fix(llm): send whip user agent

internal/llm/openai.go

@@ -349,6 +349,16 @@ func New(baseURL, apiKey string) *Client {
 	}
 }
 
+const userAgent = "whip"
+
+func (c *Client) setProviderHeaders(req *http.Request, contentType bool) {
+	if contentType {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	req.Header.Set("Authorization", "Bearer "+c.APIKey)
+	req.Header.Set("User-Agent", userAgent)
+}
+
 // Request is a chat completions request.
 type Request struct {
 	Model           string    `json:"model"`
@@ -600,7 +610,7 @@ func (c *Client) Models(ctx context.Context) ([]ModelInfo, error) {
 	if err != nil {
 		return nil, err
 	}
-	hr.Header.Set("Authorization", "Bearer "+c.APIKey)
+	c.setProviderHeaders(hr, false)
 	resp, err := c.HTTP.Do(hr)
 	if err != nil {
 		return nil, err
@@ -683,8 +693,7 @@ func (c *Client) streamOnce(ctx context.Context, body []byte, onText, onThink fu
 	if err != nil {
 		return Message{}, Usage{}, err
 	}
-	hr.Header.Set("Content-Type", "application/json")
-	hr.Header.Set("Authorization", "Bearer "+c.APIKey)
+	c.setProviderHeaders(hr, true)
 	resp, err := c.HTTP.Do(hr)
 	if err != nil {
 		return Message{}, Usage{}, err
@@ -814,8 +823,7 @@ func (c *Client) completeOnce(ctx context.Context, body []byte) (string, Usage,
 	if err != nil {
 		return "", Usage{}, err
 	}
-	hr.Header.Set("Content-Type", "application/json")
-	hr.Header.Set("Authorization", "Bearer "+c.APIKey)
+	c.setProviderHeaders(hr, true)
 	resp, err := c.HTTP.Do(hr)
 	if err != nil {
 		return "", Usage{}, err

internal/llm/user_agent_test.go

@@ -0,0 +1,72 @@
+package llm
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestClientSendsWhipUserAgent(t *testing.T) {
+	tests := []struct {
+		name string
+		run  func(*Client) error
+	}{
+		{
+			name: "models",
+			run: func(c *Client) error {
+				_, err := c.Models(context.Background())
+				return err
+			},
+		},
+		{
+			name: "stream",
+			run: func(c *Client) error {
+				_, _, err := c.Stream(context.Background(), Request{Model: "m", Messages: []Message{{Role: "user", Content: "hi"}}}, nil, nil, nil)
+				return err
+			},
+		},
+		{
+			name: "complete",
+			run: func(c *Client) error {
+				_, _, err := c.Complete(context.Background(), Request{Model: "m", Messages: []Message{{Role: "user", Content: "hi"}}})
+				return err
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var gotUserAgent string
+			srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				gotUserAgent = r.Header.Get("User-Agent")
+				switch r.URL.Path {
+				case "/models":
+					w.Header().Set("Content-Type", "application/json")
+					_, _ = w.Write([]byte(`{"data":[]}`))
+				case "/chat/completions":
+					if r.Header.Get("Content-Type") != "application/json" {
+						t.Fatalf("Content-Type = %q, want application/json", r.Header.Get("Content-Type"))
+					}
+					w.Header().Set("Content-Type", "text/event-stream")
+					if tt.name == "complete" {
+						_, _ = w.Write([]byte(`{"choices":[{"message":{"content":"ok"}}]}`))
+						return
+					}
+					_, _ = w.Write([]byte("data: {\"choices\":[{\"delta\":{\"content\":\"ok\"}}]}\n\ndata: [DONE]\n\n"))
+				default:
+					t.Fatalf("unexpected path %s", r.URL.Path)
+				}
+			}))
+			defer srv.Close()
+
+			c := New(srv.URL, "k")
+			if err := tt.run(c); err != nil {
+				t.Fatal(err)
+			}
+			if gotUserAgent != "whip" {
+				t.Fatalf("User-Agent = %q, want whip", gotUserAgent)
+			}
+		})
+	}
+}