> For the complete documentation index, see [llms.txt](https://wiki.crosswatch.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.crosswatch.app/blueprint-architecture/sync/engine-level-features/watchlist.md).

# Watchlist

{% tabs %}
{% tab title="End users" %}
Watchlist means: **“I plan to watch this.”**

It is **set-like**:

* present → keep it
* missing → remove it (only if you enabled **Remove**)

{% hint style="warning" %}
Start **add-only**.

Remove can delete real user data.
{% endhint %}

Related:

* Pair toggles: [Configure Pairs](/crosswatch/configure-pairs.md)
* Matching improvements: [Metadata](/crosswatch/providers/metadata-id-mapping.md)
  {% endtab %}

{% tab title="Power users" %}
**Feature:** `watchlist`

### Contract

* read: `build_index(...) -> dict[canonical_key -> item]`
* write: `add(items)` / `remove(items)`

### Canonical keys & IDs

Watchlist works best when items carry stable IDs under `ids`:

* `tmdb`, `imdb`, `tvdb` (plus provider-specific IDs)

If two providers disagree on the “best key”, the orchestrator may re-key and coalesce.

### Index semantics across providers

* `JELLYFIN`: `present`
* `MDBLIST`: `present`
* `PLEX`: `present`
* `PUBLICMETADB`: `present`
* `SIMKL`: `delta`
* `TMDB`: `present`
* `TRAKT`: `present`

### Providers that implement Watchlist

* `JELLYFIN`
* `MDBLIST`
* `PLEX`
* `PUBLICMETADB`
* `SIMKL`
* `TMDB`
* `TRAKT`
  {% endtab %}
  {% endtabs %}


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