feat: send version in User-Agent header and MCP clientInfo (#12)

Pass the build-time Version to the MCP client so it is included
in the User-Agent header and the initialize handshake clientInfo.

Author: nictuku

cmd/debug.go

@@ -248,7 +248,7 @@ func newGoogleAdsMCPClient() (*client.Client, error) {
 	if err != nil {
 		return nil, err
 	}
-	c := client.New(apiURL, token)
+	c := client.New(apiURL, token, Version)
 	fmt.Fprintf(os.Stderr, "Connecting to %s/%s...\n", apiURL, googleAdsMCPServer)
 	if err := c.Initialize(googleAdsMCPServer); err != nil {
 		return nil, fmt.Errorf("MCP handshake failed: %w", err)

cmd/dynamic.go

@@ -195,7 +195,7 @@ func runDynamicTool(server ServerConfig, toolName string, schema InputSchema, st
 		return err
 	}
 
-	c := client.New(apiURL, token)
+	c := client.New(apiURL, token, Version)
 
 	fmt.Fprintf(os.Stderr, "Connecting to %s/%s...\n", apiURL, server.Path)
 	if err := c.Initialize(server.Path); err != nil {

cmd/mcp.go

@@ -61,7 +61,7 @@ func newMCPClient() (*client.Client, error) {
 	if err != nil {
 		return nil, err
 	}
-	return client.New(apiURL, token), nil
+	return client.New(apiURL, token, Version), nil
 }
 
 func runMCPToolsList(cmd *cobra.Command, args []string) error {

cmd/refresh.go

@@ -55,7 +55,7 @@ func runRefresh(cmd *cobra.Command, args []string) error {
 // fetchAndCacheTools fetches tools from all servers and saves the cache.
 // If verbose is true, progress is printed to stderr.
 func fetchAndCacheTools(baseURL, token string, verbose bool) (*ToolsCache, error) {
-	c := client.New(baseURL, token)
+	c := client.New(baseURL, token, Version)
 	cache := &ToolsCache{
 		Servers:       make(map[string]ServerToolsCache),
 		UpdatedAt:     time.Now(),

internal/client/mcp.go

@@ -14,15 +14,20 @@ import (
 type Client struct {
 	baseURL    string
 	token      string
+	version    string
+	userAgent  string
 	httpClient *http.Client
 	reqID      atomic.Int64
 }
 
-// New creates an MCP client.
-func New(baseURL, token string) *Client {
+// New creates an MCP client. version is used in the User-Agent header
+// and the MCP clientInfo.
+func New(baseURL, token, version string) *Client {
 	return &Client{
 		baseURL:    baseURL,
 		token:      token,
+		version:    version,
+		userAgent:  "pipeboard-cli/" + version,
 		httpClient: &http.Client{},
 	}
 }
@@ -71,7 +76,7 @@ func (c *Client) Initialize(serverPath string) error {
 		"capabilities":    map[string]interface{}{},
 		"clientInfo": map[string]string{
 			"name":    "pipeboard-cli",
-			"version": "0.1.0",
+			"version": c.version,
 		},
 	}
 
@@ -137,6 +142,7 @@ func (c *Client) call(serverPath, method string, params interface{}) (json.RawMe
 
 	httpReq.Header.Set("Content-Type", "application/json")
 	httpReq.Header.Set("Authorization", "Bearer "+c.token)
+	httpReq.Header.Set("User-Agent", c.userAgent)
 
 	resp, err := c.httpClient.Do(httpReq)
 	if err != nil {
@@ -218,6 +224,7 @@ func (c *Client) notify(serverPath, method string, params interface{}) error {
 
 	httpReq.Header.Set("Content-Type", "application/json")
 	httpReq.Header.Set("Authorization", "Bearer "+c.token)
+	httpReq.Header.Set("User-Agent", c.userAgent)
 
 	resp, err := c.httpClient.Do(httpReq)
 	if err != nil {