fix(model-resolver): respect UI model selection in agent initialization

[ghtndl]

• Add uiSelectedModel parameter to resolveModelWithFallback()
• Update model resolution priority: UI Selection → Config Override → Fallback → System Default
• Pass config.model as uiSelectedModel in createBuiltinAgents()
• Fix ProviderModelNotFoundError when model is unset in config but selected in UI

Summary

• Fix Sisyphus and other agents ignoring UI model selection when model is not set in config
• Prevent ProviderModelNotFoundError crash when user selects model in OpenCode UI but config has no model override

Changes

• src/shared/model-resolver.ts: Add uiSelectedModel parameter to ExtendedModelResolutionInput type and resolveModelWithFallback() function. UI selection now takes highest priority (Step 1) in model resolution chain.
• src/agents/utils.ts: Add uiSelectedModel parameter to createBuiltinAgents() and pass it to all resolveModelWithFallback() calls for Sisyphus, Atlas, and other agents.
• src/plugin-handlers/config-handler.ts: Pass config.model (OpenCode's active model including UI selection) as uiSelectedModel to createBuiltinAgents() and Prometheus model resolution.
• src/shared/model-resolver.test.ts: Add test cases for UI model selection priority, including edge cases for empty/whitespace values.

Screenshots

N/A - Backend logic change, no UI modifications.

Testing

bun run typecheck
bun test model-resolver
bun run buildManual testing:

1. Start OpenCode with oh-my-opencode plugin
2. Select a model in OpenCode UI (e.g., opencode/some-model)
3. Do NOT set model in oh-my-opencode.json config
4. Send a message - Sisyphus should now use the UI-selected model instead of throwing ProviderModelNotFoundError

Related Issues

#959

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Summary by cubic

Fixes agents ignoring the model chosen in the OpenCode UI by making UI selection the top priority. Prevents ProviderModelNotFoundError when config has no model.

• Bug Fixes
  • Added uiSelectedModel to resolveModelWithFallback and createBuiltinAgents.
  • Updated resolution order: UI selection → config override → provider fallback → system default.
  • Passed OpenCode’s active model (config.model) as uiSelectedModel for Sisyphus, Atlas, and Prometheus.
  • Added tests for UI priority and empty/whitespace edge cases.

^{Written for commit 01dd899. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA. Thank you! ✅
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[ghtndl]

I have read the CLA Document and I hereby sign the CLA

[cubic-dev-ai]

No issues found across 4 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.