feat: add web_search tool

.pi/agent/extensions/web-search/index.ts

@@ -0,0 +1,28 @@
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+import { loadWebSearchConfig } from "./src/config.ts";
+import { createExaProvider } from "./src/providers/exa.ts";
+import type { WebProvider } from "./src/providers/types.ts";
+import { createWebSearchTool } from "./src/tools/web-search.ts";
+
+async function resolveProvider(providerName?: string): Promise<WebProvider> {
+  const config = await loadWebSearchConfig();
+  const selectedName = providerName ?? config.defaultProviderName;
+  const providerConfig = config.providersByName.get(selectedName);
+
+  if (!providerConfig) {
+    throw new Error(
+      `Unknown web-search provider \"${selectedName}\". Configured providers: ${[...config.providersByName.keys()].join(", ")}`,
+    );
+  }
+
+  switch (providerConfig.type) {
+    case "exa":
+      return createExaProvider(providerConfig);
+    default:
+      throw new Error(`Unsupported web-search provider type: ${(providerConfig as { type: string }).type}`);
+  }
+}
+
+export default function webSearch(pi: ExtensionAPI) {
+  pi.registerTool(createWebSearchTool({ resolveProvider }));
+}