diff --git a/internal/client/executor.go b/internal/client/executor.go
index ac6f6ea..27aa25b 100644
--- a/internal/client/executor.go
+++ b/internal/client/executor.go
@@ -195,6 +195,7 @@ func (c *Client) executeWithContext(ctx context.Context, spec *command.Spec, inv
 		return nil, &clierrors.CLIError{
 			Code:     "network_error",
 			Message:  fmt.Sprintf("request failed: %v", err),
+			Hint:     "This is usually a temporary network issue. If it persists, check your connection",
 			ExitCode: clierrors.ExitGeneral,
 		}
 	}
diff --git a/internal/client/executor_test.go b/internal/client/executor_test.go
index 28deb3d..1b51e51 100644
--- a/internal/client/executor_test.go
+++ b/internal/client/executor_test.go
@@ -245,6 +245,9 @@ func TestExecute_NetworkError(t *testing.T) {
 	if cliErr.Code != "network_error" {
 		t.Errorf("Code = %q, want %q", cliErr.Code, "network_error")
 	}
+	if cliErr.Hint == "" {
+		t.Error("Hint should be non-empty for network errors")
+	}
 }
 
 func TestExecute_RetryOn429(t *testing.T) {
diff --git a/internal/errors/errors.go b/internal/errors/errors.go
index c0c5c17..a81e6ea 100644
--- a/internal/errors/errors.go
+++ b/internal/errors/errors.go
@@ -106,7 +106,10 @@ func FromAPIError(statusCode int, apiErr *APIError, requestID string) *CLIError
 		}
 	}
 
-	hint := hintForAPICode(code)
+	hint := hintForAPICode(apiErr.Code)
+	if apiErr.Code == "invalid_parameter" && apiErr.Param != nil && *apiErr.Param != "" {
+		hint = fmt.Sprintf("Invalid field %q. %s", *apiErr.Param, hint)
+	}
 
 	return &CLIError{
 		Code:      code,
@@ -122,11 +125,23 @@ func FromAPIError(statusCode int, apiErr *APIError, requestID string) *CLIError
 func hintForAPICode(code string) string {
 	switch code {
 	case "avatar_not_found":
-		return "List available avatars: heygen avatar list"
+		return "This avatar does not exist. Retrying the same ID is unlikely to help. List avatars: heygen avatar list"
 	case "video_not_found":
-		return "List your videos: heygen video list"
+		return "This resource does not exist. Retrying the same ID is unlikely to help. List your videos: heygen video list"
 	case "voice_not_found":
-		return "List available voices: heygen voice list"
+		return "This voice does not exist. Retrying the same ID is unlikely to help. List voices: heygen voice list"
+	case "insufficient_credit":
+		return "Check your credit balance: heygen user me get"
+	case "invalid_parameter":
+		return "Use --request-schema on the command to see expected fields"
+	case "rate_limited":
+		return "The CLI retries rate-limited requests automatically. If this persists, reduce request frequency"
+	case "resource_not_found", "not_found":
+		return "The requested resource does not exist. Retrying the same ID is unlikely to help"
+	case "asset_not_available":
+		return "The asset may still be processing or was deleted"
+	case "timeout":
+		return "The operation may still be in progress. Check status with the corresponding get command"
 	}
 	return ""
 }
diff --git a/internal/errors/errors_test.go b/internal/errors/errors_test.go
index 55ae1e5..a04810f 100644
--- a/internal/errors/errors_test.go
+++ b/internal/errors/errors_test.go
@@ -160,6 +160,69 @@ func TestFromAPIError_UnknownCode_NoHint(t *testing.T) {
 	}
 }
 
+func TestHintForAPICode_AllMappedCodes(t *testing.T) {
+	codes := []struct {
+		code         string
+		wantContains string
+	}{
+		{"avatar_not_found", "heygen avatar list"},
+		{"video_not_found", "heygen video list"},
+		{"voice_not_found", "heygen voice list"},
+		{"insufficient_credit", "heygen user me get"},
+		{"invalid_parameter", "--request-schema"},
+		{"rate_limited", "retries rate-limited"},
+		{"resource_not_found", "does not exist"},
+		{"not_found", "does not exist"},
+		{"asset_not_available", "may still be processing"},
+		{"timeout", "may still be in progress"},
+	}
+	for _, tt := range codes {
+		t.Run(tt.code, func(t *testing.T) {
+			hint := hintForAPICode(tt.code)
+			if hint == "" {
+				t.Fatalf("hintForAPICode(%q) returned empty", tt.code)
+			}
+			if !strings.Contains(hint, tt.wantContains) {
+				t.Errorf("hint = %q, want it to contain %q", hint, tt.wantContains)
+			}
+		})
+	}
+}
+
+func TestFromAPIError_Generic404_NoPermanenceHint(t *testing.T) {
+	apiErr := &APIError{Message: "not found"}
+	cliErr := FromAPIError(404, apiErr, "")
+
+	if strings.Contains(cliErr.Hint, "unlikely to help") {
+		t.Errorf("Hint = %q, generic 404 without API code should not claim permanence", cliErr.Hint)
+	}
+}
+
+func TestFromAPIError_InvalidParam_WithParamName(t *testing.T) {
+	param := "avatar_id"
+	apiErr := &APIError{Code: "invalid_parameter", Message: "bad value", Param: &param}
+	cliErr := FromAPIError(400, apiErr, "")
+
+	if !strings.Contains(cliErr.Hint, "avatar_id") {
+		t.Errorf("Hint = %q, want param name in hint", cliErr.Hint)
+	}
+	if !strings.Contains(cliErr.Hint, "--request-schema") {
+		t.Errorf("Hint = %q, want --request-schema in hint", cliErr.Hint)
+	}
+}
+
+func TestFromAPIError_InvalidParam_NilParam(t *testing.T) {
+	apiErr := &APIError{Code: "invalid_parameter", Message: "bad value"}
+	cliErr := FromAPIError(400, apiErr, "")
+
+	if strings.Contains(cliErr.Hint, "Invalid field") {
+		t.Errorf("Hint = %q, should not mention field when param is nil", cliErr.Hint)
+	}
+	if !strings.Contains(cliErr.Hint, "--request-schema") {
+		t.Errorf("Hint = %q, want --request-schema in hint", cliErr.Hint)
+	}
+}
+
 func TestConstructors(t *testing.T) {
 	t.Run("New", func(t *testing.T) {
 		err := New("something broke")