diff --git a/coworker/web/__init__.py b/coworker/web/__init__.py
index e397eab8..0cededf9 100644
--- a/coworker/web/__init__.py
+++ b/coworker/web/__init__.py
@@ -7,6 +7,7 @@
     DuckDuckGoProvider,
     SearchResult,
     TavilyProvider,
+    SerperProvider,
     WebSearchProvider,
     build_provider,
     provider_names,
@@ -20,6 +21,7 @@
     "DuckDuckGoProvider",
     "TavilyProvider",
     "BraveProvider",
+    "SerperProvider",
     "build_provider",
     "provider_names",
     "make_web_search_tool",
diff --git a/coworker/web/providers.py b/coworker/web/providers.py
index 23cad857..369f2756 100644
--- a/coworker/web/providers.py
+++ b/coworker/web/providers.py
@@ -108,10 +108,41 @@ def search(self, query: str, max_results: int = 5) -> list[SearchResult]:
         ]
 
 
+class SerperProvider(WebSearchProvider):
+    name = "serper"
+    requires_key = True
+
+    def __init__(self, api_key: str) -> None:
+        self.api_key = api_key
+
+    def search(self, query: str, max_results: int = 5) -> list[SearchResult]:
+        import httpx
+
+        resp = httpx.post(
+            "https://google.serper.dev/search",
+            headers={
+                "X-API-KEY": self.api_key,
+                "Content-Type": "application/json",
+            },
+            json={"q": query, "num": max_results},
+            timeout=_TIMEOUT,
+        )
+        data = resp.json()
+        return [
+            SearchResult(
+                title=r.get("title", ""),
+                url=r.get("link", ""),
+                snippet=r.get("snippet", ""),
+            )
+            for r in data.get("organic", [])
+        ]
+
+
 _PROVIDERS = {
     "duckduckgo": DuckDuckGoProvider,
     "tavily": TavilyProvider,
     "brave": BraveProvider,
+    "serper": SerperProvider,
 }
 
 
diff --git a/surfaces/gui/package-lock.json b/surfaces/gui/package-lock.json
index 56baf1e1..0732b119 100644
--- a/surfaces/gui/package-lock.json
+++ b/surfaces/gui/package-lock.json
@@ -21,6 +21,7 @@
         "@tauri-apps/cli": "^2.11.2",
         "@testing-library/dom": "^10.4.1",
         "@testing-library/react": "^16.3.2",
+        "@types/node": "^26.1.1",
         "@types/react": "^18.3.3",
         "@types/react-dom": "^18.3.0",
         "@vitejs/plugin-react": "^4.3.1",
@@ -1941,6 +1942,16 @@
       "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "26.1.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.1.tgz",
+      "integrity": "sha512-nxAkRSVkN1Y0JC1W8ky/fTfkGsMmcrRsbx+3XoZE+rMOX71kLYTV7fLXpqud1GpbpP5TuffXFqfX7fH2GgZREw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~8.3.0"
+      }
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.15",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.15.tgz",
@@ -5618,6 +5629,13 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici-types": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/unified": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",
diff --git a/surfaces/gui/package.json b/surfaces/gui/package.json
index c909514d..80f81bc5 100644
--- a/surfaces/gui/package.json
+++ b/surfaces/gui/package.json
@@ -27,6 +27,7 @@
     "@tauri-apps/cli": "^2.11.2",
     "@testing-library/dom": "^10.4.1",
     "@testing-library/react": "^16.3.2",
+    "@types/node": "^26.1.1",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
diff --git a/surfaces/gui/src/components/Composer.tsx b/surfaces/gui/src/components/Composer.tsx
index 852e4d6f..75683fc2 100644
--- a/surfaces/gui/src/components/Composer.tsx
+++ b/surfaces/gui/src/components/Composer.tsx
@@ -30,7 +30,7 @@ const PERMISSION_OPTIONS: Option[] = [
 // goes stale and silently offers ids the backend never confirmed (caught 2026-07-21).
 
 // Drop the provider prefix for display (anthropic:claude-opus-4-8 → claude-opus-4-8); full id on hover.
-const shortModel = (m: string) => (m.includes(":") ? m.split(":").slice(1).join(":") : m);
+const shortModel = (m?: string) => (m && m.includes(":") ? m.split(":").slice(1).join(":") : m || "");
 
 // Identify an attachment by name + payload size so duplicates (e.g. the same file picked twice,
 // or a prefill applied twice) collapse to one chip.
@@ -323,10 +323,12 @@ export function Composer(props: Props) {
   const modelsLoaded = !!(props.models && props.models.length);
   const modelOptions: Option[] = Array.from(
     new Set([props.model, ...(props.models || [])]),
-  ).map((m) => ({
-    value: m,
-    label: props.modelLabels?.[m] || shortModel(m),
-  }));
+  )
+    .filter(Boolean)
+    .map((m) => ({
+      value: m,
+      label: props.modelLabels?.[m] || shortModel(m),
+    }));
 
   const iconBtn =
     "w-7 h-7 grid place-items-center rounded-md text-muted hover:text-ink hover:bg-paper shrink-0";
@@ -516,8 +518,15 @@ export function Composer(props: Props) {
 
           {/* send / stop */}
           {props.running ? (
-            <button className="btn danger" onClick={props.onInterrupt}>
-              ⏹ Stop
+            <button
+              className="w-7 h-7 rounded-full grid place-items-center shrink-0 bg-red-50 text-red-600 hover:bg-red-100 border border-red-200 transition-colors"
+              onClick={props.onInterrupt}
+              title="Stop running"
+              aria-label="Stop"
+            >
+              <svg width="10" height="10" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
+                <rect x="4" y="4" width="16" height="16" rx="2" />
+              </svg>
             </button>
           ) : (
             <button
diff --git a/tests/test_web_search.py b/tests/test_web_search.py
index d1c2d0fd..63d1a055 100644
--- a/tests/test_web_search.py
+++ b/tests/test_web_search.py
@@ -19,6 +19,7 @@
     BraveProvider,
     DuckDuckGoProvider,
     TavilyProvider,
+    SerperProvider,
     WebSearchProvider,
 )
 
@@ -79,6 +80,9 @@ def test_build_provider_third_party_requires_key():
         build_provider("tavily")  # no key
     assert isinstance(build_provider("tavily", "tvly-x"), TavilyProvider)
     assert isinstance(build_provider("brave", "brv-x"), BraveProvider)
+    with pytest.raises(ValueError):
+        build_provider("serper")  # no key
+    assert isinstance(build_provider("serper", "serp-x"), SerperProvider)
 
 
 def test_tool_surfaces_missing_key_error(tmp_path):
@@ -152,3 +156,44 @@ def stream(self, **_kw):
         from coworker.providers.base import StreamChunk
 
         yield StreamChunk(turn=self.complete())
+
+
+def test_serper_search_calls_api(monkeypatch):
+    from unittest.mock import MagicMock
+    import httpx
+    from coworker.web.providers import SerperProvider
+
+    mock_resp = MagicMock()
+    mock_resp.json.return_value = {
+        "organic": [
+            {"title": "Result 1", "link": "https://r1", "snippet": "Snippet 1"},
+            {"title": "Result 2", "link": "https://r2", "snippet": "Snippet 2"},
+        ]
+    }
+    
+    post_calls = []
+
+    def mock_post(url, headers, json, timeout):
+        post_calls.append((url, headers, json, timeout))
+        return mock_resp
+
+    monkeypatch.setattr(httpx, "post", mock_post)
+
+    provider = SerperProvider("test-key")
+    results = provider.search("python news", max_results=2)
+
+    assert len(results) == 2
+    assert results[0].title == "Result 1"
+    assert results[0].url == "https://r1"
+    assert results[0].snippet == "Snippet 1"
+    assert results[1].title == "Result 2"
+    assert results[1].url == "https://r2"
+    assert results[1].snippet == "Snippet 2"
+
+    assert len(post_calls) == 1
+    url, headers, json_body, timeout = post_calls[0]
+    assert url == "https://google.serper.dev/search"
+    assert headers["X-API-KEY"] == "test-key"
+    assert headers["Content-Type"] == "application/json"
+    assert json_body == {"q": "python news", "num": 2}
+