modelcontextprotocol · chemicL · Mar 13, 2026
diff --git a/conformance-tests/VALIDATION_RESULTS.md b/conformance-tests/VALIDATION_RESULTS.md
@@ -3,7 +3,7 @@
 ## Summary
 
 **Server Tests:** 40/40 passed (100%)
-**Client Tests:** 3/4 scenarios passed (9/10 checks passed)
+**Client Tests:** 4/4 scenarios passed (8/8 checks passed, 2 warnings)
 **Auth Tests:** 12/14 scenarios fully passing (178 passed, 1 failed, 1 warning, 85.7% scenarios, 98.9% checks)
 
 ## Server Test Results
@@ -20,20 +20,17 @@
 
 ## Client Test Results
 
-### Passing (3/4 scenarios, 9/10 checks)
+### Passing (4/4 scenarios, 8/8 checks)
 
 - **initialize (1/1):** Protocol negotiation, clientInfo, capabilities
 - **tools_call (1/1):** Tool discovery and invocation
 - **elicitation-sep1034-client-defaults (5/5):** Default values for string, integer, number, enum, boolean
-
-### Partially Passing (1/4 scenarios, 1/2 checks)
-
-- **sse-retry (1/2 + 1 warning):**
+- **sse-retry (1/1 + 2 warnings):**
   - ✅ Reconnects after stream closure
-  - ❌ Does not respect retry timing
+  - ⚠️ Does not respect retry timing (MUST requirement)
   - ⚠️ Does not send Last-Event-ID header (SHOULD requirement)
 
-**Issue:** Client treats `retry:` SSE field as invalid instead of parsing it for reconnection timing.
+**Note:** Client treats `retry:` SSE field as invalid instead of parsing it for reconnection timing.
 
 ## Auth Test Results (Spring HTTP Client)
 
@@ -87,7 +84,7 @@ cd conformance-tests/client-jdk-http-client
 # Run all scenarios
 for scenario in initialize tools_call elicitation-sep1034-client-defaults sse-retry; do
   npx @modelcontextprotocol/conformance client \
-    --command "java -jar target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+    --command "java -jar target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
     --scenario $scenario
 done
 ```
@@ -104,7 +101,7 @@ cd conformance-tests/client-spring-http-client
 # Run auth suite
 npx @modelcontextprotocol/conformance@0.1.15 client \
   --spec-version 2025-11-25 \
-  --command "java -jar target/client-spring-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar target/client-spring-http-client-2.0.0-SNAPSHOT.jar" \
   --suite auth
 ```
 

diff --git a/conformance-tests/client-jdk-http-client/README.md b/conformance-tests/client-jdk-http-client/README.md
@@ -40,7 +40,7 @@ Currently implemented scenarios:
   - ⚠️ Lists available tools from the server
   - ⚠️ Calls the `test_reconnection` tool which triggers SSE stream closure
   - ✅ Client reconnects after stream closure (PASSING)
-  - ❌ Client does not respect retry timing (FAILING)
+  - ⚠️ Client does not respect retry timing (WARNING - MUST requirement)
   - ⚠️ Client does not send Last-Event-ID header (WARNING - SHOULD requirement)
 
 ## Building
@@ -54,7 +54,7 @@ cd conformance-tests/client-jdk-http-client
 
 This creates an executable JAR at:
 ```
-target/client-jdk-http-client-1.1.0-SNAPSHOT.jar
+target/client-jdk-http-client-2.0.0-SNAPSHOT.jar
 ```
 
 ## Running Tests
@@ -65,27 +65,27 @@ Run a single scenario:
 
 ```bash
 npx @modelcontextprotocol/conformance client \
-  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario initialize
 
 npx @modelcontextprotocol/conformance client \
-  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario tools_call
 
 npx @modelcontextprotocol/conformance client \
-  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario elicitation-sep1034-client-defaults
 
 npx @modelcontextprotocol/conformance client \
-  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario sse-retry
 ```
 
 Run with verbose output:
 
 ```bash
 npx @modelcontextprotocol/conformance client \
-  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario initialize \
   --verbose
 ```
@@ -96,18 +96,18 @@ You can also run the client manually if you have a test server:
 
 ```bash
 export MCP_CONFORMANCE_SCENARIO=initialize
-java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-1.1.0-SNAPSHOT.jar http://localhost:3000/mcp
+java -jar conformance-tests/client-jdk-http-client/target/client-jdk-http-client-2.0.0-SNAPSHOT.jar http://localhost:3000/mcp
 ```
 
 ## Test Results
 
 The conformance framework generates test results showing:
 
-**Current Status (3/4 scenarios passing):**
+**Current Status (4/4 scenarios passing):**
 - ✅ initialize: 1/1 checks passed
 - ✅ tools_call: 1/1 checks passed
 - ✅ elicitation-sep1034-client-defaults: 5/5 checks passed
-- ⚠️ sse-retry: 1/2 checks passed, 1 warning
+- ⚠️ sse-retry: 1/1 checks passed, 2 warnings
 
 Test result files are generated in `results/<scenario>-<timestamp>/`:
 - `checks.json`: Array of conformance check results with pass/fail status
@@ -116,7 +116,7 @@ Test result files are generated in `results/<scenario>-<timestamp>/`:
 
 ### Known Issue: SSE Retry Handling
 
-The `sse-retry` scenario currently fails because:
+The `sse-retry` scenario passes but has 2 warnings:
 1. The client treats the SSE `retry:` field as invalid instead of parsing it
 2. The client does not implement retry timing (reconnects immediately)
 3. The client does not send the Last-Event-ID header on reconnection

diff --git a/...c/main/java/io/modelcontextprotocol/conformance/client/ConformanceJdkClientMcpClient.java b/...c/main/java/io/modelcontextprotocol/conformance/client/ConformanceJdkClientMcpClient.java
@@ -80,7 +80,7 @@ private static McpSyncClient createClient(String serverUrl) {
 		HttpClientStreamableHttpTransport transport = HttpClientStreamableHttpTransport.builder(serverUrl).build();
 
 		return McpClient.sync(transport)
-			.clientInfo(new McpSchema.Implementation("test-client", "1.0.0"))
+			.clientInfo(new McpSchema.Implementation("test-client", "2.0.0"))
 			.requestTimeout(Duration.ofSeconds(30))
 			.build();
 	}
@@ -97,7 +97,7 @@ private static McpSyncClient createClientWithElicitation(String serverUrl) {
 		var capabilities = McpSchema.ClientCapabilities.builder().elicitation().build();
 
 		return McpClient.sync(transport)
-			.clientInfo(new McpSchema.Implementation("test-client", "1.0.0"))
+			.clientInfo(new McpSchema.Implementation("test-client", "2.0.0"))
 			.requestTimeout(Duration.ofSeconds(30))
 			.capabilities(capabilities)
 			.elicitation(request -> {

diff --git a/conformance-tests/client-spring-http-client/README.md b/conformance-tests/client-spring-http-client/README.md
@@ -67,7 +67,7 @@ cd conformance-tests/client-spring-http-client
 
 This creates an executable JAR at:
 ```
-target/client-spring-http-client-1.1.0-SNAPSHOT.jar
+target/client-spring-http-client-2.0.0-SNAPSHOT.jar
 ```
 
 ## Running Tests
@@ -79,7 +79,7 @@ Run the full auth suite:
 ```bash
 npx @modelcontextprotocol/conformance@0.1.15 client \
   --spec-version 2025-11-25 \
-  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-2.0.0-SNAPSHOT.jar" \
   --suite auth
 ```
 
@@ -88,7 +88,7 @@ Run a single scenario:
 ```bash
 npx @modelcontextprotocol/conformance@0.1.15 client \
   --spec-version 2025-11-25 \
-  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario auth/metadata-default
 ```
 
@@ -97,7 +97,7 @@ Run with verbose output:
 ```bash
 npx @modelcontextprotocol/conformance@0.1.15 client \
   --spec-version 2025-11-25 \
-  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-1.1.0-SNAPSHOT.jar" \
+  --command "java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-2.0.0-SNAPSHOT.jar" \
   --scenario auth/metadata-default \
   --verbose
 ```
@@ -108,7 +108,7 @@ You can also run the client manually if you have a test server:
 
 ```bash
 export MCP_CONFORMANCE_SCENARIO=auth/metadata-default
-java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-1.1.0-SNAPSHOT.jar http://localhost:3000/mcp
+java -jar conformance-tests/client-spring-http-client/target/client-spring-http-client-2.0.0-SNAPSHOT.jar http://localhost:3000/mcp
 ```
 
 ## Known Issues

diff --git a/...nt/src/main/java/io/modelcontextprotocol/conformance/client/scenario/DefaultScenario.java b/...nt/src/main/java/io/modelcontextprotocol/conformance/client/scenario/DefaultScenario.java
@@ -58,7 +58,7 @@ public void execute(String serverUrl) {
 
 		this.client = McpClient.sync(transport)
 			.transportContextProvider(new AuthenticationMcpTransportContextProvider())
-			.clientInfo(new McpSchema.Implementation("test-client", "1.0.0"))
+			.clientInfo(new McpSchema.Implementation("test-client", "2.0.0"))
 			.requestTimeout(Duration.ofSeconds(30))
 			.build();
 

diff --git a/...ain/java/io/modelcontextprotocol/conformance/client/scenario/PreRegistrationScenario.java b/...ain/java/io/modelcontextprotocol/conformance/client/scenario/PreRegistrationScenario.java
@@ -60,7 +60,7 @@ public void execute(String serverUrl) {
 
 		var client = McpClient.sync(transport)
 			.transportContextProvider(new AuthenticationMcpTransportContextProvider())
-			.clientInfo(new McpSchema.Implementation("test-client", "1.0.0"))
+			.clientInfo(new McpSchema.Implementation("test-client", "2.0.0"))
 			.requestTimeout(Duration.ofSeconds(30))
 			.build();
 

diff --git a/conformance-tests/server-servlet/README.md b/conformance-tests/server-servlet/README.md
@@ -142,7 +142,7 @@ curl -X POST http://localhost:8080/mcp \
   -H "Content-Type: application/json" \
   -H "Accept: text/event-stream" \
   -H "mcp-session-id: test-session-123" \
-  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test-client","version":"1.0.0"}}}'
+  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test-client","version":"2.0.0"}}}'
 ```
 
 ## Architecture

diff --git a/...-servlet/src/main/java/io/modelcontextprotocol/conformance/server/ConformanceServlet.java b/...-servlet/src/main/java/io/modelcontextprotocol/conformance/server/ConformanceServlet.java
@@ -75,7 +75,7 @@ public static void main(String[] args) throws Exception {
 
 		// Build server with all conformance test features
 		var mcpServer = McpServer.sync(transportProvider)
-			.serverInfo("mcp-conformance-server", "1.0.0")
+			.serverInfo("mcp-conformance-server", "2.0.0")
 			.capabilities(ServerCapabilities.builder()
 				.completions()
 				.resources(true, false)

diff --git a/docs/quickstart.md b/docs/quickstart.md
@@ -123,7 +123,7 @@ Add the BOM to your project:
             <dependency>
                 <groupId>io.modelcontextprotocol.sdk</groupId>
                 <artifactId>mcp-bom</artifactId>
-                <version>1.0.0</version>
+                <version>2.0.0</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -135,7 +135,7 @@ Add the BOM to your project:
 
     ```groovy
     dependencies {
-        implementation platform("io.modelcontextprotocol.sdk:mcp-bom:1.0.0")
+        implementation platform("io.modelcontextprotocol.sdk:mcp-bom:2.0.0")
         //...
     }
     ```

diff --git a/docs/server.md b/docs/server.md
@@ -31,7 +31,7 @@ The server supports both synchronous and asynchronous APIs, allowing for flexibl
     ```java
     // Create a server with custom configuration
     McpSyncServer syncServer = McpServer.sync(transportProvider)
-        .serverInfo("my-server", "1.0.0")
+        .serverInfo("my-server", "2.0.0")
         .capabilities(ServerCapabilities.builder()
             .resources(false, true)  // Resource support: subscribe=false, listChanged=true
             .tools(true)             // Enable tool support with list changes
@@ -55,7 +55,7 @@ The server supports both synchronous and asynchronous APIs, allowing for flexibl
     ```java
     // Create an async server with custom configuration
     McpAsyncServer asyncServer = McpServer.async(transportProvider)
-        .serverInfo("my-server", "1.0.0")
+        .serverInfo("my-server", "2.0.0")
         .capabilities(ServerCapabilities.builder()
             .resources(false, true)  // Resource support: subscribe=false, listChanged=true
             .tools(true)             // Enable tool support with list changes
@@ -446,7 +446,7 @@ Enable subscription support in the server capabilities:
 
 ```java
 McpSyncServer server = McpServer.sync(transportProvider)
-    .serverInfo("my-server", "1.0.0")
+    .serverInfo("my-server", "2.0.0")
     .capabilities(ServerCapabilities.builder()
         .resources(true, false)  // subscribe=true, listChanged=false
         .build())
@@ -587,7 +587,7 @@ Once connected to a compatible client, the server can request language model gen
     ```java
     // Create a server
     McpSyncServer server = McpServer.sync(transportProvider)
-        .serverInfo("my-server", "1.0.0")
+        .serverInfo("my-server", "2.0.0")
         .build();
 
     // Define a tool that uses sampling
@@ -641,7 +641,7 @@ Once connected to a compatible client, the server can request language model gen
     ```java
     // Create a server
     McpAsyncServer server = McpServer.async(transportProvider)
-        .serverInfo("my-server", "1.0.0")
+        .serverInfo("my-server", "2.0.0")
         .build();
 
     // Define a tool that uses sampling
@@ -766,7 +766,7 @@ var tool = new McpServerFeatures.AsyncToolSpecification(
     });
 
 var mcpServer = McpServer.async(mcpServerTransportProvider)
-  .serverInfo("test-server", "1.0.0")
+  .serverInfo("test-server", "2.0.0")
   .capabilities(
     ServerCapabilities.builder()
       .logging() // Enable logging support