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mcp: update latestProtocolVersion to 2025-11-25 (#724)

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Update the SDK to use protocol version 2025-11-25 as the latest
supported version. Fix tests and examples that had hardcoded
expectations for the previous version (2025-06-18).

---------

Co-authored-by: Maciej Kisiel <mkisiel@google.com>
This commit is contained in:
Robert Findley 2026-03-03 04:30:11 -05:00 • committed by GitHub
commit 4e1c3a34b5
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GPG key ID: B5690EEEBB952194
9 changed files with 12 additions and 18 deletions
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2
docs/protocol.md
View file

@ -165,7 +165,7 @@ func ExampleStreamableHTTPHandler() {
resp := mustPostMessage(`{"jsonrpc": "2.0", "id": 1, "method":"initialize", "params": {}}`, httpServer.URL)
fmt.Println(resp)
// Output:
// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.1.0"}}}
// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.1.0"}}}
}
```

4
docs/troubleshooting.md
View file

@ -50,8 +50,8 @@ func ExampleLoggingTransport() {
}
// Output:
// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.0.1"}}}
// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-06-18","capabilities":{"roots":{"listChanged":true}}}}
// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.0.1"}}}
// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-11-25","capabilities":{"roots":{"listChanged":true}}}}
// write: {"jsonrpc":"2.0","method":"notifications/initialized","params":{}}
}
```

6
mcp/protocol.go
View file

@ -4,12 +4,6 @@
package mcp
// Protocol types for version 2025-06-18.
// To see the schema changes from the previous version, run:
//
// prefix=https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/refs/heads/main/schema
// sdiff -l <(curl $prefix/2025-03-26/schema.ts) <(curl $prefix/2025/06-18/schema.ts)
import (
"encoding/json"
"fmt"

4
mcp/server_test.go
View file

@ -763,13 +763,13 @@ func TestClientRootCapabilities(t *testing.T) {
var initParams json.RawMessage
if tc.capabilities != nil {
initParams = json.RawMessage(`{
"protocolVersion": "2025-06-18",
"protocolVersion": "2025-11-25",
"capabilities": ` + *tc.capabilities + `,
"clientInfo": {"name": "TestClient", "version": "1.0.0"}
}`)
} else {
initParams = json.RawMessage(`{
"protocolVersion": "2025-06-18",
"protocolVersion": "2025-11-25",
"clientInfo": {"name": "TestClient", "version": "1.0.0"}
}`)
}

4
mcp/shared.go
View file

@ -34,8 +34,8 @@ const (
//
// It is the version that the client sends in the initialization request, and
// the default version used by the server.
latestProtocolVersion = protocolVersion20250618
protocolVersion20251125 = "2025-11-25" // not yet released
latestProtocolVersion = protocolVersion20251125
protocolVersion20251125 = "2025-11-25"
protocolVersion20250618 = "2025-06-18"
protocolVersion20250326 = "2025-03-26"
protocolVersion20241105 = "2024-11-05"

2
mcp/streamable_example_test.go
View file

@ -35,7 +35,7 @@ func ExampleStreamableHTTPHandler() {
resp := mustPostMessage(`{"jsonrpc": "2.0", "id": 1, "method":"initialize", "params": {}}`, httpServer.URL)
fmt.Println(resp)
// Output:
// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.1.0"}}}
// {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.1.0"}}}
}
// !-streamablehandler

2
mcp/streamable_test.go
View file

@ -758,7 +758,7 @@ func TestStreamableServerTransport(t *testing.T) {
Logging: &LoggingCapabilities{},
Tools: &ToolCapabilities{ListChanged: true},
},
ProtocolVersion: latestProtocolVersion,
ProtocolVersion: protocolVersion20250618,
ServerInfo: &Implementation{Name: "testServer", Version: "v1.0.0"},
}, nil)
initializedMsg := req(0, notificationInitialized, &InitializedParams{})

2
mcp/testdata/conformance/server/version-latest.txtar vendored
View file

@ -20,7 +20,7 @@ response with its latest supported version.
"capabilities": {
"logging": {}
},
"protocolVersion": "2025-06-18",
"protocolVersion": "2025-11-25",
"serverInfo": {
"name": "testServer",
"version": "v1.0.0"

4
mcp/transport_example_test.go
View file

@ -45,8 +45,8 @@ func ExampleLoggingTransport() {
}
// Output:
// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-06-18","serverInfo":{"name":"server","version":"v0.0.1"}}}
// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-06-18","capabilities":{"roots":{"listChanged":true}}}}
// read: {"jsonrpc":"2.0","id":1,"result":{"capabilities":{"logging":{}},"protocolVersion":"2025-11-25","serverInfo":{"name":"server","version":"v0.0.1"}}}
// write: {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"clientInfo":{"name":"client","version":"v0.0.1"},"protocolVersion":"2025-11-25","capabilities":{"roots":{"listChanged":true}}}}
// write: {"jsonrpc":"2.0","method":"notifications/initialized","params":{}}
}