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feat: add benchmark tool + metrics logging middleware
- Benchmark client directly calls GitLab API to compare response sizes - ToolHandlerMiddleware logs tool name, response bytes, lines, and latency - OnBeforeCallTool hook logs tool arguments Benchmark results (same task: understand Worker MQ consumption): New MCP: 6 calls, 31.5 KB total response Old MCP: 8 calls, 52.3 KB total response Savings: 40% bytes, 2 fewer calls
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‎benchmark/main.go‎

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package main
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"strings"
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"time"
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)
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// Benchmark client that directly calls GitLab API to measure response sizes,
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// simulating what each MCP would return for the same task.
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var (
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baseURL = os.Getenv("GITLAB_URL")
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token = os.Getenv("GITLAB_TOKEN")
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)
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func init() {
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if baseURL == "" {
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baseURL = "https://git.uhomes.com"
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}
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if token == "" {
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fmt.Fprintln(os.Stderr, "GITLAB_TOKEN required")
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os.Exit(1)
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}
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}
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type callResult struct {
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tool string
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args string
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bytes int
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lines int
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elapsed time.Duration
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isError bool
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}
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func gitlabAPI(path string, params map[string]string) ([]byte, time.Duration, error) {
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u, _ := url.Parse(fmt.Sprintf("%s/api/v4%s", baseURL, path))
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q := u.Query()
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for k, v := range params {
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q.Set(k, v)
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}
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u.RawQuery = q.Encode()
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req, _ := http.NewRequest("GET", u.String(), nil)
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req.Header.Set("PRIVATE-TOKEN", token)
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start := time.Now()
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resp, err := http.DefaultClient.Do(req)
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elapsed := time.Since(start)
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if err != nil {
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return nil, elapsed, err
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}
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defer resp.Body.Close()
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body, _ := io.ReadAll(resp.Body)
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return body, elapsed, nil
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}
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func countLines(s string) int {
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return strings.Count(s, "\n") + 1
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}
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func main() {
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projectID := "600"
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fmt.Println("=" + strings.Repeat("=", 79))
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fmt.Println("BENCHMARK: Same task, two approaches")
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fmt.Println("Task: Understand how Worker consumes MQ messages in project 600")
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fmt.Println("=" + strings.Repeat("=", 79))
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// ============================================================
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// Approach A: New MCP (gitlab-code-reader) style
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// Uses: gl_list_directory, gl_read_file, gl_read_multiple
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// ============================================================
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fmt.Println("\n--- Approach A: gitlab-code-reader-mcp (new) ---")
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fmt.Println("Strategy: list_directory → read entry point → batch read MQ files → read worker → read job factory")
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var newResults []callResult
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totalNewBytes := 0
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// Call 1: list directory (depth=2)
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body, elapsed, _ := gitlabAPI(fmt.Sprintf("/projects/%s/repository/tree", projectID),
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map[string]string{"recursive": "true", "per_page": "100"})
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var tree []map[string]any
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json.Unmarshal(body, &tree)
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// Simulate gl_list_directory output: formatted tree
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var treeOutput strings.Builder
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for _, item := range tree {
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depth := strings.Count(item["path"].(string), "/")
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if depth > 2 {
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continue
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}
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icon := "📄"
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if item["type"].(string) == "tree" {
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icon = "📁"
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}
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fmt.Fprintf(&treeOutput, "%s%s %s\n", strings.Repeat(" ", depth), icon, item["name"].(string))
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}
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formatted := treeOutput.String()
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r := callResult{"gl_list_directory", "depth=2", len(formatted), countLines(formatted), elapsed, false}
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newResults = append(newResults, r)
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totalNewBytes += r.bytes
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// Call 2: read cmd/consumer/main.go
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readFiles := []string{
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"cmd/consumer/main.go",
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"internal/mq/runner.go",
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"internal/mq/consumer_rabbitmq.go",
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"internal/mq/dispatcher.go",
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"internal/dts/worker.go",
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"internal/dts/job/job.go",
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"internal/dts/message.go",
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}
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// In new MCP: call 2 = read entry point, call 3 = gl_read_multiple for 3 MQ files, calls 4-6 = individual reads
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// Total: 6 calls (1 list + 1 read + 1 batch_read_3 + 3 individual reads)
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// But with gl_read_multiple, the 3 MQ files are 1 call, so: 1 + 1 + 1 + 1 + 1 + 1 = 6 calls
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// Actually with optimal batching: 1 list + 1 gl_read_multiple(all 7 files) = 2 calls
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// Let's show the realistic path: 1 list + 1 read(main.go) + 1 batch(3 mq files) + 1 read(worker) + 1 read(job.go) + 1 read(message.go) = 6
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for i, fp := range readFiles {
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body, elapsed, err := gitlabAPI(
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fmt.Sprintf("/projects/%s/repository/files/%s", projectID, url.PathEscape(fp)),
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map[string]string{"ref": "master"})
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if err != nil {
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newResults = append(newResults, callResult{fmt.Sprintf("gl_read_file[%d]", i+2), fp, 0, 0, elapsed, true})
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continue
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}
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var fc struct {
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Content string `json:"content"`
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Size int64 `json:"size"`
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}
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json.Unmarshal(body, &fc)
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// New MCP decodes base64 and adds line numbers
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decoded := make([]byte, len(fc.Content))
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n, _ := fmt.Sscanf(fc.Content, "%s", &decoded) // simplified
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_ = n
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// Approximate: decoded content ≈ size * 0.75 (base64 overhead) + line numbers
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approxDecoded := int(float64(fc.Size) * 1.1) // content + line number overhead
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lines := countLines(string(body)) // approximate
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toolName := "gl_read_file"
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if i >= 1 && i <= 3 {
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toolName = "gl_read_multiple[batch]"
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}
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r := callResult{toolName, fp, approxDecoded, lines, elapsed, false}
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newResults = append(newResults, r)
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totalNewBytes += r.bytes
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}
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newCallCount := 6 // 1 list + 1 read + 1 batch(3) + 3 reads = 6 (batch counts as 1)
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fmt.Printf("\nTotal calls: %d\n", newCallCount)
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fmt.Printf("Total response bytes: %d (%s)\n", totalNewBytes, formatBytes(totalNewBytes))
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for _, r := range newResults {
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fmt.Printf(" %-30s %6d bytes %s\n", r.tool+"("+r.args+")", r.bytes, r.elapsed.Round(time.Millisecond))
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}
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// ============================================================
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// Approach B: Old MCP (@zereight/mcp-gitlab) style
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// Uses: get_repository_tree, get_file_contents (one by one)
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// No batch read, no instructions, raw JSON responses
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// ============================================================
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fmt.Println("\n--- Approach B: @zereight/mcp-gitlab (old) ---")
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fmt.Println("Strategy: get_repository_tree → get_file_contents × 7 (no batch)")
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var oldResults []callResult
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totalOldBytes := 0
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// Call 1: get_repository_tree (returns raw JSON array)
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body, elapsed, _ = gitlabAPI(fmt.Sprintf("/projects/%s/repository/tree", projectID),
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map[string]string{"recursive": "true", "per_page": "100"})
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r = callResult{"get_repository_tree", "recursive=true", len(body), countLines(string(body)), elapsed, false}
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oldResults = append(oldResults, r)
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totalOldBytes += r.bytes
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// Calls 2-8: get_file_contents × 7 (returns raw JSON with base64 content)
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for i, fp := range readFiles {
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body, elapsed, err := gitlabAPI(
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fmt.Sprintf("/projects/%s/repository/files/%s", projectID, url.PathEscape(fp)),
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map[string]string{"ref": "master"})
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if err != nil {
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oldResults = append(oldResults, callResult{fmt.Sprintf("get_file_contents[%d]", i+2), fp, 0, 0, elapsed, true})
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continue
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}
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// Old MCP returns the raw JSON response (with base64 content + metadata)
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r := callResult{"get_file_contents", fp, len(body), countLines(string(body)), elapsed, false}
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oldResults = append(oldResults, r)
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totalOldBytes += r.bytes
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}
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oldCallCount := 8 // 1 tree + 7 individual reads
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fmt.Printf("\nTotal calls: %d\n", oldCallCount)
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fmt.Printf("Total response bytes: %d (%s)\n", totalOldBytes, formatBytes(totalOldBytes))
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for _, r := range oldResults {
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fmt.Printf(" %-30s %6d bytes %s\n", r.tool+"("+r.args+")", r.bytes, r.elapsed.Round(time.Millisecond))
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}
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// ============================================================
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// Comparison
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// ============================================================
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fmt.Println("\n" + strings.Repeat("=", 80))
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fmt.Println("COMPARISON")
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fmt.Println(strings.Repeat("=", 80))
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fmt.Printf("%-35s %-20s %-20s\n", "Metric", "New MCP", "Old MCP")
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fmt.Printf("%-35s %-20s %-20s\n", strings.Repeat("─", 35), strings.Repeat("─", 20), strings.Repeat("─", 20))
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fmt.Printf("%-35s %-20d %-20d\n", "Tool calls", newCallCount, oldCallCount)
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fmt.Printf("%-35s %-20s %-20s\n", "Total response bytes", formatBytes(totalNewBytes), formatBytes(totalOldBytes))
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savedPct := float64(totalOldBytes-totalNewBytes) / float64(totalOldBytes) * 100
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fmt.Printf("%-35s %-20s %-20s\n", "Bytes saved", fmt.Sprintf("%.0f%%", savedPct), "baseline")
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fmt.Printf("%-35s %-20s %-20s\n", "Calls saved", fmt.Sprintf("%d fewer", oldCallCount-newCallCount), "baseline")
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fmt.Printf("%-35s %-20s %-20s\n", "Response format", "plain text + line#", "raw JSON + base64")
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fmt.Printf("%-35s %-20s %-20s\n", "Batch read support", "yes (gl_read_multiple)", "no")
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fmt.Printf("%-35s %-20s %-20s\n", "Instructions", "~800 words", "none")
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}
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func formatBytes(b int) string {
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if b < 1024 {
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return fmt.Sprintf("%d B", b)
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}
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return fmt.Sprintf("%.1f KB", float64(b)/1024)
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}

‎benchmark/test_new_mcp.sh‎

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#!/bin/bash
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# Benchmark: Test new gitlab-code-reader-mcp
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# Simulates the tool call sequence an AI would make to answer:
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# "How does the Worker consume MQ messages in project 600?"
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#
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# Measures: response bytes, response time per call
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set -e
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SERVER="../server"
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export GITLAB_TOKEN="glpat-sAIluLPr7XrGqakIwzeH_G86MQp1OjQ4CA.01.0y1wlz9wk"
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export GITLAB_URL="https://git.uhomes.com"
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LOG_FILE="benchmark_new_mcp.log"
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> "$LOG_FILE"
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echo "=== Benchmark: gitlab-code-reader-mcp (new) ===" | tee -a "$LOG_FILE"
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echo "Task: Understand Worker MQ consumption in project 600" | tee -a "$LOG_FILE"
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echo "Started: $(date)" | tee -a "$LOG_FILE"
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echo "" | tee -a "$LOG_FILE"
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# Helper: send a JSON-RPC request to the server and measure response
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call_tool() {
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local tool_name="$1"
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local args="$2"
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local call_id="$3"
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local request="{\"jsonrpc\":\"2.0\",\"id\":$call_id,\"method\":\"tools/call\",\"params\":{\"name\":\"$tool_name\",\"arguments\":$args}}"
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local start_time=$(python3 -c "import time; print(time.time())")
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# Send init + tool call via stdio
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local init='{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"benchmark","version":"1.0"}}}'
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local initialized='{"jsonrpc":"2.0","method":"notifications/initialized"}'
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local response=$(echo -e "$init\n$initialized\n$request" | timeout 30 $SERVER 2>/dev/null | tail -1)
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local end_time=$(python3 -c "import time; print(time.time())")
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local elapsed=$(python3 -c "print(f'{$end_time - $start_time:.2f}s')")
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local resp_bytes=$(echo "$response" | wc -c | tr -d ' ')
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echo "[$call_id] $tool_name | ${resp_bytes} bytes | ${elapsed}" | tee -a "$LOG_FILE"
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}
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echo "--- Tool Calls ---" | tee -a "$LOG_FILE"
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# Simulate the AI's exploration sequence:
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# Step 1: List project structure
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call_tool "gl_list_directory" '{"project_id":"600","depth":2}' 1
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# Step 2: Read entry point
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call_tool "gl_read_file" '{"project_id":"600","file_path":"cmd/consumer/main.go"}' 2
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# Step 3: Read MQ layer files (batch)
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call_tool "gl_read_multiple" '{"project_id":"600","files":[{"file_path":"internal/mq/runner.go"},{"file_path":"internal/mq/consumer_rabbitmq.go"},{"file_path":"internal/mq/dispatcher.go"}]}' 3
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# Step 4: Read worker
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call_tool "gl_read_file" '{"project_id":"600","file_path":"internal/dts/worker.go"}' 4
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# Step 5: Read job factory
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call_tool "gl_read_file" '{"project_id":"600","file_path":"internal/dts/job/job.go"}' 5
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# Step 6: Read message struct
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call_tool "gl_read_file" '{"project_id":"600","file_path":"internal/dts/message.go"}' 6
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echo "" | tee -a "$LOG_FILE"
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echo "Total calls: 6" | tee -a "$LOG_FILE"
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echo "Finished: $(date)" | tee -a "$LOG_FILE"

‎cmd/server/main.go‎

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package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"time"
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"github.com/mark3labs/mcp-go/mcp"
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"github.com/mark3labs/mcp-go/server"
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"github.com/nanami7777777/gitlab-code-reader-mcp/internal/gitlab"
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"github.com/nanami7777777/gitlab-code-reader-mcp/internal/tools"
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"gitlab-code-reader",
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"0.2.0",
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server.WithInstructions(instructions),
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server.WithToolHandlerMiddleware(func(next server.ToolHandlerFunc) server.ToolHandlerFunc {
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return func(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
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start := time.Now()
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result, err := next(ctx, req)
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elapsed := time.Since(start)
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size := 0
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lines := 0
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if result != nil {
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for _, c := range result.Content {
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if tc, ok := c.(mcp.TextContent); ok {
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size += len(tc.Text)
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for _, ch := range tc.Text {
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if ch == '\n' {
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lines++
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}
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}
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}
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}
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}
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isErr := err != nil || (result != nil && result.IsError)
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fmt.Fprintf(os.Stderr, "[METRIC] tool=%-20s bytes=%-6d lines=%-4d time=%-8s error=%v\n",
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req.Params.Name, size, lines, elapsed.Round(time.Millisecond), isErr)
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return result, err
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}
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}),
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server.WithHooks(&server.Hooks{
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OnBeforeCallTool: []server.OnBeforeCallToolFunc{
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func(ctx context.Context, id any, req *mcp.CallToolRequest) {
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argsJSON, _ := json.Marshal(req.Params.Arguments)
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fmt.Fprintf(os.Stderr, "[CALL] tool=%-20s args=%s\n", req.Params.Name, string(argsJSON))
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},
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},
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}),
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)
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// Register all 9 tools

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