docs: update CHANGELOG.md for v12.2.1

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-19 12:02:16 -07:00
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@@ -4,6 +4,28 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [12.2.1] - 2026-04-19
 ## What's Fixed
 ### Break infinite summary-retry loop (#1633)
 When the summary agent returned `<observation>` tags instead of `<summary>` tags, the parser rejected the response, no summary was stored, the session completed without a summary, and a new session was spawned with ~5–6 KB of extra prompt context — repeating indefinitely.
 **Three layers of defense (PR #2072):**
 - **Parser coercion** — when a summary is expected, observation fields are mapped to summary fields (title → request/completed, narrative → investigated, facts → learned) instead of discarding the response.
 - **Stronger prompt** — summary prompts now include an explicit tag-requirement block and a closing reminder so the LLM is much less likely to emit observation tags in the first place.
 - **Circuit breaker** — per-session counter caps consecutive summary failures at 3; further summarize requests are skipped until a success resets it. Explicit `<skip_summary/>` responses are treated as neutral, not failures.
 **Edge cases handled:**
 - Empty leading `<observation>` blocks fall through to the first populated one.
 - Empty `<summary></summary>` wrappers fall back to observation coercion.
 - Multiple observation blocks are iterated via a global regex.
 Full details: #2072
 ## [12.2.0] - 2026-04-18
 ## Highlights