feat(amazonq): support listAvailableModels request (#5903)

Author: ctlai95

plugins/amazonq/chat/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/webview/BrowserConnector.kt

@@ -74,6 +74,7 @@ import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.Encry
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.EncryptedQuickActionChatParams
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.GET_SERIALIZED_CHAT_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.GetSerializedChatResponse
+import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_AVAILABLE_MODELS
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_MCP_SERVERS_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_RULES_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.MCP_SERVER_CLICK_REQUEST_METHOD
@@ -532,6 +533,17 @@ class BrowserConnector(
             CHAT_PINNED_CONTEXT_REMOVE -> {
                 handleChat(AmazonQChatServer.pinnedContextRemove, node)
             }
+            LIST_AVAILABLE_MODELS -> {
+                handleChat(AmazonQChatServer.listAvailableModels, node)
+                    .whenComplete { response, _ ->
+                        browser.postChat(
+                            FlareUiMessage(
+                                command = LIST_AVAILABLE_MODELS,
+                                params = response
+                            )
+                        )
+                    }
+            }
         }
     }
 

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/AmazonQChatServer.kt

@@ -40,9 +40,12 @@ import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.GetSe
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.GetSerializedChatResult
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.InfoLinkClickParams
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.InsertToCursorPositionParams
+import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_AVAILABLE_MODELS
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_MCP_SERVERS_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LIST_RULES_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.LinkClickParams
+import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ListAvailableModelsParams
+import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ListAvailableModelsResult
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ListConversationsParams
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.MCP_SERVER_CLICK_REQUEST_METHOD
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.OPEN_FILE_DIALOG_REQUEST_METHOD
@@ -255,4 +258,10 @@ object AmazonQChatServer : JsonRpcMethodProvider {
         Any::class.java,
         LSPAny::class.java
     )
+
+    val listAvailableModels = JsonRpcRequest(
+        LIST_AVAILABLE_MODELS,
+        ListAvailableModelsParams::class.java,
+        ListAvailableModelsResult::class.java
+    )
 }

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/model/aws/chat/FlareChatCommands.kt

@@ -64,3 +64,5 @@ const val MCP_SERVER_CLICK_REQUEST_METHOD = "aws/chat/mcpServerClick"
 const val OPEN_FILE_DIALOG_REQUEST_METHOD = "aws/chat/openFileDialog"
 const val LIST_RULES_REQUEST_METHOD = "aws/chat/listRules"
 const val RULE_CLICK_REQUEST_METHOD = "aws/chat/ruleClick"
+
+const val LIST_AVAILABLE_MODELS = "aws/chat/listAvailableModels"

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/model/aws/chat/ListAvailableModels.kt

@@ -0,0 +1,19 @@
+// Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat
+
+data class Model(
+    val id: String,
+    val name: String,
+)
+
+data class ListAvailableModelsParams(
+    val tabId: String,
+)
+
+data class ListAvailableModelsResult(
+    val tabId: String,
+    val models: List<Model>,
+    val selectedModelId: String? = null,
+)