fix: preserve local timezone in skill sync state

internal/skillscheck/sync.go

@@ -335,7 +335,7 @@ func SyncSkills(opts SyncOptions) *SyncResult {
 		UpdatedSkills:        plan.ToUpdate,
 		AddedOfficialSkills:  plan.Added,
 		SkippedDeletedSkills: plan.SkippedDeleted,
-		UpdatedAt:            opts.Now().UTC().Format(time.RFC3339),
+		UpdatedAt:            opts.Now().Format(time.RFC3339),
 	}
 	if err := WriteState(state); err != nil {
 		result.Action = "failed"
@@ -428,7 +428,7 @@ func fallbackFullInstall(opts SyncOptions, reason string, official []string) *Sy
 		UpdatedSkills:        official,
 		AddedOfficialSkills:  official,
 		SkippedDeletedSkills: []string{},
-		UpdatedAt:            opts.Now().UTC().Format(time.RFC3339),
+		UpdatedAt:            opts.Now().Format(time.RFC3339),
 	}
 	if writeErr := WriteState(state); writeErr != nil {
 		return &SyncResult{

internal/skillscheck/sync_test.go

@@ -322,6 +322,7 @@ func (f *fakeSkillsRunner) InstallAllSkills() *selfupdate.NpmResult {
 func TestSyncSkills_WritesStateAndDoesNotWriteStamp(t *testing.T) {
 	dir := t.TempDir()
 	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", dir)
+	localZone := time.FixedZone("UTC+8", 8*60*60)
 	if err := WriteState(SkillsState{
 		Version:        "1.0.30",
 		OfficialSkills: []string{"lark-calendar", "lark-mail"},
@@ -339,7 +340,7 @@ func TestSyncSkills_WritesStateAndDoesNotWriteStamp(t *testing.T) {
 	result := SyncSkills(SyncOptions{
 		Version: "1.0.33",
 		Runner:  runner,
-		Now:     func() time.Time { return time.Date(2026, 5, 18, 12, 0, 0, 0, time.UTC) },
+		Now:     func() time.Time { return time.Date(2026, 5, 18, 20, 0, 0, 0, localZone) },
 	})
 
 	if result.Err != nil {
@@ -361,6 +362,9 @@ func TestSyncSkills_WritesStateAndDoesNotWriteStamp(t *testing.T) {
 	assertStrings(t, state.UpdatedSkills, []string{"lark-calendar", "lark-new"})
 	assertStrings(t, state.AddedOfficialSkills, []string{"lark-new"})
 	assertStrings(t, state.SkippedDeletedSkills, []string{"lark-mail"})
+	if state.UpdatedAt != "2026-05-18T20:00:00+08:00" {
+		t.Fatalf("UpdatedAt = %q, want local RFC3339 timestamp with offset preserved", state.UpdatedAt)
+	}
 	if _, err := os.Stat(filepath.Join(dir, "skills.stamp")); !os.IsNotExist(err) {
 		t.Fatalf("skills.stamp exists or stat failed with unexpected err: %v", err)
 	}

skills/lark-im/SKILL.md

@@ -92,13 +92,13 @@ Shortcut 是对常用操作的高级封装（`lark-cli im +<verb> [flags]`）。
 |----------|------|
 | [`+chat-create`](references/lark-im-chat-create.md) | Create a group chat or topic chat; user/bot; --chat-mode group|topic; private/public; invites users/bots; optionally sets bot manager |
 | [`+chat-list`](references/lark-im-chat-list.md) | List chats the current user/bot is a member of; defaults to groups; pass --types=p2p,group to include p2p single chats (user-only); user/bot; supports sorting, pagination, --exclude-muted (user-only) |
-| [`+chat-messages-list`](references/lark-im-chat-messages-list.md) | List messages in a chat or P2P conversation; user/bot; accepts `--chat-id` or `--user-id`, resolves P2P chat_id; key params: `--page-size` (not `--page-limit`), `--start`/`--end` for time range, `--sort asc\|desc`; **read reference before use** |
+| [`+chat-messages-list`](references/lark-im-chat-messages-list.md) | List messages in a chat or P2P conversation; user/bot; accepts --chat-id or --user-id, resolves P2P chat_id, supports time range/sort/pagination |
 | [`+chat-search`](references/lark-im-chat-search.md) | Search visible group chats by --query keyword and/or --member-ids; user/bot; e.g. look up chat_id by group name; supports type filters, sorting, pagination, and --exclude-muted (user identity only) |
 | [`+chat-update`](references/lark-im-chat-update.md) | Update group chat name or description; user/bot; updates a chat's name or description |
 | [`+messages-mget`](references/lark-im-messages-mget.md) | Batch get messages by IDs; user/bot; fetches up to 50 om_ message IDs, formats sender names, expands thread replies |
 | [`+messages-reply`](references/lark-im-messages-reply.md) | Reply to a message (supports thread replies); user/bot; supports text/markdown/post/media replies, reply-in-thread, idempotency key |
 | [`+messages-resources-download`](references/lark-im-messages-resources-download.md) | Download images/files from a message; user/bot; supports automatic chunked download for large files (8MB chunks), auto-detects file extension from Content-Type |
-| [`+messages-search`](references/lark-im-messages-search.md) | Search messages across chats; **user-only** (`--as user`); key params: `--query`, `--chat-id` (single, comma-sep; **not** `--chat-ids`), `--sender`, `--start`/`--end`, `--page-all`/`--page-limit`; **read reference before use** |
+| [`+messages-search`](references/lark-im-messages-search.md) | Search messages across chats (supports keyword, sender, time range filters) with user identity; user-only; filters by chat/sender/attachment/time, supports auto-pagination via `--page-all` / `--page-limit`, enriches results via batched mget and chats batch_query |
 | [`+messages-send`](references/lark-im-messages-send.md) | Send a message to a chat or direct message; user/bot; sends to chat-id or user-id with text/markdown/post/media, supports idempotency key |
 | [`+threads-messages-list`](references/lark-im-threads-messages-list.md) | List messages in a thread; user/bot; accepts om_/omt_ input, resolves message IDs to thread_id, supports sort/pagination |
 | [`+flag-create`](references/lark-im-flag-create.md) | Create a bookmark on a message; user-only; defaults to message-layer flag; use --flag-type feed for feed-layer flag (item_type auto-detected from chat mode) |