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docs: document Claude SDK model info investigation findings

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Investigated @anthropic-ai/claude-agent-sdk types and found that actual
model info is exposed in two places:
1. SDKSystemMessage (init) has `model` field
2. SDKResultMessage has `modelUsage` with model names as keys

Current implementation ignores both, only using config.model.
Added implementation task to capture actual model from init message.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Mohamed Boudra
2025-12-21 16:34:48 +00:00
parent 67fba8e96f
commit 845a2120ee
1 changed files with 21 additions and 1 deletions
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plan.md
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@@ -78,10 +78,21 @@ Hard requirement: We must get the actual runtime model, not just echo back the r
---
- [ ] **Investigate**: Check if Claude SDK exposes actual model in response/stream metadata.
- [x] **Investigate**: Check if Claude SDK exposes actual model in response/stream metadata.
- Look at `@anthropic-ai/claude-agent-sdk` types for model info in responses
- Check if `query()` returns model information
- Document findings for implementation task
- **Done (2025-12-21 13:15)**: YES, the Claude SDK exposes actual model info in TWO places:
1. `SDKSystemMessage` (subtype: "init") has `model: string` field (sdk.d.ts:334)
2. `SDKResultMessage` has `modelUsage: { [modelName: string]: ModelUsage }` (sdk.d.ts:299-300)
- Current implementation ignores both - only uses `config.model` (claude-agent.ts:712)
- Fix: Update `handleSystemMessage()` to capture `message.model` as `lastOptionsModel`
- Alternatively: Extract model name from `modelUsage` keys in `SDKResultMessage`
- [ ] **Implement**: Capture actual model from Claude SDK init message.
- In `handleSystemMessage()`, set `this.lastOptionsModel = message.model`
- This gives us the actual model the SDK selected (not just our config)
- Simpler than parsing modelUsage, same result
- [ ] **Test**: Verify current Codex runtime model detection works.
- Create a Codex agent with default model
@@ -111,3 +122,12 @@ Hard requirement: We must get the actual runtime model, not just echo back the r
- Ensure back button works properly when navigating agent hierarchy.
- Add implementation tasks based on findings.
- Add another **Plan** task at an appropriate position to re-audit after some progress.
- [ ] agent=codex **Review**: Code quality and types review.
- Review all changed files for code quality issues.
- Check TypeScript types are correct and complete.
- Look for any type errors or unsafe casts.
- Check for proper error handling.
- Add fix tasks for any issues found.
- Add another `agent=codex **Review**` task after fix tasks to verify fixes.