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`_register_skill_group` captured the skill catalog in closure variables (`entries` and `skill_lookup`) so the single `tree.add_command` call at startup owned the only live copy. The closure is never re-entered after startup, so `/reload-skills` — which rescans the on-disk skills dir and refreshes the in-process `_skill_commands` registry — had no way to propagate results into the `/skill` autocomplete on Discord. New skills stayed invisible in the dropdown, and deleted skills returned "Unknown skill" when the stale autocomplete entry was clicked. The fix is purely a dataflow change: promote `entries` and `skill_lookup` to instance attributes (`_skill_entries`, `_skill_lookup`), split the collector-driven rebuild into a helper (`_refresh_skill_catalog_state`), and add a public `refresh_skill_group()` method that re-runs the helper and is safe to call at any point after the initial registration. The gateway's `_handle_reload_skills_command` then iterates `self.adapters` and calls `refresh_skill_group()` on any adapter that exposes it (currently only Discord). Both sync and async implementations are supported; adapters that don't override the method (Telegram's BotCommand menu, Slack subcommand map, etc.) are silently skipped — the in-process `reload_skills()` call covers them. No `tree.sync()` is required because Discord fetches autocomplete options dynamically on every keystroke — mutating the instance state the callbacks already read from is sufficient. That sidesteps the per-app command-bucket rate limit (~5 writes / 20 s) that made the previous bulk-sync-on-reload approach unusable (#16713 context). Tests: tests/gateway/test_reload_skills_discord_resync.py — five cases covering (1) refresh replaces entries, (2) entries stay sorted after refresh, (3) collector exception leaves cached state intact, (4) `_refresh_skill_catalog_state` populates the instance attrs, (5) orchestrator calls `refresh_skill_group()` on sync + async adapters and skips adapters that don't expose it.