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Project	Deployment	Review	Updated (UTC)
docs	Skipped		Dec 23, 2025 9:04pm

Greptile Summary

This PR adds Vertex AI OAuth support across all LLM-based blocks (Agent, Evaluator, Router, Translate) and fixes a critical bug in OAuth token refresh.

Key Changes:

• Added vertexCredential OAuth input field to Evaluator, Router, and Translate blocks (Agent already had it)
• Marked Vertex AI project and location fields as required across all blocks
• Updated API key visibility logic to hide the API key field when Vertex models are selected (OAuth is used instead)
• Added credential resolution logic in block handlers to fetch and refresh OAuth authentication
• Fixed OAuth token refresh bug: previously used vertex as base provider (incorrect), now correctly maps vertex-ai service to google base provider using getBaseProviderForService() function

Implementation Details:

• Block definitions now conditionally show OAuth input and hide API key when Vertex models are selected
• Block handlers (evaluator, router) resolve vertexCredential to authentication before making API calls
• The /api/providers route handles vertexCredential parameter and resolves it before provider execution
• OAuth refresh logic now properly traverses the provider service hierarchy to find the correct base provider

Confidence Score: 5/5

• This PR is safe to merge with no concerns
• The changes are well-structured and consistent across all affected blocks. The OAuth token refresh fix addresses a real bug that would have caused authentication failures. All changes follow established patterns in the codebase, and the implementation is complete with proper parameter passing through all layers (blocks → handlers → API routes).
• No files require special attention

Important Files Changed

Sequence Diagram

sequenceDiagram
    participant User
    participant Block as LLM Block<br/>(Evaluator/Router/Translate/Agent)
    participant Handler as Block Handler
    participant ProvidersAPI as /api/providers
    participant OAuth as OAuth Utils
    participant DB as Database
    participant Vertex as Vertex AI API

    User->>Block: Select Vertex model
    Block->>User: Show OAuth input plus required fields
    User->>Block: Authenticate and provide project location
    Block->>Handler: Execute with vertexCredential ID
    Handler->>DB: Query credential by ID
    DB-->>Handler: Return credential record
    Handler->>OAuth: Call refreshTokenIfNeeded
    OAuth->>OAuth: Map vertex-ai service to google base
    OAuth->>Vertex: Request updated authentication
    Vertex-->>OAuth: Provide updated authentication
    OAuth-->>Handler: Return authentication
    Handler->>ProvidersAPI: POST request with authentication
    ProvidersAPI->>DB: Query credential again
    DB-->>ProvidersAPI: Return credential record
    ProvidersAPI->>OAuth: Call refreshTokenIfNeeded
    OAuth-->>ProvidersAPI: Return authentication
    ProvidersAPI->>Vertex: Make API call
    Vertex-->>ProvidersAPI: LLM response
    ProvidersAPI-->>Handler: Response
    Handler-->>Block: Execution result
    Block-->>User: Display output