Fix(FlowiseChatGoogleGenerativeAI): Prevent "parts must not be empty" API error in Seq Agents (#4292)

* Fix(FlowiseChatGoogleGenerativeAI): Prevent "parts must not be empty" API error in Seq Agents

* Fix: Update pnpm-lock.yaml to resolve CI issues

* convert role function and tool to function

* remove comment

---------

Co-authored-by: Henry <hzj94@hotmail.com>

CONTRIBUTING.md

@@ -121,7 +121,7 @@ Flowise has 3 different modules in a single mono repository.
 Flowise support different environment variables to configure your instance. You can specify the following variables in the `.env` file inside `packages/server` folder. Read [more](https://docs.flowiseai.com/environment-variables)
 
 | Variable                           | Description                                                                      | Type                                             | Default                             |
-|------------------------------------|----------------------------------------------------------------------------------|--------------------------------------------------|-------------------------------------|
+| ---------------------------------- | -------------------------------------------------------------------------------- | ------------------------------------------------ | ----------------------------------- |
 | PORT                               | The HTTP port Flowise runs on                                                    | Number                                           | 3000                                |
 | CORS_ORIGINS                       | The allowed origins for all cross-origin HTTP calls                              | String                                           |                                     |
 | IFRAME_ORIGINS                     | The allowed origins for iframe src embedding                                     | String                                           |                                     |

package.json

@@ -83,7 +83,7 @@
         "pnpm": ">=9"
     },
     "resolutions": {
-        "@google/generative-ai": "^0.22.0",
+        "@google/generative-ai": "^0.24.0",
         "@grpc/grpc-js": "^1.10.10",
         "@langchain/core": "0.3.37",
         "@qdrant/openapi-typescript-fetch": "1.2.6",

packages/components/models.json

@@ -420,12 +420,16 @@
             "name": "chatGoogleGenerativeAI",
             "models": [
                 {
-                    "label": "gemini-2.0-flash-001",
+                    "label": "gemini-2.5-pro-preview-03-25",
-                    "name": "gemini-2.0-flash-001"
+                    "name": "gemini-2.5-pro-preview-03-25"
                 },
                 {
-                    "label": "gemini-2.0-flash-lite-001",
+                    "label": "gemini-2.0-flash",
-                    "name": "gemini-2.0-flash-lite-001"
+                    "name": "gemini-2.0-flash"
+                },
+                {
+                    "label": "gemini-2.0-flash-lite",
+                    "name": "gemini-2.0-flash-lite"
                 },
                 {
                     "label": "gemini-1.5-flash",
@@ -1336,6 +1340,10 @@
                 {
                     "label": "text-embedding-004",
                     "name": "text-embedding-004"
+                },
+                {
+                    "label": "gemini-embedding-exp-03-07",
+                    "name": "gemini-embedding-exp-03-07"
                 }
             ]
         },

packages/components/nodes/chatmodels/ChatGoogleGenerativeAI/FlowiseChatGoogleGenerativeAI.ts

@@ -415,24 +415,18 @@ function getMessageAuthor(message: BaseMessage) {
 }
 
 function convertAuthorToRole(author: string) {
-    switch (author) {
+    switch (author.toLowerCase()) {
-        /**
-         *  Note: Gemini currently is not supporting system messages
-         *  we will convert them to human messages and merge with following
-         * */
         case 'ai':
-        case 'model': // getMessageAuthor returns message.name. code ex.: return message.name ?? type;
+        case 'assistant':
+        case 'model':
             return 'model'
-        case 'system':
-        case 'human':
-            return 'user'
         case 'function':
         case 'tool':
             return 'function'
+        case 'system':
+        case 'human':
         default:
-            // Instead of throwing, we return model (Needed for Multi Agent)
+            return 'user'
-            // throw new Error(`Unknown / unsupported author: ${author}`)
-            return 'model'
     }
 }
 
@@ -520,17 +514,29 @@ function convertMessageContentToParts(message: BaseMessage, isMultimodalModel: b
 
 function checkIfEmptyContentAndSameRole(contents: Content[]) {
     let prevRole = ''
-    const removedContents: Content[] = []
+    const validContents: Content[] = []
+
     for (const content of contents) {
-        const role = content.role
+        // Skip only if completely empty
-        if (content.parts.length && content.parts[0].text === '' && role === prevRole) {
+        if (!content.parts || !content.parts.length) {
-            removedContents.push(content)
+            continue
         }
 
-        prevRole = role
+        // Ensure role is always either 'user' or 'model'
+        content.role = content.role === 'model' ? 'model' : 'user'
+
+        // Handle consecutive messages
+        if (content.role === prevRole && validContents.length > 0) {
+            // Merge with previous content if same role
+            validContents[validContents.length - 1].parts.push(...content.parts)
+            continue
         }
 
-    return contents.filter((content) => !removedContents.includes(content))
+        validContents.push(content)
+        prevRole = content.role
+    }
+
+    return validContents
 }
 
 function convertBaseMessagesToContent(messages: BaseMessage[], isMultimodalModel: boolean) {
@@ -568,7 +574,7 @@ function convertBaseMessagesToContent(messages: BaseMessage[], isMultimodalModel
                 }
             }
             let actualRole = role
-            if (actualRole === 'function') {
+            if (actualRole === 'function' || actualRole === 'tool') {
                 // GenerativeAI API will throw an error if the role is not "user" or "model."
                 actualRole = 'user'
             }

packages/components/package.json

@@ -36,7 +36,7 @@
         "@gomomento/sdk-core": "^1.51.1",
         "@google-ai/generativelanguage": "^2.5.0",
         "@google-cloud/storage": "^7.15.2",
-        "@google/generative-ai": "^0.15.0",
+        "@google/generative-ai": "^0.24.0",
         "@huggingface/inference": "^2.6.1",
         "@langchain/anthropic": "0.3.14",
         "@langchain/aws": "0.1.4",
@@ -45,7 +45,7 @@
         "@langchain/community": "^0.3.24",
         "@langchain/core": "0.3.37",
         "@langchain/exa": "^0.0.5",
-        "@langchain/google-genai": "0.1.9",
+        "@langchain/google-genai": "0.2.3",
         "@langchain/google-vertexai": "^0.2.0",
         "@langchain/groq": "0.1.2",
         "@langchain/langgraph": "^0.0.22",