jarca-ledger-mcp/docs/batches/bat-014_20260703_adapter-surface-narrowing-baseline-refresh/design.md

# BAT-014 Design

## Architecture summary
- `adapters/mcp/tool_contracts.py` becomes the MCP adapter’s narrow contract dependency surface.
- `adapters/streamlit/{overview,assets,transactions,categorization,imports,accounts,transfers,reconciliation}_gateway.py` expose page/domain-sized call sets.
- `adapters/streamlit/service_gateway.py` remains a compatibility aggregator while `dashboard/app.py` shifts to page/domain gateway aliases.
- Baseline docs record the post-Phase-7 structure and runtime flow.