WIP

Author: habedi

src/agent/llm.ts

@@ -52,7 +52,7 @@ export async function getNextAssistantResponse(history: Message[], config: Confi
     try {
         return await generateText({
             model: llmProvider,
-            system: `You are a helpful AI assistant named Tobi. You can use tools to help the user with coding and file system tasks.`,
+            system: config.systemPrompt,
             // eslint-disable-next-line @typescript-eslint/no-explicit-any
             messages: truncatedHistory as any,
             experimental_telemetry: {

src/agent/state.ts

@@ -3,7 +3,7 @@ import { create } from "zustand";
 import type { Message } from "./types.js";
 import { getNextAssistantResponse } from "./llm.js";
 import { runTool } from "./tools/index.js";
-import { loadConfig, type Config, HISTORY_PATH, CONFIG_DIR } from "@/config.js";
+import { loadConfig, type Config, HISTORY_PATH } from "@/config.js";
 import type { ToolCallPart } from "ai";
 import { FatalError, ToolError, TransientError } from "./errors.js";
 import fs from "fs";

src/config.ts

@@ -24,6 +24,7 @@ const mcpServerSchema = z
     .strict();
 
 const configSchema = z.object({
+    systemPrompt: z.string().optional().describe("The global system prompt to use for the agent."),
     defaultModel: z.string().describe("The 'name' of the model to use by default."),
     models: z.array(modelSchema),
     history: z
@@ -52,6 +53,7 @@ const configSchema = z.object({
 export type Config = z.infer<typeof configSchema>;
 
 const defaultConfig: Config = {
+    systemPrompt: `You are a helpful AI assistant named Tobi. You can use tools to help the user with coding and file system tasks.`,
     defaultModel: "gpt-4.1-mini",
     models: [
         { name: "gpt-4.1-mini", provider: "openai", modelId: "gpt-4.1-mini" },
@@ -87,7 +89,10 @@ export async function loadConfig(): Promise<Config> {
     try {
         const configContent = await fs.readFile(CONFIG_PATH, "utf-8");
         const parsedConfig = json5.parse(configContent);
-        return configSchema.parse(parsedConfig);
+
+        // Merge user's config over defaults. This makes adding new keys in updates non-breaking.
+        const mergedConfig = { ...defaultConfig, ...parsedConfig };
+        return configSchema.parse(mergedConfig);
     } catch (error: unknown) {
         if (error instanceof Error && (error as NodeJS.ErrnoException).code === "ENOENT") {
             console.warn(`Configuration file not found. Creating a default one at: ${CONFIG_PATH}`);