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Investigate Claude agent garbled text bug - app-side analysis complete

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Investigation findings:
- Added debug logging to appendAssistantMessage to trace state transitions
- Reproduced bug with Playwright MCP on running Claude agent
- Client-side state management works correctly
- Root cause: Server sends incomplete text chunks to client

The app-side code is NOT causing the garbled text. The issue is
server-side in the Claude agent streaming implementation.

See REPORT-garbled-text-bug.md for full analysis.

🤖 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
2025-12-25 20:00:29 +07:00
co-authored by Claude Opus 4.5
parent d107ba0f0c
commit 5e041c47a3
2 changed files with 86 additions and 0 deletions
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plan.md
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@@ -81,6 +81,22 @@ Build a new Codex MCP provider side‑by‑side with the existing Codex SDK prov
## Tasks
- [x] **BUG (App-side)**: Claude assistant text garbled in React Native app rendering.
- **Done (2025-12-25 21:45)**: Investigated with debug logging and Playwright MCP. **App-side code is NOT the cause.** See `REPORT-garbled-text-bug.md` for full analysis.
**INVESTIGATION SUMMARY**:
1. Added debug logging to `appendAssistantMessage` - state transitions are correct
2. Reproduced bug via Playwright MCP on `localhost:8081`
3. Console logs show chunks received by client are already incomplete (e.g., " a" + "check error" instead of " a" + "type" + "check error")
4. Client-side Zustand state updates work correctly - no race condition
5. FlatList renders `item.text` directly - no manipulation
**ROOT CAUSE**: The server is sending incomplete text chunks to the client. The E2E test passes because it tests NEW agent creation; the bug appears in LONG-RUNNING agents during streaming.
**NEXT STEPS**: Investigate server-side Claude agent streaming (NOT app-side):
- `packages/server/src/server/agent/providers/` - Claude agent streaming implementation
- Add server-side logging to compare Claude API output vs what's sent to clients
- [x] **BUG**: Claude agent assistant text is garbled/corrupted during streaming.
- **Done (2025-12-25 20:15)**: Added E2E test `daemon.e2e.test.ts:1760-1881` that verifies server-side streaming text integrity. **Test passes** - server sends clean, non-corrupted text chunks. The bug is NOT on the server side.