diff --git a/.changeset/report-bound-http-port.md b/.changeset/report-bound-http-port.md
new file mode 100644
index 000000000..75b45f8a5
--- /dev/null
+++ b/.changeset/report-bound-http-port.md
@@ -0,0 +1,5 @@
+---
+"@upstash/context7-mcp": patch
+---
+
+Report the actual assigned HTTP port when `--port 0` requests an ephemeral port.
diff --git a/packages/mcp/src/index.ts b/packages/mcp/src/index.ts
index 6656dcbce..1d5e4009a 100644
--- a/packages/mcp/src/index.ts
+++ b/packages/mcp/src/index.ts
@@ -652,8 +652,13 @@ async function main() {
       });
 
       httpServer.once("listening", () => {
+        const address = httpServer.address();
+        if (!address || typeof address === "string") {
+          console.error("Failed to determine the bound HTTP port");
+          process.exit(1);
+        }
         console.error(
-          `Context7 Documentation MCP Server v${SERVER_VERSION} running on HTTP at http://localhost:${port}/mcp`
+          `Context7 Documentation MCP Server v${SERVER_VERSION} running on HTTP at http://localhost:${address.port}/mcp`
         );
       });
     };
diff --git a/packages/mcp/test/integration.test.ts b/packages/mcp/test/integration.test.ts
index cff8bf91c..0b787bf0a 100644
--- a/packages/mcp/test/integration.test.ts
+++ b/packages/mcp/test/integration.test.ts
@@ -188,6 +188,19 @@ afterAll(() => {
   stubServer?.close();
 });
 
+test("reports the bound port when port zero requests an ephemeral port", async () => {
+  const { child, url } = await startHttpChild({ port: 0 });
+  try {
+    expect(new URL(url).port).not.toBe("0");
+
+    const response = await fetch(new URL("/ping", url));
+    expect(response.ok).toBe(true);
+    await expect(response.json()).resolves.toMatchObject({ status: "ok" });
+  } finally {
+    child.kill();
+  }
+});
+
 async function connect(transportKind: "http" | "stdio", era: "modern" | "legacy") {
   const client = new Client(
     { name: "test-harness", version: "1.0.0" },