feat: add routed online search providers

tests/exa-override.test.ts

@@ -0,0 +1,42 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { createExaToolApiOverride, mapExaToolName, prefixExaTool } from "../extensions/exa-tool-prefix.ts";
+
+test("Exa tools use a provider prefix followed by the original semantic name", () => {
+	assert.equal(mapExaToolName("web_search_exa"), "exa_web_search");
+	assert.equal(mapExaToolName("web_fetch_exa"), "exa_web_fetch");
+	assert.equal(mapExaToolName("web_search_advanced_exa"), "exa_web_search_advanced");
+	assert.equal(mapExaToolName("unrelated_tool"), "unrelated_tool");
+
+	const tool = prefixExaTool({ name: "web_search_exa", label: "MCP: web_search_exa" });
+	assert.equal(tool.name, "exa_web_search");
+	assert.equal(tool.label, "Exa Web Search");
+});
+
+test("Exa API override keeps registered and active tool names aligned", () => {
+	const registered: Array<{ name: string; label: string }> = [];
+	let active: string[] = [];
+	const unregistered: string[] = [];
+	const api = createExaToolApiOverride({
+		registerTool(tool: unknown) {
+			registered.push(tool as { name: string; label: string });
+		},
+		setActiveTools(names: string[]) {
+			active = names;
+		},
+		unregisterTool(name: string) {
+			unregistered.push(name);
+			return true;
+		},
+	});
+
+	api.registerTool({ name: "web_fetch_exa", label: "MCP: web_fetch_exa" });
+	api.setActiveTools(["read", "web_fetch_exa", "web_fetch_exa"]);
+	api.unregisterTool("web_fetch_exa");
+
+	assert.equal(registered[0]?.name, "exa_web_fetch");
+	assert.equal(registered[0]?.label, "Exa Web Fetch");
+	assert.deepEqual(active, ["read", "exa_web_fetch"]);
+	assert.deepEqual(unregistered, ["exa_web_fetch"]);
+});