🐛 fix(mcp): 修复执行SQL结果不可见

- execute_sql 文本 Content 输出可读的 SQL 执行摘要和 Markdown 结果表\n- 保留 structuredContent 结构化结果，兼容机器解析客户端\n- 新增 in-memory MCP 调用回归测试，覆盖 select 1 可见结果

internal/mcpserver/server_test.go

@@ -2,8 +2,13 @@ package mcpserver
 
 import (
 	"context"
+	"encoding/json"
+	"strings"
 	"testing"
 
+	"GoNavi-Wails/internal/ai"
+	appcore "GoNavi-Wails/internal/app"
+	"GoNavi-Wails/internal/connection"
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 )
 
@@ -23,6 +28,63 @@ func TestNewServerIncludesExecuteSQLByDefault(t *testing.T) {
 	assertToolPresent(t, toolNames, "execute_sql")
 }
 
+func TestExecuteSQLCallToolReturnsSelectResultContent(t *testing.T) {
+	backend := &fakeBackend{
+		editableConnection: connection.SavedConnectionView{
+			ID: "mysql-main",
+			Config: connection.ConnectionConfig{
+				Type:     "mysql",
+				Database: "app",
+			},
+		},
+		inspection: appcore.SQLInspection{
+			StatementCount: 1,
+			ReadOnly:       true,
+			Statements: []appcore.SQLStatementInspection{
+				{Index: 1, Keyword: "select", ReadOnly: true},
+			},
+		},
+		safetyLevel: ai.PermissionReadOnly,
+		queryResult: connection.QueryResult{
+			Success: true,
+			QueryID: "query-select-1",
+			Data: []connection.ResultSetData{
+				{
+					StatementIndex: 1,
+					Columns:        []string{"1"},
+					Rows:           []map[string]interface{}{{"1": 1}},
+				},
+			},
+		},
+	}
+
+	result := callServerTool(t, NewServer(backend), "execute_sql", map[string]any{
+		"connectionId": "mysql-main",
+		"sql":          "select 1",
+	})
+
+	if result.IsError {
+		t.Fatalf("expected execute_sql success, got error content: %#v", result.Content)
+	}
+	text := firstTextContent(result)
+	if strings.TrimSpace(text) == "" {
+		t.Fatalf("expected execute_sql to return text content for MCP clients, got %#v", result.Content)
+	}
+	if !strings.Contains(text, "SQL 执行成功") || !strings.Contains(text, "结果集 1") {
+		t.Fatalf("expected readable SQL result summary, got %s", text)
+	}
+	if !strings.Contains(text, "| 1 |") || !strings.Contains(text, "| --- |") {
+		t.Fatalf("expected select result table in MCP text content, got %s", text)
+	}
+	structured, err := json.Marshal(result.StructuredContent)
+	if err != nil {
+		t.Fatalf("failed to marshal structuredContent: %v", err)
+	}
+	if !strings.Contains(string(structured), `"results"`) || !strings.Contains(string(structured), `"rows"`) {
+		t.Fatalf("expected structuredContent to retain SQL result JSON, got %s", string(structured))
+	}
+}
+
 func listServerToolNames(t *testing.T, server *mcp.Server) map[string]bool {
 	t.Helper()
 
@@ -53,6 +115,38 @@ func listServerToolNames(t *testing.T, server *mcp.Server) map[string]bool {
 	return names
 }
 
+func callServerTool(t *testing.T, server *mcp.Server, name string, args map[string]any) *mcp.CallToolResult {
+	t.Helper()
+
+	ctx := context.Background()
+	clientTransport, serverTransport := mcp.NewInMemoryTransports()
+	serverSession, err := server.Connect(ctx, serverTransport, nil)
+	if err != nil {
+		t.Fatalf("server.Connect returned error: %v", err)
+	}
+	defer serverSession.Close()
+
+	client := mcp.NewClient(&mcp.Implementation{Name: "test-client", Version: "v0.0.1"}, nil)
+	clientSession, err := client.Connect(ctx, clientTransport, nil)
+	if err != nil {
+		t.Fatalf("client.Connect returned error: %v", err)
+	}
+	defer clientSession.Close()
+
+	payload, err := json.Marshal(args)
+	if err != nil {
+		t.Fatalf("json.Marshal returned error: %v", err)
+	}
+	result, err := clientSession.CallTool(ctx, &mcp.CallToolParams{
+		Name:      name,
+		Arguments: json.RawMessage(payload),
+	})
+	if err != nil {
+		t.Fatalf("CallTool returned error: %v", err)
+	}
+	return result
+}
+
 func assertToolPresent(t *testing.T, names map[string]bool, name string) {
 	t.Helper()
 	if !names[name] {

internal/mcpserver/service.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/url"
+	"sort"
 	"strings"
 
 	"GoNavi-Wails/internal/ai"
@@ -555,7 +556,7 @@ func (s *Service) ExecuteSQL(ctx context.Context, req *mcp.CallToolRequest, args
 	}
 
 	normalizedResults, truncated := normalizeResultSets(resultSets, normalizeMaxRowsPerResult(args.MaxRowsPerResult))
-	return successResult(), executeSQLResult{
+	output := executeSQLResult{
 		ConnectionID:   view.ID,
 		DBName:         dbName,
 		StatementCount: inspection.StatementCount,
@@ -565,13 +566,22 @@ func (s *Service) ExecuteSQL(ctx context.Context, req *mcp.CallToolRequest, args
 		Truncated:      truncated,
 		Statements:     toStatementSummaries(inspection.Statements),
 		Results:        normalizedResults,
-	}, nil
+	}
+	return textResult(formatExecuteSQLResultContent(output)), output, nil
 }
 
 func successResult() *mcp.CallToolResult {
 	return &mcp.CallToolResult{}
 }
 
+func textResult(text string) *mcp.CallToolResult {
+	return &mcp.CallToolResult{
+		Content: []mcp.Content{
+			&mcp.TextContent{Text: text},
+		},
+	}
+}
+
 func toolError(format string, args ...interface{}) *mcp.CallToolResult {
 	return &mcp.CallToolResult{
 		IsError: true,
@@ -922,6 +932,128 @@ func normalizeResultSets(resultSets []connection.ResultSetData, maxRows int) ([]
 	return normalized, truncatedAny
 }
 
+func formatExecuteSQLResultContent(result executeSQLResult) string {
+	var builder strings.Builder
+	builder.WriteString("SQL 执行成功")
+	if result.QueryID != "" {
+		builder.WriteString("，queryId=")
+		builder.WriteString(result.QueryID)
+	}
+	builder.WriteString("\n")
+	builder.WriteString(fmt.Sprintf("语句数：%d，结果集：%d", result.StatementCount, len(result.Results)))
+	if result.Truncated {
+		builder.WriteString("，结果已截断")
+	}
+	if result.Message != "" {
+		builder.WriteString("\n消息：")
+		builder.WriteString(result.Message)
+	}
+	if len(result.Results) == 0 {
+		builder.WriteString("\n无结果集返回。")
+		return builder.String()
+	}
+
+	for index, resultSet := range result.Results {
+		builder.WriteString("\n\n")
+		builder.WriteString(fmt.Sprintf("结果集 %d", index+1))
+		if resultSet.StatementIndex > 0 {
+			builder.WriteString(fmt.Sprintf("（语句 #%d）", resultSet.StatementIndex))
+		}
+		builder.WriteString(fmt.Sprintf("：%d 行", resultSet.RowCount))
+		if resultSet.Truncated {
+			builder.WriteString(fmt.Sprintf("，仅显示前 %d 行", len(resultSet.Rows)))
+		}
+		if len(resultSet.Messages) > 0 {
+			builder.WriteString("\n消息：")
+			builder.WriteString(strings.Join(resultSet.Messages, "\n"))
+		}
+		if len(resultSet.Columns) == 0 {
+			if len(resultSet.Rows) == 0 {
+				builder.WriteString("\n无列/行数据。")
+				continue
+			}
+			resultSet.Columns = inferColumnsFromRows(resultSet.Rows)
+		}
+		if len(resultSet.Columns) == 0 {
+			continue
+		}
+		builder.WriteString("\n")
+		builder.WriteString(formatMarkdownTable(resultSet.Columns, resultSet.Rows))
+	}
+	return builder.String()
+}
+
+func inferColumnsFromRows(rows []map[string]interface{}) []string {
+	seen := make(map[string]struct{})
+	columns := []string{}
+	for _, row := range rows {
+		keys := make([]string, 0, len(row))
+		for key := range row {
+			if _, ok := seen[key]; ok {
+				continue
+			}
+			keys = append(keys, key)
+		}
+		sort.Strings(keys)
+		for _, key := range keys {
+			seen[key] = struct{}{}
+			columns = append(columns, key)
+		}
+	}
+	return columns
+}
+
+func formatMarkdownTable(columns []string, rows []map[string]interface{}) string {
+	var builder strings.Builder
+	builder.WriteString("|")
+	for _, column := range columns {
+		builder.WriteString(" ")
+		builder.WriteString(escapeMarkdownTableCell(column))
+		builder.WriteString(" |")
+	}
+	builder.WriteString("\n|")
+	for range columns {
+		builder.WriteString(" --- |")
+	}
+	for _, row := range rows {
+		builder.WriteString("\n|")
+		for _, column := range columns {
+			builder.WriteString(" ")
+			builder.WriteString(escapeMarkdownTableCell(formatSQLValue(row[column])))
+			builder.WriteString(" |")
+		}
+	}
+	return builder.String()
+}
+
+func formatSQLValue(value interface{}) string {
+	if value == nil {
+		return "NULL"
+	}
+	switch typed := value.(type) {
+	case string:
+		return typed
+	case []byte:
+		return string(typed)
+	case fmt.Stringer:
+		return typed.String()
+	}
+	data, err := json.Marshal(value)
+	if err == nil {
+		return string(data)
+	}
+	return fmt.Sprint(value)
+}
+
+func escapeMarkdownTableCell(value string) string {
+	value = strings.ReplaceAll(value, "\\", "\\\\")
+	value = strings.ReplaceAll(value, "|", "\\|")
+	value = strings.ReplaceAll(value, "\r\n", "\n")
+	value = strings.ReplaceAll(value, "\r", "\n")
+	value = strings.ReplaceAll(value, "\n", "<br>")
+	return value
+}
+
 func toStatementSummaries(items []appcore.SQLStatementInspection) []sqlStatementSummary {
 	result := make([]sqlStatementSummary, 0, len(items))
 	for _, item := range items {