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Reject listRoots when roots capability is unsupported by zsewasdsdsd · Pull Request #1144 · modelcontextprotocol/java-sdk · GitHub

  1. modelcontextprotocol
  2. java-sdk

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Reject listRoots when roots capability is unsupported #1144

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Reject listRoots when roots capability is unsupported #1144

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7 changes: 7 additions & 0 deletions mcp-core/src/main/java/io/modelcontextprotocol/server/McpAsyncServerExchange.java
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Original file line number Diff line number Diff line change
Expand Up @@ -225,6 +225,13 @@ public Mono<McpSchema.ListRootsResult> listRoots() {
* @return A Mono that emits the list of roots result containing
*/
public Mono<McpSchema.ListRootsResult> listRoots(String cursor) {
if (this.clientCapabilities == null) {
return Mono
.error(new IllegalStateException("Client must be initialized. Call the initialize method first!"));
}
if (this.clientCapabilities.roots() == null) {
return Mono.error(new IllegalStateException("Roots not supported"));
}
return this.session.sendRequest(McpSchema.METHOD_ROOTS_LIST, new McpSchema.PaginatedRequest(cursor),
LIST_ROOTS_RESULT_TYPE_REF);
}
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28 changes: 28 additions & 0 deletions mcp-core/src/test/java/io/modelcontextprotocol/server/McpAsyncServerExchangeTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,34 @@ void setUp() {
McpTransportContext.EMPTY);
}

@Test
void testListRootsWithNullCapabilities() {
McpAsyncServerExchange exchangeWithNullCapabilities = new McpAsyncServerExchange("testSessionId", mockSession,
null, clientInfo, McpTransportContext.EMPTY);

StepVerifier.create(exchangeWithNullCapabilities.listRoots()).verifyErrorSatisfies(error -> {
assertThat(error).isInstanceOf(IllegalStateException.class)
.hasMessage("Client must be initialized. Call the initialize method first!");
});

verify(mockSession, never()).sendRequest(eq(McpSchema.METHOD_ROOTS_LIST), any(McpSchema.PaginatedRequest.class),
any(TypeRef.class));
}

@Test
void testListRootsWithoutRootsCapability() {
McpSchema.ClientCapabilities capabilitiesWithoutRoots = McpSchema.ClientCapabilities.builder().build();
McpAsyncServerExchange exchangeWithoutRoots = new McpAsyncServerExchange("testSessionId", mockSession,
capabilitiesWithoutRoots, clientInfo, McpTransportContext.EMPTY);

StepVerifier.create(exchangeWithoutRoots.listRoots("someCursor")).verifyErrorSatisfies(error -> {
assertThat(error).isInstanceOf(IllegalStateException.class).hasMessage("Roots not supported");
});

verify(mockSession, never()).sendRequest(eq(McpSchema.METHOD_ROOTS_LIST), any(McpSchema.PaginatedRequest.class),
any(TypeRef.class));
}

@Test
void testListRootsWithSinglePage() {

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