First pass at pulling the v1.5 CLI, TUI, and Launcher clients into v2.

core/mcp/node/config.ts

@@ -1,5 +1,6 @@
 import { existsSync, readFileSync } from "fs";
 import { resolve } from "path";
+import { getDefaultMcpConfigPath } from "../../storage/store-io.js";
 import type {
   MCPConfig,
   MCPServerConfig,
@@ -211,6 +212,24 @@ function applyOverrides(
 
 export type ResolveServerConfigsMode = "single" | "multi";
 
+export function hasAdHocServerOptions(options: ServerConfigOptions): boolean {
+  return (
+    (options.target != null && options.target.length > 0) ||
+    Boolean(options.transport) ||
+    Boolean(options.serverUrl?.trim())
+  );
+}
+
+/** When no --config and no ad-hoc target, use ~/.mcp-inspector/mcp.json (same as web). */
+export function withDefaultConfigPath(
+  options: ServerConfigOptions,
+): ServerConfigOptions {
+  if (options.configPath?.trim() || hasAdHocServerOptions(options)) {
+    return options;
+  }
+  return { ...options, configPath: getDefaultMcpConfigPath() };
+}
+
 /**
  * Resolves server config(s) from options and mode. Used by all runners.
  * Single mode: one config (from file + overrides, or from args).
@@ -220,11 +239,9 @@ export function resolveServerConfigs(
   options: ServerConfigOptions,
   mode: ResolveServerConfigsMode,
 ): MCPServerConfig[] {
+  options = withDefaultConfigPath(options);
   const hasConfigPath = Boolean(options.configPath?.trim());
-  const hasAdHoc =
-    (options.target && options.target.length > 0) ||
-    Boolean(options.transport) ||
-    Boolean(options.serverUrl);
+  const hasAdHoc = hasAdHocServerOptions(options);
 
   if (mode === "single") {
     if (hasConfigPath && options.serverName) {