Workspace agent autoselection (#2357)

* refactor agent to add fallback to workspace, then to chat provider/model

* commenting
update logic for bedrock and fireworks fallbacks

---------

Co-authored-by: timothycarambat <rambat1010@gmail.com>

server/utils/agents/index.js

@@ -16,6 +16,7 @@ class AgentHandler {
     lmstudio: "LMSTUDIO_MODEL_PREF",
     textgenwebui: null, // does not even use `model` in API req
     "generic-openai": "GENERIC_OPEN_AI_MODEL_PREF",
+    bedrock: "AWS_BEDROCK_LLM_MODEL_PREFERENCE",
   };
   invocation = null;
   aibitat = null;
@@ -149,20 +150,16 @@ class AgentHandler {
         if (
           !process.env.AWS_BEDROCK_LLM_ACCESS_KEY_ID ||
           !process.env.AWS_BEDROCK_LLM_ACCESS_KEY ||
-          !process.env.AWS_BEDROCK_LLM_REGION ||
-          !process.env.AWS_BEDROCK_LLM_MODEL_PREFERENCE
+          !process.env.AWS_BEDROCK_LLM_REGION
         )
           throw new Error(
-            "AWS Bedrock Access Keys, model and region must be provided to use agents."
+            "AWS Bedrock Access Keys and region must be provided to use agents."
           );
         break;
       case "fireworksai":
-        if (
-          !process.env.FIREWORKS_AI_LLM_API_KEY ||
-          !process.env.FIREWORKS_AI_LLM_MODEL_PREF
-        )
+        if (!process.env.FIREWORKS_AI_LLM_API_KEY)
           throw new Error(
-            "FireworksAI API Key & model must be provided to use agents."
+            "FireworksAI API Key must be provided to use agents."
           );
         break;
 
@@ -173,8 +170,8 @@ class AgentHandler {
     }
   }
 
-  providerDefault() {
-    switch (this.provider) {
+  providerDefault(provider = this.provider) {
+    switch (provider) {
       case "openai":
         return "gpt-4o";
       case "anthropic":
@@ -214,6 +211,32 @@ class AgentHandler {
     }
   }
 
+  #getFallbackProvider() {
+    // First, fallback to the workspace chat provider and model if they exist
+    if (
+      this.invocation.workspace.chatProvider &&
+      this.invocation.workspace.chatModel
+    ) {
+      return {
+        provider: this.invocation.workspace.chatProvider,
+        model: this.invocation.workspace.chatModel,
+      };
+    }
+
+    // If workspace does not have chat provider and model fallback
+    // to system provider and try to load provider default model
+    const systemProvider = process.env.LLM_PROVIDER;
+    const systemModel = this.providerDefault(systemProvider);
+    if (systemProvider && systemModel) {
+      return {
+        provider: systemProvider,
+        model: systemModel,
+      };
+    }
+
+    return null;
+  }
+
   /**
    * Finds or assumes the model preference value to use for API calls.
    * If multi-model loading is supported, we use their agent model selection of the workspace
@@ -222,22 +245,41 @@ class AgentHandler {
    * @returns {string} the model preference value to use in API calls
    */
   #fetchModel() {
-    if (!Object.keys(this.noProviderModelDefault).includes(this.provider))
-      return this.invocation.workspace.agentModel || this.providerDefault();
+    // Provider was not explicitly set for workspace, so we are going to run our fallback logic
+    // that will set a provider and model for us to use.
+    if (!this.provider) {
+      const fallback = this.#getFallbackProvider();
+      if (!fallback) throw new Error("No valid provider found for the agent.");
+      this.provider = fallback.provider; // re-set the provider to the fallback provider so it is not null.
+      return fallback.model; // set its defined model based on fallback logic.
+    }
+
+    // The provider was explicitly set, so check if the workspace has an agent model set.
+    if (this.invocation.workspace.agentModel) {
+      return this.invocation.workspace.agentModel;
+    }
 
-    // Provider has no reliable default (cant load many models) - so we need to look at system
-    // for the model param.
+    // If the provider we are using is not supported or does not support multi-model loading
+    // then we use the default model for the provider.
+    if (!Object.keys(this.noProviderModelDefault).includes(this.provider)) {
+      return this.providerDefault();
+    }
+
+    // Load the model from the system environment variable for providers with no multi-model loading.
     const sysModelKey = this.noProviderModelDefault[this.provider];
-    if (!!sysModelKey)
-      return process.env[sysModelKey] ?? this.providerDefault();
+    if (sysModelKey) return process.env[sysModelKey] ?? this.providerDefault();
 
-    // If all else fails - look at the provider default list
+    // Otherwise, we have no model to use - so guess a default model to use.
     return this.providerDefault();
   }
 
   #providerSetupAndCheck() {
-    this.provider = this.invocation.workspace.agentProvider;
+    this.provider = this.invocation.workspace.agentProvider ?? null; // set provider to workspace agent provider if it exists
     this.model = this.#fetchModel();
+
+    if (!this.provider)
+      throw new Error("No valid provider found for the agent.");
+
     this.log(`Start ${this.#invocationUUID}::${this.provider}:${this.model}`);
     this.checkSetup();
   }