refactor: share mcp api calls

packages/mcp-server/test/protocol.test.ts

@@ -152,6 +152,33 @@ describe("MCP protocol unstableFilter", () => {
     expect(String(calledUrl)).toContain("unstableFilter=true");
   });
 
+  test("tools/call returns API JSON as text content", async () => {
+    global.fetch = mock(() =>
+      Promise.resolve(
+        new Response(JSON.stringify([{ title: "item" }]), { status: 200 }),
+      ),
+    ) as unknown as typeof fetch;
+
+    const response = await handleMcpRequest(
+      new Request("http://localhost", {
+        method: "POST",
+        body: JSON.stringify({
+          jsonrpc: "2.0",
+          id: 1,
+          method: "tools/call",
+          params: {
+            name: "search_facebook",
+            arguments: { query: "laptop" },
+          },
+        }),
+      }),
+    );
+
+    const body = await response.json();
+    expect(body.result.content[0].type).toBe("text");
+    expect(JSON.parse(body.result.content[0].text)).toEqual([{ title: "item" }]);
+  });
+
   test("handler should forward unstableFilter=true for search_ebay", async () => {
     await handleMcpRequest(
       new Request("http://localhost", {