining the existing text and image content types
+- Added `completions` capability to explicitly indicate support for argument
+  autocompletion suggestions
+
+See
+[the updated schema](http://github.com/modelcontextprotocol/specification/tree/main/schema/2025-03-26/schema.ts)
+for more details.
+
+## Full changelog
+
+For a complete list of all changes that have been made since the last protocol revision,
+[see GitHub](https://github.com/modelcontextprotocol/specification/compare/2024-11-05...2025-03-26).

docs/specification/2025-03-26/client/_index.md

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 {{< callout type="info" >}} **Protocol Revision**: 2025-03-26 {{< /callout >}}

docs/specification/2025-03-26/server/_index.md

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 title: Server Features
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 {{< callout type="info" >}} **Protocol Revision**: 2025-03-26 {{< /callout >}}