diff --git a/api/bsky/draftdefs.go b/api/bsky/draftdefs.go
index 4faca1c1..42bd5c9a 100644
--- a/api/bsky/draftdefs.go
+++ b/api/bsky/draftdefs.go
@@ -43,8 +43,9 @@ type DraftDefs_DraftEmbedExternal struct {
 
 // DraftDefs_DraftEmbedImage is a "draftEmbedImage" in the app.bsky.draft.defs schema.
 type DraftDefs_DraftEmbedImage struct {
-	Alt      *string                       `json:"alt,omitempty" cborgen:"alt,omitempty"`
-	LocalRef *DraftDefs_DraftEmbedLocalRef `json:"localRef" cborgen:"localRef"`
+	LexiconTypeID string                        `json:"$type" cborgen:"$type,const=app.bsky.draft.defs#draftEmbedImage"`
+	Alt           *string                       `json:"alt,omitempty" cborgen:"alt,omitempty"`
+	LocalRef      *DraftDefs_DraftEmbedLocalRef `json:"localRef" cborgen:"localRef"`
 }
 
 // DraftDefs_DraftEmbedLocalRef is a "draftEmbedLocalRef" in the app.bsky.draft.defs schema.
@@ -70,15 +71,44 @@ type DraftDefs_DraftEmbedVideo struct {
 // One of the posts that compose a draft.
 type DraftDefs_DraftPost struct {
 	EmbedExternals []*DraftDefs_DraftEmbedExternal `json:"embedExternals,omitempty" cborgen:"embedExternals,omitempty"`
-	EmbedImages    []*DraftDefs_DraftEmbedImage    `json:"embedImages,omitempty" cborgen:"embedImages,omitempty"`
-	EmbedRecords   []*DraftDefs_DraftEmbedRecord   `json:"embedRecords,omitempty" cborgen:"embedRecords,omitempty"`
-	EmbedVideos    []*DraftDefs_DraftEmbedVideo    `json:"embedVideos,omitempty" cborgen:"embedVideos,omitempty"`
+	// embedGallery: The schema-level maxLength of 20 is a future-proof ceiling. Clients should currently enforce a soft limit of 10 items in authoring UIs.
+	EmbedGallery []*DraftDefs_DraftPost_EmbedGallery_Elem `json:"embedGallery,omitempty" cborgen:"embedGallery,omitempty"`
+	EmbedImages  []*DraftDefs_DraftEmbedImage             `json:"embedImages,omitempty" cborgen:"embedImages,omitempty"`
+	EmbedRecords []*DraftDefs_DraftEmbedRecord            `json:"embedRecords,omitempty" cborgen:"embedRecords,omitempty"`
+	EmbedVideos  []*DraftDefs_DraftEmbedVideo             `json:"embedVideos,omitempty" cborgen:"embedVideos,omitempty"`
 	// labels: Self-label values for this post. Effectively content warnings.
 	Labels *DraftDefs_DraftPost_Labels `json:"labels,omitempty" cborgen:"labels,omitempty"`
 	// text: The primary post content. It has a higher limit than post contents to allow storing a larger text that can later be refined into smaller posts.
 	Text string `json:"text" cborgen:"text"`
 }
 
+type DraftDefs_DraftPost_EmbedGallery_Elem struct {
+	DraftDefs_DraftEmbedImage *DraftDefs_DraftEmbedImage
+}
+
+func (t *DraftDefs_DraftPost_EmbedGallery_Elem) MarshalJSON() ([]byte, error) {
+	if t.DraftDefs_DraftEmbedImage != nil {
+		t.DraftDefs_DraftEmbedImage.LexiconTypeID = "app.bsky.draft.defs#draftEmbedImage"
+		return json.Marshal(t.DraftDefs_DraftEmbedImage)
+	}
+	return nil, fmt.Errorf("can not marshal empty union as JSON")
+}
+
+func (t *DraftDefs_DraftPost_EmbedGallery_Elem) UnmarshalJSON(b []byte) error {
+	typ, err := lexutil.TypeExtract(b)
+	if err != nil {
+		return err
+	}
+
+	switch typ {
+	case "app.bsky.draft.defs#draftEmbedImage":
+		t.DraftDefs_DraftEmbedImage = new(DraftDefs_DraftEmbedImage)
+		return json.Unmarshal(b, t.DraftDefs_DraftEmbedImage)
+	default:
+		return nil
+	}
+}
+
 // Self-label values for this post. Effectively content warnings.
 type DraftDefs_DraftPost_Labels struct {
 	LabelDefs_SelfLabels *comatproto.LabelDefs_SelfLabels
diff --git a/lexicons/app/bsky/draft/defs.json b/lexicons/app/bsky/draft/defs.json
index 9062cd44..85278e7b 100644
--- a/lexicons/app/bsky/draft/defs.json
+++ b/lexicons/app/bsky/draft/defs.json
@@ -95,6 +95,12 @@
           "items": { "type": "ref", "ref": "#draftEmbedImage" },
           "maxLength": 4
         },
+        "embedGallery": {
+          "type": "array",
+          "items": { "type": "union", "refs": ["#draftEmbedImage"] },
+          "maxLength": 20,
+          "description": "The schema-level maxLength of 20 is a future-proof ceiling. Clients should currently enforce a soft limit of 10 items in authoring UIs."
+        },
         "embedVideos": {
           "type": "array",
           "items": { "type": "ref", "ref": "#draftEmbedVideo" },