[FEATURE]: Better provider management settings in the desktop client #62448

Feature hasn't been suggested before

• I have verified this feature I'm about to request hasn't been suggested before (related but non-duplicate issues are linked below).

Describe the enhancement you want to request

Summary

Provider management in the OpenCode desktop client needs a serious rework. Compared with other coding-agent harnesses/clients, managing external model providers in the desktop app still falls far short, and honestly the current approach feels user-hostile to me. There is no way to manage my providers with a normal, predictable operational flow — and the same problem extends to most of OpenCode's settings, which currently can only be changed by hand-editing opencode.json instead of in the GUI.

Current pain points

1. No full provider management in the UI. The desktop client has no complete add / edit / delete flow for external model providers. Adding or adjusting a custom provider means manually editing opencode.json, and fixing a typo means going back into JSON by hand again.
2. No API key management or connectivity test. There is no way to view/update a stored API key from the UI and no "test connection" action. When a key or base URL is wrong, the only feedback is a failed request somewhere downstream, so users are left guessing what is misconfigured.
3. Built-in providers cannot be organized. The provider list cannot be easily searched, reordered, grouped, hidden, or favorited, so it stays long and cluttered and the providers I actually use are hard to reach.
4. Most settings still require hand-editing opencode.json. Beyond providers, the majority of settings cannot be changed in the GUI at all. This makes everyday operations awkward, makes behavior hard to discover, and leads to interaction patterns that feel anti-user.

What I'd like

• Full CRUD for providers in the desktop client: add / edit / delete / duplicate, including custom providers (base URL, API type, headers, models).
• API key management: enter / update / remove keys (masked), plus a "Test connection" button with clear success/failure feedback.
• Tools to organize the provider list: search, hide or disable built-in providers, pin/favorite frequently used ones, custom ordering.
• Move more of opencode.json into the settings UI (with an "edit raw config" escape hatch for power users), so common changes don't require leaving the app.

Environment

• OpenCode desktop client on Windows

Related (non-duplicate) issues / discussions

• [DISCUSSION] Settings: order, priority and clarifications for agents, models, variants and providers #61115 — Settings: order, priority and clarifications for agents, models, variants and providers
• [FEATURE]: Could you add action of changing the BASE URL and Console API URL in Providers? #52218 — Change the BASE URL / Console API URL in Providers
• desktop: Models/Providers dialogs cannot be scrolled (mouse wheel and arrow keys dead, no scrollbar) #50175 — desktop: Models/Providers dialogs cannot be scrolled
• [FEATURE]: Add a native V2 replacement for provider model filtering #49986 — Native V2 replacement for provider model filtering

Provider/settings management is one of the highest-friction parts of the current desktop client. A first-class GUI for it would remove most of that friction. Thanks for considering!