feat(browser): add MCP tool dispatch

src/browser/routes/utils.ts

@@ -0,0 +1,38 @@
+import type express from "express";
+
+export function jsonError(
+  res: express.Response,
+  status: number,
+  message: string,
+) {
+  res.status(status).json({ error: message });
+}
+
+export function toStringOrEmpty(value: unknown) {
+  return typeof value === "string" ? value.trim() : String(value ?? "").trim();
+}
+
+export function toNumber(value: unknown) {
+  if (typeof value === "number" && Number.isFinite(value)) return value;
+  if (typeof value === "string" && value.trim()) {
+    const parsed = Number(value);
+    return Number.isFinite(parsed) ? parsed : undefined;
+  }
+  return undefined;
+}
+
+export function toBoolean(value: unknown) {
+  if (typeof value === "boolean") return value;
+  if (typeof value === "string") {
+    const v = value.trim().toLowerCase();
+    if (v === "true" || v === "1" || v === "yes") return true;
+    if (v === "false" || v === "0" || v === "no") return false;
+  }
+  return undefined;
+}
+
+export function toStringArray(value: unknown): string[] | undefined {
+  if (!Array.isArray(value)) return undefined;
+  const strings = value.map((v) => toStringOrEmpty(v)).filter(Boolean);
+  return strings.length ? strings : undefined;
+}