fix(tools): dedupe bundled plugin toolsets with built-in entries (#15634)

`hermes tools` → "reconfigure existing" listed Spotify twice because
the Apr 24 refactor that moved Spotify into plugins/spotify/ (PR #15174)
left the entry in CONFIGURABLE_TOOLSETS. _get_effective_configurable_toolsets()
unconditionally appended get_plugin_toolsets() on top, so the same
'spotify' key showed up from both sources.

Dedupe by key — built-in CONFIGURABLE_TOOLSETS entry wins (it has the
nicer label and description). Also guards against future bundled plugins
that share a toolset key with a built-in.

hermes_cli/tools_config.py

@@ -103,13 +103,23 @@ def _get_effective_configurable_toolsets():
     """Return CONFIGURABLE_TOOLSETS + any plugin-provided toolsets.
 
     Plugin toolsets are appended at the end so they appear after the
-    built-in toolsets in the TUI checklist.
+    built-in toolsets in the TUI checklist. A plugin whose toolset key
+    already appears in ``CONFIGURABLE_TOOLSETS`` is skipped — bundled
+    plugins (e.g. ``plugins/spotify``) share their toolset key with the
+    built-in entry, and we want the built-in label/description to win.
+    Without the dedupe, ``hermes tools`` → "reconfigure existing" would
+    list the same toolset twice.
     """
     result = list(CONFIGURABLE_TOOLSETS)
+    seen = {ts_key for ts_key, _, _ in result}
     try:
         from hermes_cli.plugins import discover_plugins, get_plugin_toolsets
         discover_plugins()  # idempotent — ensures plugins are loaded
-        result.extend(get_plugin_toolsets())
+        for entry in get_plugin_toolsets():
+            if entry[0] in seen:
+                continue
+            seen.add(entry[0])
+            result.append(entry)
     except Exception:
         pass
     return result

tests/hermes_cli/test_tools_config.py

@@ -766,3 +766,24 @@ def test_get_platform_tools_feishu_tools_not_on_other_platforms():
         enabled = _get_platform_tools({}, plat)
         assert "feishu_doc" not in enabled, f"feishu_doc leaked onto {plat}"
         assert "feishu_drive" not in enabled, f"feishu_drive leaked onto {plat}"
+
+
+def test_get_effective_configurable_toolsets_dedupes_bundled_plugins():
+    """Bundled plugins (plugins/spotify) share their toolset key with the
+    built-in CONFIGURABLE_TOOLSETS entry. The effective list must not list
+    them twice — otherwise `hermes tools` → "reconfigure existing" shows
+    the same toolset two rows in a row.
+    """
+    from hermes_cli.tools_config import _get_effective_configurable_toolsets
+
+    all_ts = _get_effective_configurable_toolsets()
+    keys = [ts_key for ts_key, _, _ in all_ts]
+    assert len(keys) == len(set(keys)), (
+        f"duplicate toolset keys in effective list: "
+        f"{[k for k in keys if keys.count(k) > 1]}"
+    )
+    # Spotify specifically — the bug that motivated the dedupe.
+    spotify_rows = [t for t in all_ts if t[0] == "spotify"]
+    assert len(spotify_rows) == 1, spotify_rows
+    # Built-in label wins over the plugin label.
+    assert spotify_rows[0][1] == "🎵 Spotify"