The interactions interface is incompatible with the Vertex AI Express mode (API Key authentication).

Gemini API
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1

The interactions (NextGen) interface is incompatible with the Vertex AI Express mode (API Key authentication).

When using Express mode, the client initializer enforces a mutual exclusion between the API key and the project/location parameters. Because the project and location are missing, the SDK fails to construct the required Vertex AI resource path (/v1beta1/projects/{project}/locations/{location}/interactions). Instead, it falls back to a default path (/v1beta1/interactions) on the Gemini Developer API server, which does not exist and results in a 404 Not Found error.

To use the interactions interface, you must use the standard GCP Credentials authentication mode by providing a project, location, and valid Google Cloud credentials.

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good catch, this looks like a real gap between express mode and the interactions endpoint. worth filing it as a bug on the vertex ai sdk repo so its tracked: Issues · googleapis/python-aiplatform · GitHub. for now the workaround you found, standard gcp credentials with project and location, is the right move until express mode support is added.

3

Hi H9per,

Apologies for the slow response, I was double checking this internally. The answer right now is that Vertex doesn’t fully support the Interactions API, but that should change soon.

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Any document about supported interactions via API for now ?