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Add 2026-07-28 protocol version to negotiation lists #1176

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2 changes: 1 addition & 1 deletion ...main/java/io/modelcontextprotocol/client/transport/HttpClientStreamableHttpTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -679,7 +679,7 @@ public static class Builder {
private Duration connectTimeout = Duration.ofSeconds(10);

private List<String> supportedProtocolVersions = List.of(ProtocolVersions.MCP_2025_03_26,
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);

private McpHttpClientTransportAuthorizationErrorHandler authorizationErrorHandler = McpHttpClientTransportAuthorizationErrorHandler.NOOP;

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2 changes: 1 addition & 1 deletion ...o/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java
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Expand Up @@ -981,7 +981,7 @@ public void close() {
@Override
public List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2025_03_26, ProtocolVersions.MCP_2025_06_18,
ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);
}

public static Builder builder() {
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2 changes: 1 addition & 1 deletion mcp-core/src/main/java/io/modelcontextprotocol/spec/McpServerTransportProviderBase.java
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Expand Up @@ -83,7 +83,7 @@ default void close() {
*/
default List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2024_11_05, ProtocolVersions.MCP_2025_03_26,
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);
}

}
2 changes: 1 addition & 1 deletion mcp-core/src/main/java/io/modelcontextprotocol/spec/McpStatelessServerTransport.java
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Expand Up @@ -30,7 +30,7 @@ default void close() {

default List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2025_03_26, ProtocolVersions.MCP_2025_06_18,
ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);
}

}
2 changes: 1 addition & 1 deletion mcp-core/src/main/java/io/modelcontextprotocol/spec/McpTransport.java
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Expand Up @@ -102,7 +102,7 @@ static boolean isPeerClosed(Throwable t) {

default List<String> protocolVersions() {
return List.of(ProtocolVersions.MCP_2024_11_05, ProtocolVersions.MCP_2025_03_26,
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);
}

}
6 changes: 6 additions & 0 deletions mcp-core/src/main/java/io/modelcontextprotocol/spec/ProtocolVersions.java
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Expand Up @@ -26,4 +26,10 @@ public interface ProtocolVersions {
*/
String MCP_2025_11_25 = "2025-11-25";

/**
* MCP protocol version for 2026-07-28.
* https://modelcontextprotocol.io/specification/2026-07-28
*/
String MCP_2026_07_28 = "2026-07-28";

}
12 changes: 6 additions & 6 deletions ...delcontextprotocol/common/HttpClientStreamableHttpVersionNegotiationIntegrationTests.java
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Expand Up @@ -106,22 +106,22 @@ void usesLatestVersion() {
.hasSize(3)
.map(McpTestRequestRecordingServletFilter.Call::headers)
.allSatisfy(headers -> assertThat(headers).containsEntry("mcp-protocol-version",
ProtocolVersions.MCP_2025_11_25));
ProtocolVersions.MCP_2026_07_28));

assertThat(response).isNotNull();
assertThat(response.content()).hasSize(1)
.first()
.extracting(McpSchema.TextContent.class::cast)
.extracting(McpSchema.TextContent::text)
.isEqualTo(ProtocolVersions.MCP_2025_11_25);
.isEqualTo(ProtocolVersions.MCP_2026_07_28);
}

}

@Test
void usesServerSupportedVersion() {
var transport = HttpClientStreamableHttpTransport.builder("http://localhost:" + PORT)
.supportedProtocolVersions(List.of(ProtocolVersions.MCP_2025_11_25, "2263-03-18"))
.supportedProtocolVersions(List.of(ProtocolVersions.MCP_2026_07_28, "2263-03-18"))
.build();
try (var client = McpClient.sync(transport).build()) {
client.initialize();
Expand All @@ -137,14 +137,14 @@ void usesServerSupportedVersion() {
.hasSize(2)
.map(McpTestRequestRecordingServletFilter.Call::headers)
.allSatisfy(headers -> assertThat(headers).containsEntry("mcp-protocol-version",
ProtocolVersions.MCP_2025_11_25));
ProtocolVersions.MCP_2026_07_28));

assertThat(response).isNotNull();
assertThat(response.content()).hasSize(1)
.first()
.extracting(McpSchema.TextContent.class::cast)
.extracting(McpSchema.TextContent::text)
.isEqualTo(ProtocolVersions.MCP_2025_11_25);
.isEqualTo(ProtocolVersions.MCP_2026_07_28);
}
}

Expand All @@ -155,7 +155,7 @@ void clientDoesNotSupportProtocolVersion20241105ByDefault() {
// Testing it on the wire would require building a custom transport
// We trust the protocolVersions() accessor instead
assertThat(transport.protocolVersions()).containsExactly(ProtocolVersions.MCP_2025_03_26,
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25, ProtocolVersions.MCP_2026_07_28);
}

@Test
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2 changes: 1 addition & 1 deletion mcp-test/src/test/java/io/modelcontextprotocol/server/McpServerProtocolVersionTests.java
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Expand Up @@ -41,7 +41,7 @@ void shouldUseLatestVersionByDefault() {

String requestId = UUID.randomUUID().toString();

transportProvider.simulateIncomingMessage(jsonRpcInitializeRequest(requestId, ProtocolVersions.MCP_2025_11_25));
transportProvider.simulateIncomingMessage(jsonRpcInitializeRequest(requestId, ProtocolVersions.MCP_2026_07_28));

McpSchema.JSONRPCMessage response = serverTransport.getLastSentMessage();
assertThat(response).isInstanceOf(McpSchema.JSONRPCResponse.class);
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