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| 1 | +/* |
| 2 | + * Copyright 2026-2026 the original author or authors. |
| 3 | + */ |
| 4 | + |
| 5 | +package io.modelcontextprotocol.server; |
| 6 | + |
| 7 | +import io.modelcontextprotocol.MockMcpServerTransport; |
| 8 | +import io.modelcontextprotocol.MockMcpServerTransportProvider; |
| 9 | +import io.modelcontextprotocol.spec.McpSchema; |
| 10 | +import org.junit.jupiter.api.Test; |
| 11 | +import reactor.core.publisher.Mono; |
| 12 | +import reactor.test.StepVerifier; |
| 13 | + |
| 14 | +import static org.assertj.core.api.Assertions.assertThat; |
| 15 | +import static org.assertj.core.api.Assertions.assertThatCode; |
| 16 | + |
| 17 | +/** |
| 18 | + * Runtime add/remove operations on a server whose capabilities were derived from the |
| 19 | + * features registered at build time (no explicit {@code capabilities(...)}). The derived |
| 20 | + * capabilities leave {@code listChanged} unset, so no list_changed notification is |
| 21 | + * expected and the operations must complete normally. |
| 22 | + */ |
| 23 | +class DerivedCapabilitiesRuntimeChangesTests { |
| 24 | + |
| 25 | + private static final McpSchema.Implementation SERVER_INFO = McpSchema.Implementation.builder("test-server", "1.0.0") |
| 26 | + .build(); |
| 27 | + |
| 28 | + private static McpServerFeatures.AsyncToolSpecification asyncTool(String name) { |
| 29 | + return McpServerFeatures.AsyncToolSpecification.builder() |
| 30 | + .tool(McpSchema.Tool.builder(name).description(name).build()) |
| 31 | + .callHandler((exchange, request) -> Mono.just(McpSchema.CallToolResult.builder().build())) |
| 32 | + .build(); |
| 33 | + } |
| 34 | + |
| 35 | + private static McpServerFeatures.AsyncResourceSpecification asyncResource(String uri) { |
| 36 | + return new McpServerFeatures.AsyncResourceSpecification(McpSchema.Resource.builder(uri, uri).build(), |
| 37 | + (exchange, request) -> Mono.empty()); |
| 38 | + } |
| 39 | + |
| 40 | + private static McpServerFeatures.AsyncResourceTemplateSpecification asyncTemplate(String uriTemplate) { |
| 41 | + return new McpServerFeatures.AsyncResourceTemplateSpecification( |
| 42 | + McpSchema.ResourceTemplate.builder(uriTemplate, uriTemplate).build(), |
| 43 | + (exchange, request) -> Mono.empty()); |
| 44 | + } |
| 45 | + |
| 46 | + private static McpServerFeatures.AsyncPromptSpecification asyncPrompt(String name) { |
| 47 | + return new McpServerFeatures.AsyncPromptSpecification(McpSchema.Prompt.builder(name).build(), |
| 48 | + (exchange, request) -> Mono.empty()); |
| 49 | + } |
| 50 | + |
| 51 | + @Test |
| 52 | + void addAndRemoveToolWithDerivedCapabilities() { |
| 53 | + MockMcpServerTransport transport = new MockMcpServerTransport(); |
| 54 | + McpAsyncServer server = McpServer.async(new MockMcpServerTransportProvider(transport)) |
| 55 | + .serverInfo(SERVER_INFO) |
| 56 | + .tools(asyncTool("initial")) |
| 57 | + .build(); |
| 58 | + |
| 59 | + assertThat(server.getServerCapabilities().tools().listChanged()).isNull(); |
| 60 | + |
| 61 | + StepVerifier.create(server.addTool(asyncTool("added"))).verifyComplete(); |
| 62 | + StepVerifier.create(server.removeTool("initial")).verifyComplete(); |
| 63 | + |
| 64 | + assertThat(server.listTools().map(McpSchema.Tool::name).collectList().block()).containsExactly("added"); |
| 65 | + assertThat(transport.getAllSentMessages()).isEmpty(); |
| 66 | + } |
| 67 | + |
| 68 | + @Test |
| 69 | + void addAndRemoveResourceAndTemplateWithDerivedCapabilities() { |
| 70 | + MockMcpServerTransport transport = new MockMcpServerTransport(); |
| 71 | + McpAsyncServer server = McpServer.async(new MockMcpServerTransportProvider(transport)) |
| 72 | + .serverInfo(SERVER_INFO) |
| 73 | + .resources(asyncResource("test://initial")) |
| 74 | + .build(); |
| 75 | + |
| 76 | + assertThat(server.getServerCapabilities().resources().listChanged()).isNull(); |
| 77 | + |
| 78 | + StepVerifier.create(server.addResource(asyncResource("test://added"))).verifyComplete(); |
| 79 | + StepVerifier.create(server.removeResource("test://initial")).verifyComplete(); |
| 80 | + StepVerifier.create(server.addResourceTemplate(asyncTemplate("test://items/{id}"))).verifyComplete(); |
| 81 | + |
| 82 | + assertThat(transport.getAllSentMessages()).isEmpty(); |
| 83 | + } |
| 84 | + |
| 85 | + @Test |
| 86 | + void addAndRemovePromptWithDerivedCapabilities() { |
| 87 | + MockMcpServerTransport transport = new MockMcpServerTransport(); |
| 88 | + McpAsyncServer server = McpServer.async(new MockMcpServerTransportProvider(transport)) |
| 89 | + .serverInfo(SERVER_INFO) |
| 90 | + .prompts(asyncPrompt("initial")) |
| 91 | + .build(); |
| 92 | + |
| 93 | + assertThat(server.getServerCapabilities().prompts().listChanged()).isNull(); |
| 94 | + |
| 95 | + StepVerifier.create(server.addPrompt(asyncPrompt("added"))).verifyComplete(); |
| 96 | + StepVerifier.create(server.removePrompt("initial")).verifyComplete(); |
| 97 | + |
| 98 | + assertThat(transport.getAllSentMessages()).isEmpty(); |
| 99 | + } |
| 100 | + |
| 101 | + @Test |
| 102 | + void syncServerAddAndRemoveToolWithDerivedCapabilities() { |
| 103 | + McpSyncServer server = McpServer.sync(new MockMcpServerTransportProvider(new MockMcpServerTransport())) |
| 104 | + .serverInfo(SERVER_INFO) |
| 105 | + .tools(McpServerFeatures.SyncToolSpecification.builder() |
| 106 | + .tool(McpSchema.Tool.builder("initial").description("initial").build()) |
| 107 | + .callHandler((exchange, request) -> McpSchema.CallToolResult.builder().build()) |
| 108 | + .build()) |
| 109 | + .build(); |
| 110 | + |
| 111 | + assertThatCode(() -> server.addTool(McpServerFeatures.SyncToolSpecification.builder() |
| 112 | + .tool(McpSchema.Tool.builder("added").description("added").build()) |
| 113 | + .callHandler((exchange, request) -> McpSchema.CallToolResult.builder().build()) |
| 114 | + .build())).doesNotThrowAnyException(); |
| 115 | + assertThatCode(() -> server.removeTool("initial")).doesNotThrowAnyException(); |
| 116 | + } |
| 117 | + |
| 118 | +} |
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