feat: Added openrouter provider

packages/llm/src/config.ts

@@ -2,6 +2,7 @@ import { z } from "zod";
 
 const LLMConfigSchema = z.object({
   GOOGLE_API_KEY: z.string().optional(),
+  OPENROUTER_API_KEY: z.string().optional(),
 });
 
 export const llmConfig = LLMConfigSchema.parse(process.env);

packages/llm/src/index.ts

@@ -2,3 +2,4 @@ export * from "./llm.js";
 export * from "./config.js";
 export * from "./providers/google-genai.js";
 export * from "./providers/mock.js";
+export * from "./providers/openrouter.js";

packages/llm/src/providers/openrouter.ts

@@ -0,0 +1,31 @@
+import { z } from "zod";
+import { ChatOpenRouter } from "@langchain/openrouter";
+import { ILLMProvider, LLMRequest, LLMResponse } from "../llm.js";
+import { llmConfig } from "../config.js";
+
+export class OpenRouterProvider implements ILLMProvider {
+  providerName = "OpenRouter";
+  private model: ChatOpenRouter;
+
+  constructor(apiKey?: string, modelName: string = "google/gemini-2.5-flash") {
+    const key = apiKey || llmConfig.OPENROUTER_API_KEY;
+    if (!key) {
+      throw new Error("OPENROUTER_API_KEY is required to initialize OpenRouterProvider");
+    }
+    this.model = new ChatOpenRouter({
+      apiKey: key,
+      model: modelName,
+    });
+  }
+
+  async generateStructuredResponse<T extends z.ZodTypeAny>(
+    request: LLMRequest<T>,
+  ): Promise<LLMResponse<z.infer<T>>> {
+    const structuredModel = this.model.withStructuredOutput(request.schema);
+    const result = await structuredModel.invoke([
+      { role: "system", content: request.systemPrompt },
+      { role: "user", content: request.userContext },
+    ]);
+    return { success: true, data: result as z.infer<T> };
+  }
+}