[Desktop/Web UI] Support 'vertex' provider and Service Account JSON upload in GUI

[c193764582]

Summary

Currently, Hermes Agent v0.18.0 (v2026.7.1) natively supports the GCP vertex provider with enterprise-grade Service Account JSON authentication and automatic OAuth2 token refreshing (which is a massive and excellent update!).

However, there is a major feature gap/bug in the Desktop GUI (Electron app) / Web UI (Hermes Studio):

1. The sidebar's provider selection dropdown does not list vertex as a selectable provider (even if it's correctly configured as the default provider in config.yaml).
2. There is no input field or file-uploader in the Web UI / Desktop settings page to upload or specify the path for the Service Account JSON credentials file (gcp-service-account.json).

Because of this, users who want to run the agent in the GUI or Web UI are permanently locked out of utilizing the new Vertex AI (vertex) provider and are instead forced back into using other CLI-fallback providers like OpenRouter or AI Studio, or running strictly on TUI.

Steps to Reproduce

1. Configure config.yaml to use provider: vertex with google/gemini-2.5-flash.
2. Open Hermes Desktop App (Electron) or Hermes Studio Web UI (127.0.0.1:8748).
3. Notice that the sidebar dropdown forces the provider back to OpenRouter or other preset choices, and vertex is completely missing from the sidebar dropdown.
4. Try to find a way to specify the Google Service Account JSON path in the UI — there is no such input field.

Proposed Solution

1. Widen the GUI dropdown providers list: Explicitly append "vertex" to the hardcoded preset providers list in the GUI React components (or dynamically read enabled providers from the backend's active profile/config).
2. Add a Credential File Uploader:
   • In the settings panel for vertex, add a file picker (or text input for absolute path) to map vertex.credentials_path (storing the path in config.yaml or writing it to .env as VERTEX_CREDENTIALS_PATH).
   • Alternatively, support the new Google Cloud static API keys for Vertex AI (which was recently released by Google as part of the "Gemini Enterprise Agent Platform" rebranding).

Expected Behavior

Users should be able to fully select Vertex AI (vertex provider) directly in the Desktop GUI sidebar and input their credentials (either JSON path or static API key) to enjoy the enterprise-grade Gemini models with zero friction.

[douglasg14b]

yes, very much so. I was excited to see that Vertex was supported, but quite frustrated to find that it doesn't work with the desktop app which is kind of an awkward place to be. It seems support in the desktop app was missed, which is understandable.

That said, this is a bug report, not a feature request. @alt-glitch

[teknium1]

This is implemented on current main; thanks for reporting the desktop/dashboard parity gap.

Automated hermes-sweeper review found:

• 3f6c6bd29e25441b8d36fbe934b019df13fff0b1 (fix(vertex): surface Vertex on the desktop Keys tab for provider parity) adds Vertex's service-account JSON path to the Desktop Keys tab.
• hermes_cli/web_server.py:6202 maps VERTEX_CREDENTIALS_PATH to the Vertex provider card as a non-password service-account JSON path field.
• hermes_cli/models.py:1071 includes vertex in the shared canonical provider inventory, and /api/model/options backs both Desktop and dashboard pickers (hermes_cli/web_server.py:5507).
• The provider-parity contract in tests/hermes_cli/test_provider_parity.py:59 covers that every hermes model provider is configurable from the Desktop Providers tabs.

The fixing commit is contained in v2026.7.1.