While running any_type_componentization_20260621, the Tier 2 agent
performed a partial code-path audit + code normalization pass that
wasn't in the original scope. This handoff document frames:
1. What was done (48 of 89 fat-struct sites promoted; 41 deferred)
2. The 5-pattern Any-type taxonomy (Patterns 3/4/5 correctly preserved;
Patterns 1/2 promoted to dataclass/registry)
3. Recommended adjustments for code_path_audit_20260607:
- Instrument the 89 fat-struct sites with hot/cold/init path tags
- Compare pre/post refactor cost for the 48 promoted sites
- Rank the 41 deferred Phase 3 sites by hot-path frequency
- Report per-call cost deltas in microseconds
4. What was NOT done (no runtime profiling; no pre/post benchmarks)
5. Decision points for Tier 1 (merge / reject / cherry-pick)
6. The bigger vision: AI/LLM frontend debugger (rad-debugger analog)
requires typed ProviderHistory, ToolSpec, Session, WebSocketMessage
to step through the agent loop without losing type fidelity
Recommendation: Don't merge this branch yet. Let code_path_audit_20260607
use it as a reconnaissance warm-up; drive the next refactor track from
the audit's per-action cost data.
The 4 newly-promoted dataclasses (mcp_tool_specs, openai_schemas,
log_registry.Session, api_hooks.WebSocketMessage) are the typed-state
foundation that the future debugger UI will read from. The 41 deferred
Phase 3 sites are the last gap: per-turn history manipulation in
src/ai_client.py needs typed state before the debugger can step
through the agent loop losslessly.
Length: 7 sections, 7 paragraphs of Tier 1 decision framing.
Location: docs/handoffs/HANDOFF_CODE_PATH_AUDIT_FROM_any_type_componentization.md
(new directory; complements docs/reports/ which is for reports vs
handoffs which are cross-track input artifacts).
