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+# Architecture Checklist: AI Tool Layer
+
+**Created**: 2026-05-19
+**Feature**: 225-ai-tool-layer-architecture
+
+## System Architecture
+
+- [x] Does not break any existing core functionality.
+- [x] Fits within the described boundaries of ADR-023A and ADR-025.
+- [x] Maintains isolation: AI Tool Layer does not directly access database, uses Domain Services.
+- [x] Correctly implements Server-side intent routing.
+
+## Security (CASL & Audit)
+
+- [x] Every tool function enforces CASL rules using `CaslAbilityFactory`.
+- [x] Audit logs are written for every tool execution.
+- [x] ADR-019 check: No `id: number` exists in `ToolCallResult` data payloads.
+- [x] No side effects (writes) allowed unless explicitly modeled and protected (Read-only predominantly for V1).
+
+## Observability
+
+- [x] All tool layer failures log the exception details to the server logs.
+- [x] The `ToolCallResult` returns user-friendly messages for failures without leaking technical details.