diff --git a/pkg/config/config.go b/pkg/config/config.go
index 97e78983c..ca598fdae 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -896,12 +896,12 @@ type BaiduSearchConfig struct {
 }
 
 type WebToolsConfig struct {
-	ToolConfig  `                  yaml:"-"                      envPrefix:"PICOCLAW_TOOLS_WEB_"`
+	ToolConfig  `                   yaml:"-"                      envPrefix:"PICOCLAW_TOOLS_WEB_"`
 	Brave       BraveConfig        `yaml:"brave,omitempty"                                        json:"brave"`
 	Tavily      TavilyConfig       `yaml:"tavily,omitempty"                                       json:"tavily"`
 	Sogou       SogouConfig        `yaml:"-"                                                      json:"sogou"`
 	DuckDuckGo  DuckDuckGoConfig   `yaml:"-"                                                      json:"duckduckgo"`
-	Gemini      GeminiSearchConfig `yaml:"gemini,omitempty"                                      json:"gemini"`
+	Gemini      GeminiSearchConfig `yaml:"gemini,omitempty"                                       json:"gemini"`
 	Perplexity  PerplexityConfig   `yaml:"perplexity,omitempty"                                   json:"perplexity"`
 	SearXNG     SearXNGConfig      `yaml:"-"                                                      json:"searxng"`
 	GLMSearch   GLMSearchConfig    `yaml:"glm_search,omitempty"                                   json:"glm_search"`
diff --git a/pkg/tools/integration/web.go b/pkg/tools/integration/web.go
index 5693a106c..55a68a3a2 100644
--- a/pkg/tools/integration/web.go
+++ b/pkg/tools/integration/web.go
@@ -504,13 +504,16 @@ func (p *GeminiSearchProvider) Search(
 		return "", fmt.Errorf("failed to marshal payload: %w", err)
 	}
 
-	endpoint := fmt.Sprintf("https://generativelanguage.googleapis.com/v1beta/models/%s:generateContent", url.PathEscape(model))
+	endpoint := fmt.Sprintf(
+		"https://generativelanguage.googleapis.com/v1beta/models/%s:generateContent",
+		url.PathEscape(model),
+	)
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewBuffer(bodyBytes))
 	if err != nil {
 		return "", fmt.Errorf("failed to create request: %w", err)
 	}
 	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("x-goog-api-key", p.apiKey)
+	req.Header.Set("X-Goog-Api-Key", p.apiKey)
 	req.Header.Set("User-Agent", fmt.Sprintf(userAgentHonest, config.Version))
 
 	resp, err := p.client.Do(req)
@@ -1338,12 +1341,6 @@ func (opts WebSearchToolOptions) resolveProviderName(query string) (string, erro
 		}
 	}
 
-	for _, name := range autoFallbackWebSearchProviders {
-		if opts.providerReady(name) {
-			return name, nil
-		}
-	}
-
 	return "", nil
 }
 
diff --git a/pkg/tools/integration/web_test.go b/pkg/tools/integration/web_test.go
index 2343e2c5e..7d2fc34c0 100644
--- a/pkg/tools/integration/web_test.go
+++ b/pkg/tools/integration/web_test.go
@@ -1909,8 +1909,8 @@ func TestGeminiSearchProvider_SearchSuccess(t *testing.T) {
 				if req.Method != http.MethodPost {
 					t.Fatalf("method = %s, want POST", req.Method)
 				}
-				if got := req.Header.Get("x-goog-api-key"); got != "google-key" {
-					t.Fatalf("x-goog-api-key = %q, want google-key", got)
+				if got := req.Header.Get("X-Goog-Api-Key"); got != "google-key" {
+					t.Fatalf("X-Goog-Api-Key = %q, want google-key", got)
 				}
 				if !strings.Contains(req.URL.String(), "/models/gemini-2.5-flash:generateContent") {
 					t.Fatalf("unexpected URL: %s", req.URL.String())