# Review: AD-666 Agent Sensorium Formalization

**Prompt:** `prompts/ad-666-agent-sensorium-formalization.md`
**Reviewer:** Architect
**Date:** 2026-04-27 (revision 2)
**Verdict:** ✅ **Approved — ready for builder.**

Previous review (2026-04-27) flagged typed-config bypass and missing SEARCH anchors. Both resolved.

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## Required (must fix before building)

_None._

## Recommended (should fix)

1. **`getattr(self, '_runtime', None)` and `hasattr(rt, 'config')`** still present in `_track_sensorium_budget`. These are defensive against agents constructed in tests without a runtime. Acceptable, but consider documenting the test-vs-prod distinction or extracting a `_runtime_config()` helper to make the test path explicit.
2. **No tracker section** (PROGRESS.md / roadmap / DECISIONS).
3. **Threshold default of 6000 chars** — confirm against typical observed sensorium sizes once shipped; the prompt should note the source of this number (current measured baseline, not a guess).

## Nits

4. **`SensoriumLayer` enum placed at module level** is correct; the prompt is explicit. Verify the import location (top of file with other constants) doesn't conflict with existing module-level enums.
5. **`SENSORIUM_REGISTRY` ClassVar** with explicit docstring on subclass extension via `__init_subclass__` — good. Add a test that verifies subclass extension behaves as documented.
6. **No "Do not build" section** — add: "do not rename or move existing injection methods", "do not add per-method tracking (future AD)", "do not block the LLM call when budget exceeded".
7. **Section 6 ordering documentation** lives in `_build_user_message` docstring. Consider also dropping a one-line reference in `docs/architecture/` so it survives docstring rewrites.

## Verified

- ✅ **Acceptance Criteria block present** with test count (12 tests) and Engineering Principles compliance line.
- ✅ **Typed config access.** `rt.config.sensorium` is read directly; `getattr` is only used to handle the no-runtime test fallback (with hardcoded threshold), not to bypass typing.
- ✅ **`SensoriumBudgetExceededEvent` typed dataclass** added matching the `CounselorAssessmentEvent` pattern.
- ✅ **SEARCH/REPLACE blocks throughout** — Section 4 (events), Section 5 (config), Section 6 (docstring), and the cognitive_agent.py call site are all anchored on actual current text.
- ✅ **`ClassVar[dict[str, tuple[str, str]]]`** with explicit subclass-sharing docstring — addresses prior concern about per-subclass override behavior.
- ✅ **Three-layer taxonomy (proprioception/interoception/exteroception)** documented inline in the registry as comments — registry IS the documentation per Single Source of Truth.
- ✅ **Log-and-degrade philosophy** explicit: "Never blocks the LLM call — this is observability only."
- ✅ **Test plan covers** registry shape, layer enum, all-methods-exist, budget tracking, event emission, threshold behavior.
- ✅ **Section 6 injection ordering audit** documents all three prompt paths (chain, DM, WR) without changing code — addresses scope discipline.
- ✅ **`_track_sensorium_budget` returns total_chars** so callers can use the return value (not just a side-effect).
- ✅ **Out-of-scope section explicit** — no method renaming, no new content, no ordering changes.

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## Recommendation

Ship. Recommended items are polish; the substantive concerns from the prior review are fully addressed.
