docs: correct nonexistent google-adk[vertexai] extra to [gcp] - #2132
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The `vertexai` extra does not exist in google-adk's pyproject.toml, so `pip install google-adk[vertexai]` silently installs the base package without the Agent Platform dependencies. Readers following these snippets hit an ImportError when constructing VertexAiSessionService or VertexAiMemoryBankService. The correct extra is `gcp`, which pulls in google-cloud-aiplatform[agent-engines]. Follow-up to review feedback on #2031, which flagged the two occurrences in express-mode.md. The same stale extra appears once in sessions/session/index.md, fixed here too.
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happyhuman
self-requested a review
August 19, 2026 15:18
happyhuman
approved these changes
Aug 19, 2026
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The
vertexaiextra does not exist in google-adk's pyproject.toml, sopip install google-adk[vertexai]silently installs the base package without the Agent Platform dependencies. Readers following these snippets hit an ImportError when constructing VertexAiSessionService or VertexAiMemoryBankService.The correct extra is
gcp, which pulls ingoogle-cloud-aiplatform[agent-engines].
Follow-up to review feedback on #2031, which flagged the two occurrences in express-mode.md. The same stale extra appears once in sessions/session/index.md, fixed here too.