Choose the awkward neighbour
A rule that includes one desired item may still include dozens of unrelated ones. Pick an existing library item similar in one respect but wrong in another. For an original example, two owned project clips may share a short duration while only one carries the intended project label.
Inspect the metadata dependency
Channels Smart Rules select content from library criteria and update as library membership changes. Compare the actual metadata of the desired and excluded specimens. Add one meaningful criterion at a time and inspect the result after each addition.
Do not make the excluded item’s metadata false simply to remove it from the collection. The collection should express its own purpose. If the required distinction is not present in the library, add an accurate maintenance label or keep membership manual until the policy is clear.
Record a small acceptance set
Keep the included item, excluded neighbour and expected result in the collection note. Recheck them after changing the rule or the metadata it depends on. This is more durable than a screenshot showing only a plausible collection name.
No Smart Rule was run here. The article contributes a focused validation method, with no claim about how many items any real library will return.
Questions answered
Is one matching title enough to validate a rule?
No. Check an item that shares some properties but should be excluded.
What if accurate metadata cannot distinguish the items?
Use an appropriate label or deliberate manual selection rather than distorting metadata.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.