diff --git a/.emmyrc.json b/.emmyrc.json
index ed94013e..90fcb9f6 100644
--- a/.emmyrc.json
+++ b/.emmyrc.json
@@ -3,6 +3,11 @@
     "runtime": {
         "version": "LuaJIT"
     },
+    "diagnostics": {
+        "enables": [
+            "missing-global-doc"
+        ]
+    },
     "workspace": {
         "library": [
             "$VIMRUNTIME",
diff --git a/lua/opencode/ui/session_picker.lua b/lua/opencode/ui/session_picker.lua
index 654af1a9..5503ce95 100644
--- a/lua/opencode/ui/session_picker.lua
+++ b/lua/opencode/ui/session_picker.lua
@@ -31,7 +31,7 @@ end
 ---@param session Session|GlobalSession object
 ---@param width? integer
 ---@return PickerItem
-function format_session_item(session, width)
+local function format_session_item(session, width)
   local project = (session --[[@as GlobalSession]]).project
   local title = session.title or 'N/A'
   if project then
diff --git a/lua/opencode/ui/timeline_picker.lua b/lua/opencode/ui/timeline_picker.lua
index e55fe39b..8d227984 100644
--- a/lua/opencode/ui/timeline_picker.lua
+++ b/lua/opencode/ui/timeline_picker.lua
@@ -6,7 +6,7 @@ local base_picker = require('opencode.ui.base_picker')
 ---Format message parts for timeline picker
 ---@param msg OpencodeMessage Message object
 ---@return PickerItem
-function format_message_item(msg, width)
+local function format_message_item(msg, width)
   local preview = msg.parts and msg.parts[1] and msg.parts[1].text or ''
 
   local debug_text = 'ID: ' .. (msg.info.id or 'N/A')