# Review: AD-669 Cross-Thread Conclusion Sharing

**Prompt:** `prompts/ad-669-cross-thread-conclusion-sharing.md`
**Reviewer:** Architect
**Date:** 2026-04-27
**Verdict:** ✅ Approved with minor cleanup.

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## Required (must fix before building)

_None._

## Recommended (should fix)

1. **Edits to `cognitive_agent.py` use prose ("post chain execution") rather than SEARCH/REPLACE.** Pin the exact insertion points with anchored blocks. The chain execution path has multiple exit points — be explicit about which one(s).
2. **`max_age_seconds: float = 1800.0`** as a method-default argument duplicates the config knob. Either remove the parameter (always read from config) or document that the parameter is for testing override only.
3. **`record_conclusion` silently returns on empty summary** — that's reasonable, but log at debug level so dropped conclusions are observable.

## Nits

4. **`ConclusionEntry.summary` capped at 200 chars** via `[:200]` slice. Move to a constant or config field; mid-string truncation may produce ugly UTF-8 edge cases — consider `textwrap.shorten`.
5. **`relevance_tags: list[str]` default factory** — already correct (`field(default_factory=list)`). Verified.
6. **No "Do not build" constraints.** Add: "do not implement multi-round conclusion negotiation", "do not propagate conclusions across agent boundaries (that's federation)".
7. **No acceptance criteria with Engineering Principles compliance line.**

## Verified

- **Clean dataclass design** — `ConclusionType` StrEnum + `ConclusionEntry` with correlation_id linking back to AD-492 is the right pattern.
- `deque(maxlen=max_conclusions)` — bounded by construction, no memory leak.
- `get_active_conclusions(exclude_thread=...)` correctly excludes the calling thread to prevent self-referential context pollution.
- 14 test target is reasonable for the surface area.
- Three-file change set is appropriately scoped.

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## Recommendation

Ship after the SEARCH/REPLACE anchoring (item 1). The cognitive design (one-line conclusions in shared deque, sibling threads see them via context injection) is elegant and avoids heavy coordination machinery.
