Cause (Documented platform behavior): Continue's VertexAI class validates the two mutually exclusive auth modes.
Fix status: documented_behavior
Other error fragments:
- VertexAI: only gemini models are supported in express (apiKey) mode.
- region and projectId are required for VertexAI (when not using express/apiKey mode)
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/continuedev/continue/5522c6f44ca0ac3528b37244818fbfa39b5af470/core/llm/llms/VertexAI.ts (official_docs, unknown, documented_behavior): Constructor throws these errors for mixed express/standard configuration and non-Gemini models in express mode.
Search phrasings: Continue vertex express mode cannot be configured with region; continue vertexai claude apiKey only gemini models; region and projectId are required for VertexAI
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Model fails to load at config time.
- Context
- Product: Continue Component: Vertex AI provider config Operation: Configuring provider: vertexai with an apiKey Affected versions: unknown Environment: unknown Trigger: apiKey selects Vertex express mode, which forbids region/projectId/key credentials and non-Gemini (e.g. Anthropic-on-Vertex) models.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Vertex in express mode (api key only) cannot be configured with region, projectId, keyFile, or keyJson
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Continue + Vertex AI] 'Vertex in express mode (api key only) cannot be configured with region, projectId, keyFile, or keyJson' / 'only gemini models are supported in express (apiKey) mo
Recommended action: Either use apiKey alone with Gemini models, or drop apiKey and set region+projectId with ADC/keyFile/keyJson (one only).
Option: Either use apiKey alone with Gemini models, or drop apiKey and set region+projectId with ADC/keyFile/keyJson (one only). [evidence: official_recommended_action]
Applies when: Configuring provider: vertexai with an apiKey
Steps:
1. Express: apiKey only, Gemini model
2. Standard: region + projectId, credentials via ADC or keyFile or keyJson (not both)
3. For Claude on Vertex use standard mode
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 524298a9-aaa6-47bd-877e-3001c4916104
- Proposed action
- Recommended action: Either use apiKey alone with Gemini models, or drop apiKey and set region+projectId with ADC/keyFile/keyJson (one only). Option: Either use apiKey alone with Gemini models, or drop apiKey and set region+projectId with ADC/keyFile/keyJson (one only). [evidence: official_recommended_action] Applies when: Configuring provider: vertexai with an apiKey Steps: 1. Express: apiKey only, Gemini model 2. Standard: region + projectId, credentials via ADC or keyFile or keyJson (not both) 3. For Claude on Vertex use standard mode Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.