diff --git a/app/web/router.py b/app/web/router.py
index 9bf5a92..80d5030 100644
--- a/app/web/router.py
+++ b/app/web/router.py
@@ -883,6 +883,28 @@ async def admin_marketplaces_page(
     return templates.TemplateResponse(request, "admin_marketplaces.html", ctx)
 
 
+@router.get("/admin/welcome", response_class=HTMLResponse)
+async def admin_welcome_page(
+    request: Request,
+    user: dict = Depends(require_admin),
+    conn: duckdb.DuckDBPyConnection = Depends(_get_db),
+):
+    from src.repositories.welcome_template import WelcomeTemplateRepository
+    from src.welcome_template import _load_default_template
+
+    row = WelcomeTemplateRepository(conn).get()
+    ctx = _build_context(
+        request,
+        user=user,
+        current=row["content"] or "",
+        default_template=_load_default_template(),
+        updated_at=row["updated_at"],
+        updated_by=row["updated_by"],
+        is_override=row["content"] is not None,
+    )
+    return templates.TemplateResponse(request, "admin_welcome.html", ctx)
+
+
 @router.get("/tokens", response_class=HTMLResponse)
 async def my_tokens_page(
     request: Request,
diff --git a/app/web/templates/_app_header.html b/app/web/templates/_app_header.html
index 5f5a4d6..52f8f47 100644
--- a/app/web/templates/_app_header.html
+++ b/app/web/templates/_app_header.html
@@ -14,7 +14,7 @@
         <a class="app-nav-link {% if _path.startswith('/install') %}is-active{% endif %}" href="/install">Install CLI</a>
         {% if session.user.is_admin %}
         <a class="app-nav-link {% if _path.startswith('/admin/marketplaces') %}is-active{% endif %}" href="/admin/marketplaces">Marketplaces</a>
-        {% set _admin_active = _path.startswith('/admin/tables') or _path.startswith('/admin/tokens') or _path.startswith('/admin/users') or _path.startswith('/admin/groups') or _path.startswith('/admin/access') or _path.startswith('/admin/server-config') %}
+        {% set _admin_active = _path.startswith('/admin/tables') or _path.startswith('/admin/tokens') or _path.startswith('/admin/users') or _path.startswith('/admin/groups') or _path.startswith('/admin/access') or _path.startswith('/admin/server-config') or _path.startswith('/admin/welcome') %}
         <div class="app-nav-menu" id="adminNavMenu">
             <button type="button"
                     class="app-nav-link app-nav-menu-trigger {% if _admin_active %}is-active{% endif %}"
@@ -32,6 +32,7 @@
                 <a class="app-nav-menu-item {% if _path.startswith('/admin/groups') %}is-active{% endif %}" role="menuitem" href="/admin/groups">Groups</a>
                 <a class="app-nav-menu-item {% if _path.startswith('/admin/access') %}is-active{% endif %}" role="menuitem" href="/admin/access">Resource access</a>
                 <a class="app-nav-menu-item {% if _path.startswith('/admin/server-config') %}is-active{% endif %}" role="menuitem" href="/admin/server-config">Server config</a>
+                <a class="app-nav-menu-item {% if _path.startswith('/admin/welcome') %}is-active{% endif %}" role="menuitem" href="/admin/welcome">Welcome prompt</a>
             </div>
         </div>
         {% endif %}
diff --git a/app/web/templates/admin_welcome.html b/app/web/templates/admin_welcome.html
new file mode 100644
index 0000000..e7dc16e
--- /dev/null
+++ b/app/web/templates/admin_welcome.html
@@ -0,0 +1,90 @@
+{% extends "base.html" %}
+{% block title %}Welcome Prompt — Admin{% endblock %}
+{% block content %}
+<div class="admin-page">
+  <h1>Analyst Welcome Prompt</h1>
+  <p class="muted">
+    This is the CLAUDE.md generated for analysts when they run
+    <code>da analyst setup</code>. Edit it to customize the onboarding
+    instructions for this instance. Leave empty (or click <em>Reset to default</em>)
+    to use the OSS-shipped default.
+  </p>
+
+  {% if is_override %}
+    <p class="status">
+      Overridden by <strong>{{ updated_by }}</strong> on
+      {{ updated_at.strftime("%Y-%m-%d %H:%M UTC") if updated_at else "—" }}.
+    </p>
+  {% else %}
+    <p class="status">Using shipped default.</p>
+  {% endif %}
+
+  <h2>Available placeholders</h2>
+  <pre class="placeholder-cheatsheet">
+{{ "{{ instance.name }}" }}                 — instance display name
+{{ "{{ instance.subtitle }}" }}             — operator name
+{{ "{{ server.url }}" }}                    — full server URL
+{{ "{{ server.hostname }}" }}               — host part
+{{ "{{ sync_interval }}" }}                 — refresh cadence (instance.yaml)
+{{ "{{ data_source.type }}" }}              — keboola | bigquery | local
+{{ "{{ tables }}" }}                        — list of {name, description, query_mode}
+{{ "{{ metrics.count }}" }}, {{ "{{ metrics.categories }}" }}
+{{ "{{ marketplaces }}" }}                  — RBAC-filtered list of {slug, name, plugins[]}
+{{ "{{ user.email }}" }}, {{ "{{ user.name }}" }}, {{ "{{ user.is_admin }}" }}, {{ "{{ user.groups }}" }}
+{{ "{{ now }}" }}, {{ "{{ today }}" }}
+  </pre>
+
+  <form id="welcome-form" onsubmit="return false">
+    <textarea id="content" rows="30" cols="100">{{ current or default_template }}</textarea>
+    <div class="actions">
+      <button type="button" id="save-btn">Save override</button>
+      <button type="button" id="reset-btn" class="secondary">Reset to default</button>
+      <button type="button" id="preview-btn" class="secondary">Preview</button>
+    </div>
+    <div id="result" class="result"></div>
+    <pre id="preview" class="preview" hidden></pre>
+  </form>
+</div>
+
+<script>
+  const $ = (id) => document.getElementById(id);
+  const result = $("result");
+
+  $("save-btn").addEventListener("click", async () => {
+    result.textContent = "Saving…";
+    const r = await fetch("/api/admin/welcome-template", {
+      method: "PUT",
+      headers: {"Content-Type": "application/json"},
+      body: JSON.stringify({content: $("content").value}),
+    });
+    if (r.ok) {
+      result.textContent = "Saved.";
+    } else {
+      const err = await r.json();
+      result.textContent = "Error: " + (err.detail || r.statusText);
+    }
+  });
+
+  $("reset-btn").addEventListener("click", async () => {
+    if (!confirm("Reset to OSS default? Your override will be lost.")) return;
+    const r = await fetch("/api/admin/welcome-template", {method: "DELETE"});
+    if (r.ok) {
+      result.textContent = "Reset. Reload to see the default.";
+    } else {
+      result.textContent = "Error: " + r.statusText;
+    }
+  });
+
+  $("preview-btn").addEventListener("click", async () => {
+    const r = await fetch("/api/welcome?server_url=" + encodeURIComponent(window.location.origin));
+    if (r.ok) {
+      const j = await r.json();
+      $("preview").textContent = j.content;
+      $("preview").hidden = false;
+    } else {
+      const err = await r.json();
+      result.textContent = "Render error: " + (err.detail || r.statusText);
+    }
+  });
+</script>
+{% endblock %}