diff --git a/internal/atproto/lexicon/social/coves/community/defs.json b/internal/atproto/lexicon/social/coves/community/defs.json
index d362786..b7b765e 100644
--- a/internal/atproto/lexicon/social/coves/community/defs.json
+++ b/internal/atproto/lexicon/social/coves/community/defs.json
@@ -20,6 +20,7 @@
         "name": {
           "type": "string",
           "maxLength": 64,
+          "maxGraphemes": 64,
           "description": "Short community name"
         },
         "displayName": {
@@ -87,6 +88,7 @@
         "name": {
           "type": "string",
           "maxLength": 64,
+          "maxGraphemes": 64,
           "description": "Short community name"
         },
         "displayName": {
diff --git a/internal/atproto/lexicon/social/coves/community/post/get.json b/internal/atproto/lexicon/social/coves/community/post/get.json
index ea07d57..5e0f135 100644
--- a/internal/atproto/lexicon/social/coves/community/post/get.json
+++ b/internal/atproto/lexicon/social/coves/community/post/get.json
@@ -189,7 +189,7 @@
         },
         "blockedBy": {
           "type": "string",
-          "enum": ["author", "community", "moderator"],
+          "knownValues": ["author", "community", "moderator"],
           "description": "What caused the block: viewer blocked author, viewer blocked community, or post was removed by moderators"
         },
         "author": {
@@ -266,7 +266,7 @@
       "properties": {
         "vote": {
           "type": "string",
-          "enum": ["up", "down"],
+          "knownValues": ["up", "down"],
           "description": "Viewer's vote on this post"
         },
         "voteUri": {
diff --git a/internal/atproto/lexicon/social/coves/community/post/search.json b/internal/atproto/lexicon/social/coves/community/post/search.json
index 987f2a6..2b45cec 100644
--- a/internal/atproto/lexicon/social/coves/community/post/search.json
+++ b/internal/atproto/lexicon/social/coves/community/post/search.json
@@ -25,7 +25,7 @@
           },
           "type": {
             "type": "string",
-            "enum": ["text", "image", "video", "article", "microblog"],
+            "knownValues": ["text", "image", "video", "article", "microblog"],
             "description": "Filter by post type"
           },
           "tags": {
@@ -37,12 +37,12 @@
           },
           "sort": {
             "type": "string",
-            "enum": ["relevance", "new", "top"],
+            "knownValues": ["relevance", "new", "top"],
             "default": "relevance"
           },
           "timeframe": {
             "type": "string",
-            "enum": ["hour", "day", "week", "month", "year", "all"],
+            "knownValues": ["hour", "day", "week", "month", "year", "all"],
             "default": "all"
           },
           "limit": {
diff --git a/internal/atproto/lexicon/social/coves/community/post/update.json b/internal/atproto/lexicon/social/coves/community/post/update.json
index 101eee3..279377b 100644
--- a/internal/atproto/lexicon/social/coves/community/post/update.json
+++ b/internal/atproto/lexicon/social/coves/community/post/update.json
@@ -25,6 +25,7 @@
             "content": {
               "type": "string",
               "maxLength": 50000,
+              "maxGraphemes": 20000,
               "description": "Updated content - main text for text posts, description for media, etc."
             },
             "facets": {
@@ -72,6 +73,7 @@
             "editNote": {
               "type": "string",
               "maxLength": 300,
+              "maxGraphemes": 300,
               "description": "Optional note explaining the edit"
             }
           }
diff --git a/internal/atproto/lexicon/social/coves/community/profile.json b/internal/atproto/lexicon/social/coves/community/profile.json
index dac2a27..b12fa3c 100644
--- a/internal/atproto/lexicon/social/coves/community/profile.json
+++ b/internal/atproto/lexicon/social/coves/community/profile.json
@@ -13,6 +13,7 @@
           "name": {
             "type": "string",
             "maxLength": 64,
+            "maxGraphemes": 64,
             "description": "Short community name (local part of handle)"
           },
           "displayName": {
diff --git a/internal/atproto/lexicon/social/coves/community/search.json b/internal/atproto/lexicon/social/coves/community/search.json
index 98b203a..7b9862e 100644
--- a/internal/atproto/lexicon/social/coves/community/search.json
+++ b/internal/atproto/lexicon/social/coves/community/search.json
@@ -43,7 +43,7 @@
               "type": "array",
               "items": {
                 "type": "ref",
-                "ref": "social.coves.community.list#communityView"
+                "ref": "social.coves.community.defs#communityView"
               }
             },
             "cursor": {
diff --git a/internal/atproto/lexicon/social/coves/embed/external.json b/internal/atproto/lexicon/social/coves/embed/external.json
index a882740..ab50d87 100644
--- a/internal/atproto/lexicon/social/coves/embed/external.json
+++ b/internal/atproto/lexicon/social/coves/embed/external.json
@@ -15,11 +15,13 @@
         "title": {
           "type": "string",
           "maxLength": 500,
+          "maxGraphemes": 500,
           "description": "Title of the linked content"
         },
         "description": {
           "type": "string",
           "maxLength": 1000,
+          "maxGraphemes": 1000,
           "description": "Description or excerpt of the linked content"
         },
         "thumb": {
@@ -34,7 +36,7 @@
         },
         "embedType": {
           "type": "string",
-          "enum": ["article", "image", "video-stream"],
+          "knownValues": ["article", "image", "video-stream"],
           "description": "Type hint for special handling of known providers"
         },
         "provider": {
diff --git a/internal/atproto/lexicon/social/coves/embed/images.json b/internal/atproto/lexicon/social/coves/embed/images.json
index 130276b..4d58bf9 100644
--- a/internal/atproto/lexicon/social/coves/embed/images.json
+++ b/internal/atproto/lexicon/social/coves/embed/images.json
@@ -33,6 +33,7 @@
         "alt": {
           "type": "string",
           "maxLength": 1000,
+          "maxGraphemes": 1000,
           "description": "Alt text for accessibility"
         },
         "aspectRatio": {
diff --git a/internal/atproto/lexicon/social/coves/embed/video.json b/internal/atproto/lexicon/social/coves/embed/video.json
index f1f6f5b..d41d24a 100644
--- a/internal/atproto/lexicon/social/coves/embed/video.json
+++ b/internal/atproto/lexicon/social/coves/embed/video.json
@@ -22,16 +22,13 @@
         "alt": {
           "type": "string",
           "maxLength": 1000,
+          "maxGraphemes": 1000,
           "description": "Alt text describing video content"
         },
         "duration": {
           "type": "integer",
           "minimum": 0,
           "description": "Duration in seconds"
-        },
-        "aspectRatio": {
-          "type": "ref",
-          "ref": "social.coves.embed.image#aspectRatio"
         }
       }
     }
diff --git a/internal/atproto/lexicon/social/coves/federation/post.json b/internal/atproto/lexicon/social/coves/federation/post.json
deleted file mode 100644
index ee30232..0000000
--- a/internal/atproto/lexicon/social/coves/federation/post.json
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "social.coves.federation.post",
-  "defs": {
-    "main": {
-      "type": "object",
-      "description": "Reference to original federated post",
-      "required": ["platform", "uri"],
-      "properties": {
-        "platform": {
-          "type": "string",
-          "knownValues": ["bluesky", "lemmy", "atproto"],
-          "description": "Platform the post originated from"
-        },
-        "uri": {
-          "type": "string",
-          "format": "uri",
-          "description": "Original URI of the post (at:// URI for atproto platforms)"
-        },
-        "id": {
-          "type": "string",
-          "description": "Platform-specific post ID"
-        },
-        "originalCreatedAt": {
-          "type": "string",
-          "format": "datetime",
-          "description": "Timestamp when originally posted on source platform"
-        }
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/internal/atproto/lexicon/social/coves/feed/getAll.json b/internal/atproto/lexicon/social/coves/feed/getAll.json
index 27fec68..32dc6bf 100644
--- a/internal/atproto/lexicon/social/coves/feed/getAll.json
+++ b/internal/atproto/lexicon/social/coves/feed/getAll.json
@@ -10,26 +10,26 @@
         "properties": {
           "sort": {
             "type": "string",
-            "enum": ["hot", "top", "new"],
+            "knownValues": ["hot", "top", "new"],
             "default": "hot",
             "description": "Sort order for global feed"
           },
           "postType": {
             "type": "string",
-            "enum": ["text", "article", "image", "video", "microblog"],
+            "knownValues": ["text", "article", "image", "video", "microblog"],
             "description": "Filter by a single post type (computed from embed structure)"
           },
           "postTypes": {
             "type": "array",
             "items": {
               "type": "string",
-              "enum": ["text", "article", "image", "video", "microblog"]
+              "knownValues": ["text", "article", "image", "video", "microblog"]
             },
             "description": "Filter by multiple post types (computed from embed structure)"
           },
           "timeframe": {
             "type": "string",
-            "enum": ["hour", "day", "week", "month", "year", "all"],
+            "knownValues": ["hour", "day", "week", "month", "year", "all"],
             "default": "day",
             "description": "Timeframe for top sorting (only applies when sort=top)"
           },
@@ -54,7 +54,7 @@
               "type": "array",
               "items": {
                 "type": "ref",
-                "ref": "social.coves.feed.getTimeline#feedViewPost"
+                "ref": "social.coves.feed.defs#feedViewPost"
               }
             },
             "cursor": {
diff --git a/internal/atproto/lexicon/social/coves/feed/getCommunity.json b/internal/atproto/lexicon/social/coves/feed/getCommunity.json
index a0e1d40..6620403 100644
--- a/internal/atproto/lexicon/social/coves/feed/getCommunity.json
+++ b/internal/atproto/lexicon/social/coves/feed/getCommunity.json
@@ -16,13 +16,13 @@
           },
           "sort": {
             "type": "string",
-            "enum": ["hot", "top", "new"],
+            "knownValues": ["hot", "top", "new"],
             "default": "hot",
             "description": "Sort order for community feed"
           },
           "timeframe": {
             "type": "string",
-            "enum": ["hour", "day", "week", "month", "year", "all"],
+            "knownValues": ["hour", "day", "week", "month", "year", "all"],
             "default": "day",
             "description": "Timeframe for top sorting (only applies when sort=top)"
           },
@@ -47,7 +47,7 @@
               "type": "array",
               "items": {
                 "type": "ref",
-                "ref": "social.coves.feed.getTimeline#feedViewPost"
+                "ref": "social.coves.feed.defs#feedViewPost"
               }
             },
             "cursor": {
diff --git a/internal/atproto/lexicon/social/coves/feed/getDiscover.json b/internal/atproto/lexicon/social/coves/feed/getDiscover.json
index f86b0c4..898cc6d 100644
--- a/internal/atproto/lexicon/social/coves/feed/getDiscover.json
+++ b/internal/atproto/lexicon/social/coves/feed/getDiscover.json
@@ -10,13 +10,13 @@
         "properties": {
           "sort": {
             "type": "string",
-            "enum": ["hot", "top", "new"],
+            "knownValues": ["hot", "top", "new"],
             "default": "hot",
             "description": "Sort order for discover feed"
           },
           "timeframe": {
             "type": "string",
-            "enum": ["hour", "day", "week", "month", "year", "all"],
+            "knownValues": ["hour", "day", "week", "month", "year", "all"],
             "default": "day",
             "description": "Timeframe for top sorting (only applies when sort=top)"
           },
diff --git a/internal/atproto/lexicon/social/coves/feed/getTimeline.json b/internal/atproto/lexicon/social/coves/feed/getTimeline.json
index 8c2e298..74b77f2 100644
--- a/internal/atproto/lexicon/social/coves/feed/getTimeline.json
+++ b/internal/atproto/lexicon/social/coves/feed/getTimeline.json
@@ -10,13 +10,13 @@
         "properties": {
           "sort": {
             "type": "string",
-            "enum": ["hot", "top", "new"],
+            "knownValues": ["hot", "top", "new"],
             "default": "hot",
             "description": "Sort order for timeline feed"
           },
           "timeframe": {
             "type": "string",
-            "enum": ["hour", "day", "week", "month", "year", "all"],
+            "knownValues": ["hour", "day", "week", "month", "year", "all"],
             "default": "day",
             "description": "Timeframe for top sorting (only applies when sort=top)"
           },
diff --git a/internal/atproto/lexicon/social/coves/interaction/share.json b/internal/atproto/lexicon/social/coves/interaction/share.json
deleted file mode 100644
index c21cfe8..0000000
--- a/internal/atproto/lexicon/social/coves/interaction/share.json
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "social.coves.interaction.share",
-  "defs": {
-    "main": {
-      "type": "record",
-      "description": "Sharing a post to another community or platform",
-      "key": "tid",
-      "record": {
-        "type": "object",
-        "required": ["subject", "createdAt"],
-        "properties": {
-          "subject": {
-            "type": "string",
-            "format": "at-uri",
-            "description": "AT-URI of the post being shared"
-          },
-          "toCommunity": {
-            "type": "string",
-            "format": "at-uri",
-            "description": "Community being shared to (if applicable)"
-          },
-          "createdAt": {
-            "type": "string",
-            "format": "datetime"
-          }
-        }
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/internal/atproto/lexicon/social/coves/interaction/tag.json b/internal/atproto/lexicon/social/coves/interaction/tag.json
deleted file mode 100644
index bcc616b..0000000
--- a/internal/atproto/lexicon/social/coves/interaction/tag.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "social.coves.interaction.tag",
-  "defs": {
-    "main": {
-      "type": "record",
-      "description": "A tag applied to a post or comment",
-      "key": "tid",
-      "record": {
-        "type": "object",
-        "required": ["subject", "tag", "createdAt"],
-        "properties": {
-          "subject": {
-            "type": "string",
-            "format": "at-uri",
-            "description": "AT-URI of the post or comment being tagged"
-          },
-          "tag": {
-            "type": "string",
-            "minLength": 1,
-            "maxLength": 50,
-            "knownValues": ["helpful", "insightful", "spam", "hostile", "offtopic", "misleading"],
-            "description": "Predefined tag or custom community tag"
-          },
-          "createdAt": {
-            "type": "string",
-            "format": "datetime"
-          }
-        }
-      }
-    }
-  }
-}
\ No newline at end of file