diff --git a/llm/gem/gem.go b/llm/gem/gem.go
index 1621f2d..358770c 100644
--- a/llm/gem/gem.go
+++ b/llm/gem/gem.go
@@ -23,10 +23,11 @@
 // Service provides Gemini completions.
 // Fields should not be altered concurrently with calling any method on Service.
 type Service struct {
-	HTTPC  *http.Client // defaults to http.DefaultClient if nil
-	URL    string       // Gemini API URL, uses the gemini package default if empty
-	APIKey string       // must be non-empty
-	Model  string       // defaults to DefaultModel if empty
+	HTTPC   *http.Client // defaults to http.DefaultClient if nil
+	URL     string       // Gemini API URL, uses the gemini package default if empty
+	APIKey  string       // must be non-empty
+	Model   string       // defaults to DefaultModel if empty
+	DumpLLM bool         // whether to dump request/response text to files for debugging; defaults to false
 }
 
 var _ llm.Service = (*Service)(nil)
@@ -513,6 +514,14 @@
 	// Log the structured Gemini request for debugging
 	if reqJSON, err := json.MarshalIndent(gemReq, "", "  "); err == nil {
 		slog.DebugContext(ctx, "gemini_request_json", "request", string(reqJSON))
+		if s.DumpLLM {
+			// Construct the same URL that the Gemini client will use
+			endpoint := cmp.Or(s.URL, "https://generativelanguage.googleapis.com/v1beta")
+			url := fmt.Sprintf("%s/models/%s:generateContent?key=%s", endpoint, cmp.Or(s.Model, DefaultModel), s.APIKey)
+			if err := llm.DumpToFile("request", url, reqJSON); err != nil {
+				slog.WarnContext(ctx, "failed to dump gemini request to file", "error", err)
+			}
+		}
 	}
 
 	// Create a Gemini model instance
@@ -540,6 +549,11 @@
 			// Log the structured Gemini response
 			if resJSON, err := json.MarshalIndent(gemRes, "", "  "); err == nil {
 				slog.DebugContext(ctx, "gemini_response_json", "response", string(resJSON))
+				if s.DumpLLM {
+					if err := llm.DumpToFile("response", "", resJSON); err != nil {
+						slog.WarnContext(ctx, "failed to dump gemini response to file", "error", err)
+					}
+				}
 			}
 			break
 		}