Handle Bedrock models that cannot use `system` prompts (#2489)

frontend/src/pages/WorkspaceSettings/AgentConfig/AgentModelSelection/index.jsx

@@ -5,21 +5,30 @@ import paths from "@/utils/paths";
 import { useTranslation } from "react-i18next";
 import { Link, useParams } from "react-router-dom";
 
-// These models do NOT support function calling
-// and therefore are not supported for agents.
+/**
+ * These models do NOT support function calling
+ * or do not support system prompts
+ * and therefore are not supported for agents.
+ * @param {string} provider - The AI provider.
+ * @param {string} model - The model name.
+ * @returns {boolean} Whether the model is supported for agents.
+ */
 function supportedModel(provider, model = "") {
-  if (provider !== "openai") return true;
-  return (
-    [
-      "gpt-3.5-turbo-0301",
-      "gpt-4-turbo-2024-04-09",
-      "gpt-4-turbo",
-      "o1-preview",
-      "o1-preview-2024-09-12",
-      "o1-mini",
-      "o1-mini-2024-09-12",
-    ].includes(model) === false
-  );
+  if (provider === "openai") {
+    return (
+      [
+        "gpt-3.5-turbo-0301",
+        "gpt-4-turbo-2024-04-09",
+        "gpt-4-turbo",
+        "o1-preview",
+        "o1-preview-2024-09-12",
+        "o1-mini",
+        "o1-mini-2024-09-12",
+      ].includes(model) === false
+    );
+  }
+
+  return true;
 }
 
 export default function AgentModelSelection({

server/utils/AiProviders/bedrock/index.js

@@ -7,6 +7,20 @@ const { NativeEmbedder } = require("../../EmbeddingEngines/native");
 
 // Docs: https://js.langchain.com/v0.2/docs/integrations/chat/bedrock_converse
 class AWSBedrockLLM {
+  /**
+   * These models do not support system prompts
+   * It is not explicitly stated but it is observed that they do not use the system prompt
+   * in their responses and will crash when a system prompt is provided.
+   * We can add more models to this list as we discover them or new models are added.
+   * We may want to extend this list or make a user-config if using custom bedrock models.
+   */
+  noSystemPromptModels = [
+    "amazon.titan-text-express-v1",
+    "amazon.titan-text-lite-v1",
+    "cohere.command-text-v14",
+    "cohere.command-light-text-v14",
+  ];
+
   constructor(embedder = null, modelPreference = null) {
     if (!process.env.AWS_BEDROCK_LLM_ACCESS_KEY_ID)
       throw new Error("No AWS Bedrock LLM profile id was set.");
@@ -59,6 +73,22 @@ class AWSBedrockLLM {
 
     for (const chat of chats) {
       if (!roleToMessageMap.hasOwnProperty(chat.role)) continue;
+
+      // When a model does not support system prompts, we need to handle it.
+      // We will add a new message that simulates the system prompt via a user message and AI response.
+      // This will allow the model to respond without crashing but we can still inject context.
+      if (
+        this.noSystemPromptModels.includes(this.model) &&
+        chat.role === "system"
+      ) {
+        this.#log(
+          `Model does not support system prompts! Simulating system prompt via Human/AI message pairs.`
+        );
+        langchainChats.push(new HumanMessage({ content: chat.content }));
+        langchainChats.push(new AIMessage({ content: "Okay." }));
+        continue;
+      }
+
       const MessageClass = roleToMessageMap[chat.role];
       langchainChats.push(new MessageClass({ content: chat.content }));
     }
@@ -78,6 +108,10 @@ class AWSBedrockLLM {
     );
   }
 
+  #log(text, ...args) {
+    console.log(`\x1b[32m[AWSBedrock]\x1b[0m ${text}`, ...args);
+  }
+
   streamingEnabled() {
     return "streamGetChatCompletion" in this;
   }