From either swh-mirror-forge or python3 toplevel:

>>> r = requests.post('https://forge.softwareheritage.org/api/diffusion.repository.search', data={'api.token': 'api-token-redacted', 'attachments': {'uris': True}, 'constraints': {'ids': [78]}})
>>> r.json()
{'error_code': 'ERR-CONDUIT-CORE', 'error_info': 'Argument 1 passed to PhabricatorSearchField::getValueExistsInConduitRequest() must be of the type array, string given, called in /srv/phabricator/phabricator/src/applications/search/engine/PhabricatorApplicationSearchEngine.php on line 1118 and defined', 'result': None}
>>> r.ok
True

which works ok from the conduit api ui:

```text
Method	 diffusion.repository.search

queryKey X

constraints	{  "ids": [    78  ]}

attachments	{  "uris": true }

order	X

before	X

after	X

limit  X
```