diff --git a/plugins/wasm-go/extensions/ai-statistics/main.go b/plugins/wasm-go/extensions/ai-statistics/main.go
index 68511fe4e..121bad10e 100644
--- a/plugins/wasm-go/extensions/ai-statistics/main.go
+++ b/plugins/wasm-go/extensions/ai-statistics/main.go
@@ -132,13 +132,13 @@ const (
 	ToolCallsPathStreaming    = "choices.0.delta.tool_calls"
 
 	// Claude/Anthropic tool calls paths (streaming)
-	ClaudeEventType              = "type"
-	ClaudeContentBlockType       = "content_block.type"
-	ClaudeContentBlockID         = "content_block.id"
-	ClaudeContentBlockName       = "content_block.name"
-	ClaudeContentBlockInput      = "content_block.input"
-	ClaudeDeltaPartialJSON       = "delta.partial_json"
-	ClaudeIndex                  = "index"
+	ClaudeEventType         = "type"
+	ClaudeContentBlockType  = "content_block.type"
+	ClaudeContentBlockID    = "content_block.id"
+	ClaudeContentBlockName  = "content_block.name"
+	ClaudeContentBlockInput = "content_block.input"
+	ClaudeDeltaPartialJSON  = "delta.partial_json"
+	ClaudeIndex             = "index"
 
 	// Reasoning paths
 	ReasoningPathNonStreaming = "choices.0.message.reasoning_content"
@@ -154,10 +154,10 @@ func getDefaultAttributes() []Attribute {
 	return []Attribute{
 		// Extract complete conversation history from request body
 		{
-			Key:        "messages",
+			Key:         "messages",
 			ValueSource: RequestBody,
-			Value:      "messages",
-			ApplyToLog: true,
+			Value:       "messages",
+			ApplyToLog:  true,
 		},
 		// Built-in attributes (no value_source needed, will be auto-extracted)
 		{
@@ -259,10 +259,10 @@ func extractSessionId(customHeader string) string {
 
 // ToolCall represents a single tool call in the response
 type ToolCall struct {
-	Index    int                    `json:"index,omitempty"`
-	ID       string                 `json:"id,omitempty"`
-	Type     string                 `json:"type,omitempty"`
-	Function ToolCallFunction       `json:"function,omitempty"`
+	Index    int              `json:"index,omitempty"`
+	ID       string           `json:"id,omitempty"`
+	Type     string           `json:"type,omitempty"`
+	Function ToolCallFunction `json:"function,omitempty"`
 }
 
 // ToolCallFunction represents the function details in a tool call
@@ -297,7 +297,7 @@ func extractStreamingToolCalls(data []byte, buffer *StreamingToolCallsBuffer) *S
 
 		for _, tcResult := range toolCallsResult.Array() {
 			index := int(tcResult.Get("index").Int())
-			
+
 			// Get or create tool call entry
 			tc, exists := buffer.ToolCalls[index]
 			if !exists {
@@ -350,10 +350,10 @@ func extractClaudeStreamingToolCalls(data []byte, buffer *StreamingToolCallsBuff
 			contentBlockType := gjson.GetBytes(chunk, ClaudeContentBlockType)
 			if contentBlockType.Exists() && contentBlockType.String() == "tool_use" {
 				index := int(gjson.GetBytes(chunk, ClaudeIndex).Int())
-				
+
 				// Create tool call entry
 				tc := &ToolCall{Index: index}
-				
+
 				// Extract id and name
 				if id := gjson.GetBytes(chunk, ClaudeContentBlockID).String(); id != "" {
 					tc.ID = id
@@ -362,11 +362,11 @@ func extractClaudeStreamingToolCalls(data []byte, buffer *StreamingToolCallsBuff
 					tc.Function.Name = name
 				}
 				tc.Type = "tool_use"
-				
+
 				buffer.ToolCalls[index] = tc
 				buffer.InToolBlock[index] = true
 				buffer.ArgumentsBuffer[index] = ""
-				
+
 				// Try to extract initial input if present
 				if input := gjson.GetBytes(chunk, ClaudeContentBlockInput); input.Exists() {
 					if inputMap, ok := input.Value().(map[string]interface{}); ok {
@@ -393,7 +393,7 @@ func extractClaudeStreamingToolCalls(data []byte, buffer *StreamingToolCallsBuff
 			index := int(gjson.GetBytes(chunk, ClaudeIndex).Int())
 			if buffer.InToolBlock[index] {
 				buffer.InToolBlock[index] = false
-				
+
 				// Parse accumulated arguments and set them
 				if tc, exists := buffer.ToolCalls[index]; exists {
 					tc.Function.Arguments = buffer.ArgumentsBuffer[index]
@@ -555,7 +555,7 @@ func parseConfig(configJson gjson.Result, config *AIStatisticsConfig) error {
 	if configJson.Get("value_length_limit").Exists() {
 		config.valueLengthLimit = int(configJson.Get("value_length_limit").Int())
 	} else {
-		config.valueLengthLimit = 4000
+		config.valueLengthLimit = 32000
 	}
 
 	// Parse attributes or use defaults
@@ -843,7 +843,7 @@ func onHttpStreamingBody(ctx wrapper.HttpContext, config AIStatisticsConfig, dat
 			setSpanAttribute(ArmsModelName, usage.Model)
 			setSpanAttribute(ArmsInputToken, usage.InputToken)
 			setSpanAttribute(ArmsOutputToken, usage.OutputToken)
-			
+
 			// Set token details to context for later use in attributes
 			if len(usage.InputTokenDetails) > 0 {
 				ctx.SetContext(tokenusage.CtxKeyInputTokenDetails, usage.InputTokenDetails)
@@ -851,6 +851,9 @@ func onHttpStreamingBody(ctx wrapper.HttpContext, config AIStatisticsConfig, dat
 			if len(usage.OutputTokenDetails) > 0 {
 				ctx.SetContext(tokenusage.CtxKeyOutputTokenDetails, usage.OutputTokenDetails)
 			}
+
+			// Write once
+			_ = ctx.WriteUserAttributeToLogWithKey(wrapper.AILogKey)
 		}
 	}
 	// If the end of the stream is reached, record metrics/logs/spans.
@@ -907,7 +910,7 @@ func onHttpResponseBody(ctx wrapper.HttpContext, config AIStatisticsConfig, body
 			setSpanAttribute(ArmsInputToken, usage.InputToken)
 			setSpanAttribute(ArmsOutputToken, usage.OutputToken)
 			setSpanAttribute(ArmsTotalToken, usage.TotalToken)
-			
+
 			// Set token details to context for later use in attributes
 			if len(usage.InputTokenDetails) > 0 {
 				ctx.SetContext(tokenusage.CtxKeyInputTokenDetails, usage.InputTokenDetails)
@@ -975,7 +978,7 @@ func setAttributeBySource(ctx wrapper.HttpContext, config AIStatisticsConfig, so
 		if (value == nil || value == "") && attribute.DefaultValue != "" {
 			value = attribute.DefaultValue
 		}
-		
+
 		// Format value for logging/span
 		var formattedValue interface{}
 		switch v := value.(type) {
@@ -994,7 +997,7 @@ func setAttributeBySource(ctx wrapper.HttpContext, config AIStatisticsConfig, so
 				formattedValue = fmt.Sprint(value)[:config.valueLengthLimit/2] + " [truncated] " + fmt.Sprint(value)[len(fmt.Sprint(value))-config.valueLengthLimit/2:]
 			}
 		}
-		
+
 		log.Debugf("[attribute] source type: %s, key: %s, value: %+v", source, key, formattedValue)
 		if attribute.ApplyToLog {
 			if attribute.AsSeparateLogField {
@@ -1124,7 +1127,7 @@ func getBuiltinAttributeFallback(ctx wrapper.HttpContext, config AIStatisticsCon
 			// Also try Claude format (both formats can be checked)
 			buffer = extractClaudeStreamingToolCalls(body, buffer)
 			ctx.SetContext(CtxStreamingToolCallsBuffer, buffer)
-			
+
 			// Also set tool_calls to user attributes so they appear in ai_log
 			toolCalls := getToolCallsFromBuffer(buffer)
 			if len(toolCalls) > 0 {
diff --git a/plugins/wasm-go/extensions/ai-statistics/main_test.go b/plugins/wasm-go/extensions/ai-statistics/main_test.go
index 2e6329ae6..4af76e686 100644
--- a/plugins/wasm-go/extensions/ai-statistics/main_test.go
+++ b/plugins/wasm-go/extensions/ai-statistics/main_test.go
@@ -1712,3 +1712,305 @@ func TestTokenDetails(t *testing.T) {
 		host.CompleteHttp()
 	})
 }
+
+func TestUnmatchedPathsAndContentTypes(t *testing.T) {
+	test.RunTest(t, func(t *testing.T) {
+		restrictiveConfig := func() json.RawMessage {
+			data, _ := json.Marshal(map[string]interface{}{
+				"enable_path_suffixes": []string{"/allowed_path"},
+				"enable_content_types": []string{"application/json"},
+				"attributes": []map[string]interface{}{
+					{
+						"key":          "test_attr",
+						"value_source": "response_body",
+						"value":        "data",
+						"apply_to_log": true,
+					},
+				},
+				"disable_openai_usage": true,
+			})
+			return data
+		}()
+
+		t.Run("skip request for unenabled path", func(t *testing.T) {
+			host, status := test.NewTestHost(restrictiveConfig)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			action := host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/disallowed_path"},
+				{":method", "POST"},
+			})
+			require.Equal(t, types.ActionContinue, action)
+			host.CompleteHttp()
+		})
+
+		t.Run("skip response for unenabled content type", func(t *testing.T) {
+			host, status := test.NewTestHost(restrictiveConfig)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/allowed_path"},
+				{":method", "POST"},
+			})
+
+			action := host.CallOnHttpResponseHeaders([][2]string{
+				{":status", "200"},
+				{"content-type", "text/plain"},
+			})
+			require.Equal(t, types.ActionContinue, action)
+			host.CompleteHttp()
+		})
+	})
+}
+
+func TestSetSpanAttributeAndLoggingEdgeCases(t *testing.T) {
+	test.RunTest(t, func(t *testing.T) {
+		configBytes := []byte(`{
+			"attributes": [
+				{
+					"key": "test_attr1",
+					"value_source": "fixed_value",
+					"value": "",
+					"apply_to_span": true
+				},
+				{
+					"key": "test_attr2",
+					"value_source": "fixed_value",
+					"value": "long_value_that_exceeds_limit_long_value_that_exceeds_limit_long_value_that_exceeds_limit",
+					"apply_to_log": true
+				}
+			],
+			"value_length_limit": 20
+		}`)
+
+		t.Run("span attribute edge cases", func(t *testing.T) {
+			host, status := test.NewTestHost(configBytes)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			// Setting fixed value attribute to empty should just print a debug log and skip setting span
+			action := host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/api/chat"},
+			})
+			require.Equal(t, types.ActionContinue, action)
+			host.CompleteHttp()
+		})
+	})
+}
+
+func TestGetRouteAndClusterNameEdgeCases(t *testing.T) {
+	test.RunTest(t, func(t *testing.T) {
+		t.Run("properties absence", func(t *testing.T) {
+			host, status := test.NewTestHost([]byte(`{}`))
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			// Host doesn't have route_name implicitly by default without SetRouteName, but getRouteName handles err
+			host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/api/chat"},
+			})
+			host.CompleteHttp()
+		})
+
+		t.Run("api name with @", func(t *testing.T) {
+			host, status := test.NewTestHost([]byte(`{}`))
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			host.SetRouteName("api@v1@service@extra") // @ has special handling in getAPIName
+			host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/api/chat"},
+			})
+			host.CompleteHttp()
+		})
+	})
+}
+
+func TestExtractClaudeStreamingToolCallsMissingInput(t *testing.T) {
+	t.Run("claude missing partial_json", func(t *testing.T) {
+		chunks := [][]byte{
+			[]byte(`data: {"type":"content_block_start","index":0,"content_block":{"type":"tool_use","id":"tool_123","name":"get_weather","input":{}}}`),
+			[]byte(`data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta"}}`),
+			[]byte(`data: {"type":"content_block_stop","index":0}`),
+		}
+
+		var buffer *StreamingToolCallsBuffer
+		for _, chunk := range chunks {
+			buffer = extractClaudeStreamingToolCalls(chunk, buffer)
+		}
+
+		toolCalls := getToolCallsFromBuffer(buffer)
+		require.Len(t, toolCalls, 1)
+		require.Equal(t, "tool_123", toolCalls[0].ID)
+		require.Equal(t, "tool_use", toolCalls[0].Type)
+		require.Equal(t, "get_weather", toolCalls[0].Function.Name)
+		// partial_json absence means arguments might be empty
+	})
+}
+
+func TestWriteMetricEdgeCases(t *testing.T) {
+	test.RunTest(t, func(t *testing.T) {
+		t.Run("disable_openai_usage true", func(t *testing.T) {
+			configBytes := []byte(`{
+				"disable_openai_usage": true
+			}`)
+			host, status := test.NewTestHost(configBytes)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+
+			host.SetRouteName("api-v1")
+			host.SetClusterName("cluster-1")
+
+			host.CallOnHttpRequestHeaders([][2]string{
+				{":authority", "example.com"},
+				{":path", "/api/chat"},
+			})
+
+			host.CallOnHttpResponseHeaders([][2]string{
+				{":status", "200"},
+				{"content-type", "application/json"},
+			})
+
+			responseBody := []byte(`{
+				"usage": {"prompt_tokens": 5, "completion_tokens": 8, "total_tokens": 13},
+				"model": "gpt-3.5-turbo"
+			}`)
+			host.CallOnHttpResponseBody(responseBody)
+			host.CompleteHttp()
+		})
+	})
+}
+
+func TestIsPathEnabled(t *testing.T) {
+	require.True(t, isPathEnabled("/v1/chat/completions", nil))
+	require.True(t, isPathEnabled("/v1/chat/completions", []string{}))
+	require.True(t, isPathEnabled("/v1/chat/completions", []string{"/completions", "/messages"}))
+	require.True(t, isPathEnabled("/v1/messages", []string{"/completions", "/messages"}))
+	require.False(t, isPathEnabled("/v1/embeddings", []string{"/completions", "/messages"}))
+
+	// test query params
+	require.True(t, isPathEnabled("/v1/chat/completions?stream=true", []string{"/completions"}))
+	require.False(t, isPathEnabled("/v1/embeddings?stream=true", []string{"/completions"}))
+}
+
+func TestIsContentTypeEnabled(t *testing.T) {
+	require.True(t, isContentTypeEnabled("application/json", nil))
+	require.True(t, isContentTypeEnabled("application/json", []string{}))
+	require.True(t, isContentTypeEnabled("application/json", []string{"application/json", "text/event-stream"}))
+	require.True(t, isContentTypeEnabled("text/event-stream; charset=utf-8", []string{"application/json", "text/event-stream"}))
+	require.False(t, isContentTypeEnabled("text/html", []string{"application/json", "text/event-stream"}))
+}
+
+func TestConvertToUInt(t *testing.T) {
+	val, ok := convertToUInt(int32(10))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	val, ok = convertToUInt(int64(10))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	val, ok = convertToUInt(uint32(10))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	val, ok = convertToUInt(uint64(10))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	val, ok = convertToUInt(float32(10.0))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	val, ok = convertToUInt(float64(10.0))
+	require.True(t, ok)
+	require.Equal(t, uint64(10), val)
+
+	_, ok = convertToUInt("10")
+	require.False(t, ok)
+}
+
+func TestExtractClaudeStreamingToolCalls(t *testing.T) {
+	t.Run("claude tool use assembly", func(t *testing.T) {
+		chunks := [][]byte{
+			[]byte(`data: {"type":"content_block_start","index":0,"content_block":{"type":"tool_use","id":"tool_123","name":"get_weather"}}`),
+			[]byte(`data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"{\"loc"}}}`),
+			[]byte(`data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"ation\":\"Bei"}}}`),
+			[]byte(`data: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"jing\"}"}}}`),
+			[]byte(`data: {"type":"content_block_stop","index":0}`),
+		}
+
+		var buffer *StreamingToolCallsBuffer
+		for _, chunk := range chunks {
+			buffer = extractClaudeStreamingToolCalls(chunk, buffer)
+		}
+
+		toolCalls := getToolCallsFromBuffer(buffer)
+		require.Len(t, toolCalls, 1)
+		require.Equal(t, "tool_123", toolCalls[0].ID)
+		require.Equal(t, "tool_use", toolCalls[0].Type)
+		require.Equal(t, "get_weather", toolCalls[0].Function.Name)
+		require.Equal(t, `{"location":"Beijing"}`, toolCalls[0].Function.Arguments)
+	})
+
+	t.Run("claude empty chunks", func(t *testing.T) {
+		chunks := [][]byte{
+			[]byte(`data: {"type":"ping"}`),
+			[]byte(`data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello"}}`),
+		}
+		var buffer *StreamingToolCallsBuffer
+		for _, chunk := range chunks {
+			buffer = extractClaudeStreamingToolCalls(chunk, buffer)
+		}
+		toolCalls := getToolCallsFromBuffer(buffer)
+		require.Len(t, toolCalls, 0)
+	})
+
+	t.Run("claude tool use with initial input", func(t *testing.T) {
+		chunks := [][]byte{
+			[]byte(`data: {"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"tool_456","name":"get_time","input":{"timezone":"UTC+8"}}}`),
+			[]byte(`data: {"type":"content_block_stop","index":1}`),
+		}
+
+		var buffer *StreamingToolCallsBuffer
+		for _, chunk := range chunks {
+			buffer = extractClaudeStreamingToolCalls(chunk, buffer)
+		}
+
+		toolCalls := getToolCallsFromBuffer(buffer)
+		require.Len(t, toolCalls, 1)
+		require.Equal(t, "tool_456", toolCalls[0].ID)
+		require.Equal(t, "tool_use", toolCalls[0].Type)
+		require.Equal(t, "get_time", toolCalls[0].Function.Name)
+		require.Equal(t, `{"timezone":"UTC+8"}`, toolCalls[0].Function.Arguments)
+	})
+}
+
+func TestConfigWithDefaultAttributes(t *testing.T) {
+	test.RunTest(t, func(t *testing.T) {
+		t.Run("use default attributes config", func(t *testing.T) {
+			defaultConfig := []byte(`{
+				"use_default_attributes": true
+			}`)
+			host, status := test.NewTestHost(defaultConfig)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+		})
+
+		t.Run("use default response attributes config", func(t *testing.T) {
+			defaultRespConfig := []byte(`{
+				"use_default_response_attributes": true
+			}`)
+			host, status := test.NewTestHost(defaultRespConfig)
+			defer host.Reset()
+			require.Equal(t, types.OnPluginStartStatusOK, status)
+		})
+	})
+}