# Review by Andrej Karpathy (Round 1)

Here's my review as Andrej Karpathy:

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## Review Summary

**All 929 tests pass. All 7 functional requirements from the PRD are implemented.**

The implementation is clean and well-designed. The core insight — use the SDK's native `resume` mechanism rather than building custom transcript replay — is exactly right. The total real logic is ~15 lines of state management threading `session_id` through 3 layers (agent → direct_agent → closure state), with parallel paths for both TUI and CLI REPL.

### Key Strengths
- **Uses the model correctly**: The "always resume when a session exists" approach is superior to building a follow-up classifier. The model's attention handles irrelevant prior context gracefully; `/new` is the explicit escape hatch
- **Clean fallback**: If resume fails (expired/corrupt session), silently retry fresh — never surface session infrastructure to users
- **Correct state machine**: Session ID is cleared on every mode boundary (pipeline runs, review-only, `/new`), so there's no way to leak stale context
- **Thorough testing**: 22 new tests covering agent layer threading, fallback retry, state clearing, and end-to-end flows

### Minor Concern
- The TUI `/new` detection uses string matching (`"Conversation cleared" in command_output`) rather than a structured signal — slightly fragile but adequately tested and co-located

VERDICT: **approve**

FINDINGS:
- [src/colonyos/agent.py]: Clean conditional kwargs pattern for SDK resume — correctly avoids setting continue_conversation when not resuming
- [src/colonyos/cli.py]: Fallback retry on resume failure is the right UX — silently start fresh, never surface session infrastructure to users
- [src/colonyos/cli.py]: String-based "/new" detection is slightly fragile but adequately tested
- [src/colonyos/cli.py]: Session state machine is correct — no path leaks stale session_id across mode boundaries
- [tests/]: 22 new tests provide thorough coverage of resume threading, fallback, state clearing, and end-to-end flows
- [cOS_tasks/]: Task checkboxes not marked complete (cosmetic)

SYNTHESIS:
This is a textbook example of using the model's native capabilities instead of fighting against it. The SDK already has session resumption — the implementation just wires it through. The "always resume, let the model handle irrelevant context" design is correct; trying to build a follow-up classifier would be worse than useless. The `/new` escape hatch provides explicit user control. Clean, minimal, ships the smallest thing that works. Approve.