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Track 2026-07-28 release #2805

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692281b
Start 2026-07-28 release tracking
dsp-ant May 27, 2026
19d06d5
docs(extensions): Use SEP-2575 capability exchanges consistently (#2830)
LucaButBoring Jun 2, 2026
a55f738
Merge branch 'main' into docs/2026-07-28-release
localden Jun 3, 2026
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23 changes: 16 additions & 7 deletions docs/extensions/auth/enterprise-managed-authorization.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -89,15 +89,24 @@ Key aspects of the flow:

To support Enterprise-Managed Authorization, your client must:

1. **Declare support** in the `initialize` request:
1. **Declare support** in its per-request capabilities:

```json
```jsonc
{
"capabilities": {
"extensions": {
"io.modelcontextprotocol/enterprise-managed-authorization": {}
}
}
"jsonrpc": "2.0",
"id": 1,
"method": "...",
"params": {
// Other fields...
"_meta": {
// Other fields...
"io.modelcontextprotocol/clientCapabilities": {
"extensions": {
"io.modelcontextprotocol/enterprise-managed-authorization": {},
},
},
},
},
}
```

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42 changes: 28 additions & 14 deletions docs/extensions/auth/oauth-client-credentials.mdx
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Expand Up @@ -92,15 +92,24 @@ To use the OAuth Client Credentials extension, your client must:
<Steps>
<Step title="Declare support">

Include the extension in the `initialize` request capabilities:
Include the extension in its per-request capabilities:

```json
```jsonc
{
"capabilities": {
"extensions": {
"io.modelcontextprotocol/oauth-client-credentials": {}
}
}
"jsonrpc": "2.0",
"id": 1,
"method": "...",
"params": {
// Other fields...
"_meta": {
// Other fields...
"io.modelcontextprotocol/clientCapabilities": {
"extensions": {
"io.modelcontextprotocol/oauth-client-credentials": {},
},
},
},
},
}
```

Expand Down Expand Up @@ -143,15 +152,20 @@ Ensure the token includes the required scopes for the requested operation.
</Step>
<Step title="Advertise support">

Optionally (but recommended for discoverability), include the extension in the `initialize` response:
Optionally (but recommended for discoverability), include the extension in the `server/discover` response:

```json
```jsonc
{
"capabilities": {
"extensions": {
"io.modelcontextprotocol/oauth-client-credentials": {}
}
}
"jsonrpc": "2.0",
"id": 1,
"result": {
// Other fields...
"capabilities": {
"extensions": {
"io.modelcontextprotocol/oauth-client-credentials": {},
},
},
},
}
```

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37 changes: 20 additions & 17 deletions docs/extensions/overview.mdx
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Expand Up @@ -113,47 +113,50 @@ A **breaking change** is any modification that would cause existing implementati

## Negotiation

Clients and servers advertise their support for extensions in the `extensions` field within their respective capabilities during the [initialization handshake](/specification/latest/basic/lifecycle).
Clients and servers advertise their support for extensions in the `extensions` field within their respective capability declarations.

### Client Capabilities

Clients advertise extension support in the `initialize` request:
Clients advertise extension support in `_meta["io.modelcontextprotocol/clientCapabilities"]` within each request:

```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "initialize",
"method": "tools/call",
"params": {
"protocolVersion": "2025-06-18",
"capabilities": {
"roots": {
"listChanged": true
},
"extensions": {
"io.modelcontextprotocol/ui": {
"mimeTypes": ["text/html;profile=mcp-app"]
"name": "get_weather",
"arguments": {
"location": "New York"
},
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2025-06-18",
"io.modelcontextprotocol/clientCapabilities": {
"extensions": {
"io.modelcontextprotocol/ui": {
"mimeTypes": ["text/html;profile=mcp-app"]
}
}
},
"io.modelcontextprotocol/clientInfo": {
"name": "ExampleClient",
"version": "1.0.0"
}
},
"clientInfo": {
"name": "ExampleClient",
"version": "1.0.0"
}
}
}
```

### Server Capabilities

Servers advertise extension support in the `initialize` response:
Servers advertise extension support in the `server/discover` response:

```json
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"protocolVersion": "2025-06-18",
"supportedVersions": ["2025-06-18"],
"capabilities": {
"tools": {},
"extensions": {
Expand Down
36 changes: 23 additions & 13 deletions docs/extensions/tasks/overview.mdx
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Expand Up @@ -152,19 +152,24 @@ To consume task-augmented responses, your client must:
<Steps>
<Step title="Declare support">

Include the extension in per-request capabilities:
Include the extension in its per-request capabilities:

```json
```jsonc
{
"jsonrpc": "2.0",
"id": 1,
"method": "...",
"params": {
// Other fields...
"_meta": {
// Other fields...
"io.modelcontextprotocol/clientCapabilities": {
"extensions": {
"io.modelcontextprotocol/tasks": {}
}
}
}
}
"io.modelcontextprotocol/tasks": {},
},
},
},
},
}
```

Expand Down Expand Up @@ -204,13 +209,18 @@ To return tasks from your server:

Include the extension in your `server/discover` capabilities:

```json
```jsonc
{
"capabilities": {
"extensions": {
"io.modelcontextprotocol/tasks": {}
}
}
"jsonrpc": "2.0",
"id": 1,
"result": {
// Other fields...
"capabilities": {
"extensions": {
"io.modelcontextprotocol/tasks": {},
},
},
},
}
```

Expand Down
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