diff --git a/agent-schema.json b/agent-schema.json
index 7622d8b86..ce8598912 100644
--- a/agent-schema.json
+++ b/agent-schema.json
@@ -545,7 +545,7 @@
         },
         "provider_opts": {
           "type": "object",
-          "description": "Provider-specific options. Sampling parameters: top_k (integer, supported by anthropic, google, amazon-bedrock, and custom OpenAI-compatible providers like vLLM/Ollama), repetition_penalty (float, forwarded to custom OpenAI-compatible providers), min_p (float, forwarded to custom providers), seed (integer, forwarded to OpenAI). Infrastructure options: dmr: runtime_flags. anthropic/amazon-bedrock (Claude): interleaved_thinking (boolean, default true). openai: transport ('sse' or 'websocket') to choose between SSE and WebSocket streaming for the Responses API. openai/anthropic/google: rerank_prompt (string) to fully override the system prompt used for RAG reranking (advanced - prefer using results.reranking.criteria for domain-specific guidance).",
+          "description": "Provider-specific options. Sampling parameters: top_k (integer, supported by anthropic, google, amazon-bedrock, and custom OpenAI-compatible providers like vLLM/Ollama), repetition_penalty (float, forwarded to custom OpenAI-compatible providers), min_p (float, forwarded to custom providers), seed (integer, forwarded to OpenAI). Infrastructure options: dmr: runtime_flags. anthropic/amazon-bedrock (Claude): interleaved_thinking (boolean, default true). openai: transport ('sse' or 'websocket') to choose between SSE and WebSocket streaming for the Responses API. openai/anthropic/google: rerank_prompt (string) to fully override the system prompt used for RAG reranking (advanced - prefer using results.reranking.criteria for domain-specific guidance). Google: google_search (boolean) enables Google Search grounding, google_maps (boolean) enables Google Maps grounding, code_execution (boolean) enables server-side code execution.",
           "additionalProperties": true
         },
         "track_usage": {
diff --git a/docs/providers/google/index.md b/docs/providers/google/index.md
index d39a23e21..cff067ba4 100644
--- a/docs/providers/google/index.md
+++ b/docs/providers/google/index.md
@@ -89,3 +89,25 @@ models:
     model: gemini-3-flash
     thinking_budget: medium # default for Flash: minimal | low | medium | high
 ```
+
+## Built-in Tools (Grounding)
+
+Gemini models support built-in tools that let the model access Google Search and Google Maps
+directly during generation. Enable them via `provider_opts`:
+
+```yaml
+models:
+  gemini-grounded:
+    provider: google
+    model: gemini-2.5-flash
+    provider_opts:
+      google_search: true
+      google_maps: true
+      code_execution: true
+```
+
+| Option           | Description                                          |
+| ---------------- | ---------------------------------------------------- |
+| `google_search`  | Enables Google Search grounding for up-to-date info  |
+| `google_maps`    | Enables Google Maps grounding for location queries   |
+| `code_execution` | Enables server-side code execution for computations  |
diff --git a/examples/google_search_grounding.yaml b/examples/google_search_grounding.yaml
new file mode 100644
index 000000000..e3dffa1f4
--- /dev/null
+++ b/examples/google_search_grounding.yaml
@@ -0,0 +1,16 @@
+#!/usr/bin/env docker agent run
+
+models:
+  gemini:
+    provider: google
+    model: gemini-3.1-flash-lite-preview
+    provider_opts:
+      google_search: true
+
+agents:
+  root:
+    model: gemini
+    description: Gemini with Google Search
+    instruction: |
+      You are a helpful assistant with access to the latest information via Google Search.
+      Use grounded search results to provide accurate, up-to-date answers.
diff --git a/pkg/model/provider/gemini/client.go b/pkg/model/provider/gemini/client.go
index 60e54c6ea..e48e6f6e4 100644
--- a/pkg/model/provider/gemini/client.go
+++ b/pkg/model/provider/gemini/client.go
@@ -442,6 +442,28 @@ func (c *Client) applyGemini25ThinkingBudget(config *genai.GenerateContentConfig
 	slog.Debug("Gemini request using thinking_budget", "budget_tokens", tokens)
 }
 
+// builtInTools returns Gemini built-in tools (Google Search, Google Maps,
+// Code Execution) enabled via provider_opts.
+func (c *Client) builtInTools() []*genai.Tool {
+	entries := []struct {
+		key  string
+		tool *genai.Tool
+	}{
+		{"google_search", &genai.Tool{GoogleSearch: &genai.GoogleSearch{}}},
+		{"google_maps", &genai.Tool{GoogleMaps: &genai.GoogleMaps{}}},
+		{"code_execution", &genai.Tool{CodeExecution: &genai.ToolCodeExecution{}}},
+	}
+
+	var builtIn []*genai.Tool
+	for _, e := range entries {
+		if enabled, ok := providerutil.GetProviderOptBool(c.ModelConfig.ProviderOpts, e.key); ok && enabled {
+			builtIn = append(builtIn, e.tool)
+			slog.Debug("Gemini built-in tool enabled", "key", e.key)
+		}
+	}
+	return builtIn
+}
+
 // convertToolsToGemini converts tools to Gemini format
 func convertToolsToGemini(requestTools []tools.Tool) ([]*genai.Tool, error) {
 	if len(requestTools) == 0 {
@@ -533,6 +555,9 @@ func (c *Client) CreateChatCompletionStream(
 
 	config := c.buildConfig()
 
+	// Start with Google built-in tools (search, maps, code execution) from provider_opts
+	config.Tools = c.builtInTools()
+
 	// Add tools to config if provided
 	if len(requestTools) > 0 {
 		allTools, err := convertToolsToGemini(requestTools)
@@ -541,7 +566,7 @@ func (c *Client) CreateChatCompletionStream(
 			return nil, err
 		}
 
-		config.Tools = allTools
+		config.Tools = append(config.Tools, allTools...)
 
 		// Enable function calling
 		config.ToolConfig = &genai.ToolConfig{
@@ -550,6 +575,11 @@ func (c *Client) CreateChatCompletionStream(
 			},
 		}
 
+		// When mixing built-in tools with function calling, Gemini requires this flag
+		if len(config.Tools) > len(allTools) {
+			config.ToolConfig.IncludeServerSideToolInvocations = new(true)
+		}
+
 		// Debug: Log the tools we're sending
 		slog.Debug("Gemini tools config", "tools", config.Tools)
 		for _, tool := range config.Tools {
diff --git a/pkg/model/provider/gemini/client_test.go b/pkg/model/provider/gemini/client_test.go
index 2159bbcbf..2f81688bf 100644
--- a/pkg/model/provider/gemini/client_test.go
+++ b/pkg/model/provider/gemini/client_test.go
@@ -379,6 +379,98 @@ func TestConvertMessagesToGemini_ThoughtSignature(t *testing.T) {
 	}
 }
 
+func TestBuiltInTools(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name         string
+		providerOpts map[string]any
+		wantCount    int
+		wantSearch   bool
+		wantMaps     bool
+		wantCodeExec bool
+	}{
+		{
+			name:         "no built-in tools by default",
+			providerOpts: nil,
+			wantCount:    0,
+		},
+		{
+			name:         "google_search enabled",
+			providerOpts: map[string]any{"google_search": true},
+			wantCount:    1,
+			wantSearch:   true,
+		},
+		{
+			name:         "google_maps enabled",
+			providerOpts: map[string]any{"google_maps": true},
+			wantCount:    1,
+			wantMaps:     true,
+		},
+		{
+			name:         "both enabled",
+			providerOpts: map[string]any{"google_search": true, "google_maps": true},
+			wantCount:    2,
+			wantSearch:   true,
+			wantMaps:     true,
+		},
+		{
+			name:         "explicitly disabled",
+			providerOpts: map[string]any{"google_search": false, "google_maps": false},
+			wantCount:    0,
+		},
+		{
+			name:         "code_execution enabled",
+			providerOpts: map[string]any{"code_execution": true},
+			wantCount:    1,
+			wantCodeExec: true,
+		},
+		{
+			name:         "all three enabled",
+			providerOpts: map[string]any{"google_search": true, "google_maps": true, "code_execution": true},
+			wantCount:    3,
+			wantSearch:   true,
+			wantMaps:     true,
+			wantCodeExec: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			client := &Client{
+				Config: base.Config{
+					ModelConfig: latest.ModelConfig{
+						Provider:     "google",
+						Model:        "gemini-2.5-flash",
+						ProviderOpts: tt.providerOpts,
+					},
+				},
+			}
+
+			result := client.builtInTools()
+			assert.Len(t, result, tt.wantCount)
+
+			var hasSearch, hasMaps, hasCodeExec bool
+			for _, tool := range result {
+				if tool.GoogleSearch != nil {
+					hasSearch = true
+				}
+				if tool.GoogleMaps != nil {
+					hasMaps = true
+				}
+				if tool.CodeExecution != nil {
+					hasCodeExec = true
+				}
+			}
+			assert.Equal(t, tt.wantSearch, hasSearch, "GoogleSearch")
+			assert.Equal(t, tt.wantMaps, hasMaps, "GoogleMaps")
+			assert.Equal(t, tt.wantCodeExec, hasCodeExec, "CodeExecution")
+		})
+	}
+}
+
 func TestBuildConfig_ThinkingFromBudget(t *testing.T) {
 	t.Parallel()
 
diff --git a/pkg/model/provider/providerutil/provider_opts.go b/pkg/model/provider/providerutil/provider_opts.go
index 8235fdd71..bc597e2a8 100644
--- a/pkg/model/provider/providerutil/provider_opts.go
+++ b/pkg/model/provider/providerutil/provider_opts.go
@@ -67,6 +67,28 @@ func GetProviderOptInt64(opts map[string]any, key string) (int64, bool) {
 	}
 }
 
+// GetProviderOptBool extracts a bool value from provider opts.
+func GetProviderOptBool(opts map[string]any, key string) (bool, bool) {
+	if opts == nil {
+		return false, false
+	}
+	v, ok := opts[key]
+	if !ok {
+		return false, false
+	}
+	switch b := v.(type) {
+	case bool:
+		return b, true
+	default:
+		slog.Debug("provider_opts type mismatch, ignoring",
+			"key", key,
+			"expected_type", "bool",
+			"actual_type", fmt.Sprintf("%T", v),
+			"value", v)
+		return false, false
+	}
+}
+
 // samplingProviderOptsKeys lists the provider_opts keys that are
 // treated as sampling parameters and forwarded to provider APIs.
 // Provider-specific infrastructure keys (api_type, transport, region, etc.)
diff --git a/pkg/model/provider/providerutil/provider_opts_test.go b/pkg/model/provider/providerutil/provider_opts_test.go
index bbd27d9c8..7b59af121 100644
--- a/pkg/model/provider/providerutil/provider_opts_test.go
+++ b/pkg/model/provider/providerutil/provider_opts_test.go
@@ -33,6 +33,32 @@ func TestGetProviderOptFloat64(t *testing.T) {
 	}
 }
 
+func TestGetProviderOptBool(t *testing.T) {
+	tests := []struct {
+		name   string
+		opts   map[string]any
+		key    string
+		want   bool
+		wantOK bool
+	}{
+		{"nil opts", nil, "google_search", false, false},
+		{"missing key", map[string]any{}, "google_search", false, false},
+		{"true value", map[string]any{"google_search": true}, "google_search", true, true},
+		{"false value", map[string]any{"google_search": false}, "google_search", false, true},
+		{"string value", map[string]any{"google_search": "true"}, "google_search", false, false},
+		{"int value", map[string]any{"google_search": 1}, "google_search", false, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, ok := GetProviderOptBool(tt.opts, tt.key)
+			assert.Equal(t, tt.wantOK, ok)
+			if ok {
+				assert.Equal(t, tt.want, got)
+			}
+		})
+	}
+}
+
 func TestGetProviderOptInt64(t *testing.T) {
 	tests := []struct {
 		name   string