1 files changed, 25 insertions, 11 deletions
diff --git a/internal/llm/provider.go b/internal/llm/provider.go
index fd9d4d3..a80b1c1 100644
--- a/internal/llm/provider.go
+++ b/internal/llm/provider.go
@@ -1,10 +1,10 @@
 package llm
 
 import (
-	"context"
-	"errors"
-	"log"
-	"os"
+    "context"
+    "errors"
+    "log"
+    "os"
 )
 
 // Message represents a chat-style prompt message.
@@ -16,8 +16,8 @@ type Message struct {
 // Client is a minimal LLM provider interface.
 // Future providers (Ollama, etc.) should implement this.
 type Client interface {
-	// Chat sends chat messages and returns the assistant text.
-	Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error)
+    // Chat sends chat messages and returns the assistant text.
+    Chat(ctx context.Context, messages []Message, opts ...RequestOption) (string, error)
 }
 
 // Options for a request. Providers may ignore unsupported fields.
@@ -41,9 +41,23 @@ func WithStop(stop ...string) RequestOption {
 // NewDefault returns the default provider using environment configuration.
 // Currently this is the OpenAI provider using OPENAI_API_KEY.
 func NewDefault(logger *log.Logger) (Client, error) {
-	apiKey := os.Getenv("OPENAI_API_KEY")
-	if apiKey == "" {
-		return nil, errors.New("OPENAI_API_KEY is not set")
-	}
-	return newOpenAIFromEnv(apiKey, logger), nil
+    apiKey := os.Getenv("OPENAI_API_KEY")
+    if apiKey == "" {
+        return nil, errors.New("OPENAI_API_KEY is not set")
+    }
+    return newOpenAIFromEnv(apiKey, logger), nil
+}
+
+// Logging configuration for previews
+var logPreviewLimit int // 0 means unlimited
+
+// SetLogPreviewLimit sets the maximum number of characters to log for
+// request/response previews. Set to 0 for unlimited.
+func SetLogPreviewLimit(n int) { logPreviewLimit = n }
+
+func previewForLog(s string) string {
+    if logPreviewLimit > 0 {
+        return trimPreview(s, logPreviewLimit)
+    }
+    return s
 }