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Add MCP ping request support #1016

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Merged
franco2002lu merged 1 commit into from
Jan 14, 2026
Merged

Add MCP ping request support #1016

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9 changes: 9 additions & 0 deletions mcp/mcp-server/src/main/java/software/amazon/smithy/java/mcp/server/McpService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,7 @@ public JsonRpcResponse handleRequest(
var method = req.getMethod();
return switch (method) {
case "initialize" -> handleInitialize(req);
case "ping" -> handlePing(req);
default -> {
initializeProxies(rpcResponse -> {});
yield switch (method) {
Expand Down Expand Up @@ -218,6 +219,14 @@ private JsonRpcResponse handleInitialize(JsonRpcRequest req) {
return createSuccessResponse(req.getId(), result);
}

private JsonRpcResponse handlePing(JsonRpcRequest req) {
return JsonRpcResponse.builder()
.id(req.getId())
.result(Document.of(Map.of()))
.jsonrpc("2.0")
.build();
}

private JsonRpcResponse handlePromptsList(JsonRpcRequest req) {
var result = ListPromptsResult.builder()
.prompts(prompts.values().stream().map(Prompt::promptInfo).toList())
Expand Down
30 changes: 30 additions & 0 deletions mcp/mcp-server/src/test/java/software/amazon/smithy/java/mcp/server/McpServerTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,36 @@ private void initializeWithProtocolVersion(ProtocolVersion protocolVersion) {
assertEquals(expectedPv, pv);
}

@Test
public void testPing() {
server = McpServer.builder()
.name("smithy-mcp-server")
.input(input)
.output(output)
.addService("test-mcp",
ProxyService.builder()
.service(ShapeId.from("smithy.test#TestService"))
.proxyEndpoint("http://localhost")
.model(MODEL)
.build())
.build();

server.start();

write("ping", Document.of(Map.of()), Document.of(42));
var response = read();
assertEquals(42, response.getId().asNumber().intValue());
assertNotNull(response.getResult());
assertTrue(response.getResult().asStringMap().isEmpty());
assertEquals("2.0", response.getJsonrpc());

write("ping", Document.of(Map.of()), Document.of("ping-id"));
response = read();
assertEquals("ping-id", response.getId().asString());
assertNotNull(response.getResult());
assertTrue(response.getResult().asStringMap().isEmpty());
}

@Test
public void noOutputSchemaWithUnsupportedProtocolVersion() {
server = McpServer.builder()
Expand Down