diff --git a/lib/n8n_openai_adapter/router.ex b/lib/n8n_openai_adapter/router.ex
index 92fdf8325a..648a0af80f 100644
--- a/lib/n8n_openai_adapter/router.ex
+++ b/lib/n8n_openai_adapter/router.ex
@@ -145,6 +145,18 @@ defmodule N8nOpenaiAdapter.Router do
 
   # --- Admin API (separate ADMIN_API_KEY) ---
 
+  get "/admin" do
+    case authorize_admin!(conn) do
+      {:halt, conn} ->
+        conn
+
+      conn ->
+        conn
+        |> put_resp_content_type("text/html")
+        |> send_resp(200, admin_page())
+    end
+  end
+
   get "/admin/agents" do
     case authorize_admin!(conn) do
       {:halt, conn} ->
@@ -255,4 +267,111 @@ defmodule N8nOpenaiAdapter.Router do
         end
     end
   end
+
+  # Self-contained admin page: lists agents and lets you add/remove them via
+  # the admin API. Uses the ADMIN_API_KEY (entered in the page) as the Bearer
+  # token for the /admin/agents calls.
+  defp admin_page do
+    """
+    <!doctype html>
+    <html lang="en">
+    <head>
+      <meta charset="utf-8">
+      <meta name="viewport" content="width=device-width, initial-scale=1">
+      <title>n8n OpenAI Adapter — Agents</title>
+      <style>
+        body { font-family: system-ui, sans-serif; max-width: 720px; margin: 2rem auto; padding: 0 1rem; color: #1a1a1a; }
+        h1 { font-size: 1.4rem; }
+        input[type=text], input[type=password] { width: 100%; padding: .5rem; margin: .25rem 0 .75rem; box-sizing: border-box; }
+        button { padding: .5rem 1rem; cursor: pointer; }
+        table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
+        th, td { text-align: left; padding: .5rem; border-bottom: 1px solid #ddd; }
+        .msg { margin-top: 1rem; padding: .5rem; border-radius: 4px; }
+        .ok { background: #e6f4ea; color: #1e7e34; }
+        .err { background: #fdecea; color: #c62828; }
+        .del { color: #c62828; background: none; border: none; cursor: pointer; }
+      </style>
+    </head>
+    <body>
+      <h1>n8n OpenAI Adapter — Agents</h1>
+      <p>Manage which n8n chat agents are exposed as OpenAI models.</p>
+
+      <label for="key">Admin API key</label>
+      <input type="password" id="key" placeholder="ADMIN_API_KEY" autocomplete="off">
+      <button onclick="loadAgents()">Load agents</button>
+
+      <h2>Add / update agent</h2>
+      <label for="model">Model name</label>
+      <input type="text" id="model" placeholder="e.g. scholar-agent">
+      <label for="webhook">n8n chat webhook URL</label>
+      <input type="text" id="webhook" placeholder="https://n8n.bueso.eu/webhook/<id>/chat">
+      <button onclick="saveAgent()">Save agent</button>
+
+      <div id="msg"></div>
+
+      <h2>Configured agents</h2>
+      <table id="agents"><thead><tr><th>Model</th><th>Webhook</th><th></th></tr></thead><tbody></tbody></table>
+
+      <script>
+        const key = () => document.getElementById('key').value.trim();
+        const msg = (text, ok) => {
+          const el = document.getElementById('msg');
+          el.className = 'msg ' + (ok ? 'ok' : 'err');
+          el.textContent = text;
+        };
+        const auth = () => ({ 'Authorization': 'Bearer ' + key(), 'Content-Type': 'application/json' });
+
+        async function loadAgents() {
+          if (!key()) return msg('Enter the admin API key first', false);
+          try {
+            const r = await fetch('/admin/agents', { headers: auth() });
+            if (!r.ok) return msg('Failed to load agents: HTTP ' + r.status, false);
+            const data = await r.json();
+            const tbody = document.querySelector('#agents tbody');
+            tbody.innerHTML = '';
+            for (const [model, webhook] of Object.entries(data.agents)) {
+              const tr = document.createElement('tr');
+              tr.innerHTML = '<td>' + model + '</td><td>' + webhook + '</td>' +
+                '<td><button class="del" onclick="deleteAgent(\\'' + model + '\\')">Delete</button></td>';
+              tbody.appendChild(tr);
+            }
+            msg('Loaded ' + Object.keys(data.agents).length + ' agent(s)', true);
+          } catch (e) { msg('Error: ' + e, false); }
+        }
+
+        async function saveAgent() {
+          const model = document.getElementById('model').value.trim();
+          const webhook = document.getElementById('webhook').value.trim();
+          if (!key()) return msg('Enter the admin API key first', false);
+          if (!model || !webhook) return msg('Model and webhook are required', false);
+          try {
+            const r = await fetch('/admin/agents', {
+              method: 'POST', headers: auth(),
+              body: JSON.stringify({ model, webhook })
+            });
+            if (!r.ok) return msg('Failed to save agent: HTTP ' + r.status, false);
+            document.getElementById('model').value = '';
+            document.getElementById('webhook').value = '';
+            msg('Saved agent "' + model + '"', true);
+            loadAgents();
+          } catch (e) { msg('Error: ' + e, false); }
+        }
+
+        async function deleteAgent(model) {
+          if (!key()) return msg('Enter the admin API key first', false);
+          if (!confirm('Delete agent "' + model + '"?')) return;
+          try {
+            const r = await fetch('/admin/agents/' + encodeURIComponent(model), {
+              method: 'DELETE', headers: auth()
+            });
+            if (!r.ok) return msg('Failed to delete: HTTP ' + r.status, false);
+            msg('Deleted agent "' + model + '"', true);
+            loadAgents();
+          } catch (e) { msg('Error: ' + e, false); }
+        }
+      </script>
+    </body>
+    </html>
+    """
+  end
 end
diff --git a/test/router_test.exs b/test/router_test.exs
index e810a52943..69da3162a0 100644
--- a/test/router_test.exs
+++ b/test/router_test.exs
@@ -63,6 +63,26 @@ defmodule N8nOpenaiAdapter.RouterTest do
     assert conn.status == 400
   end
 
+  test "GET /admin serves the web admin page (admin key)" do
+    conn =
+      conn(:get, "/admin")
+      |> put_req_header("authorization", "Bearer test-admin-key")
+      |> Router.call(Router.init([]))
+
+    assert conn.status == 200
+    assert conn.resp_body =~ "n8n OpenAI Adapter"
+    assert conn.resp_body =~ "admin/agents"
+  end
+
+  test "GET /admin rejects a non-admin key" do
+    conn =
+      conn(:get, "/admin")
+      |> put_req_header("authorization", "Bearer test-key")
+      |> Router.call(Router.init([]))
+
+    assert conn.status == 401
+  end
+
   # --- Admin API ---
 
   test "GET /admin/agents lists agents (admin key)" do